[From the U.S. Government Printing Office, www.gpo.gov]
DRAFT Coastal Dunes Dune Building Processes and A Primer for Dune Development and Management Prepared by Dr. Norbert P. Psuty Erica Spence New Jersey's Shoreline Future Project Marinc and Coastal Sciences Institute of Rutgers - The State University of New Jersey Coastal Hazard Management Plan Office of Land and Water Planning New Jersey Department of Environmental Protection 1996 COASTAL DUNES Dune Buildincr Processes A Primer for Dune Development and Manacrement IN, 'h 7 Coastal.Hazard Mana(yement Plan New Jersey Department of Environmental Protection Institute of Marine and Coastal Sciences Rut-ers the State University of New Jersey SLImmer, 1996 DRAFT Coastal Dunes Coastal dunes are natural fecatures of the coastal landscape. They exist in conJUnCtiOn with the beach and are part of the sand sharing system that actively cxchanges sand between the dune, tile beach, and the offshore bars. In areas of adequate sand supply. the coastal duties achieve their full fOrm. however. if sand Supply IS limited. the dunes may be small. narrow features that are Frequently overwashcd. In areas of very meager sand supply. tile duties will not exist. Coastal dunes occupy a transitional zone between marine and continental processes, and mark tile eastward location of the continental vegetation. Coastal duties occupy an ecological niche that is the transition between tile harsh. salty. open environment of the beach and the less harsh protected environment to tile lee of tile dune crest. Natural dunes are replete with hollows and knolls. ridges and swales. blowouts and vegetated slopes. The location and dimensions Of dunes on the profile are related to the developmental history of the shoreline. That IS, Linder accreational conditions, older dunes are stranded inland and are succeeded by newer foredunes created in tile upper beach. At erosional shorelines. the active dune form shifts inland as the beach retreats. As long as sufficient sand is present, the dunes will exist at the Inland nianun ofthe beach. However,if the erosion is too severe, or there I'S no space for tile dune to shift Inland as tile shoreline erodes. the dUnes will not persist. In developed coastal Zones. coastal dunes continue to perform their natural function Lis sand storage. but also provide art additional role of forming a natural barrier to storm surge and flooding. Thus, dunes are valued by the coastal communities because they offer a natural. esthetic. Lind protective component of the coastal landscape. Although duties have been recognized as a form of coastal protection since tile early 1930's. it was not until 1984 that coastal communites and the State took an active role in restoring. repairing. and maintaining tile dunes. Throuoh these efforts. tile public value of the coastal foredune as a barrier against coastal storm Surges and waves has been established and continues to increase. Concern for the creation of coastal duties as part of a management program to provide protection for tile people and communities Inland from tile beach was well-expressed in tile New Jersey Department of Environmental Protection's (NJDEP) 1984 Assessment of Dune and Shore Protection Ordinances in New Jersey. which forms a basis for the present guidebook. Because the preservation and restoration of' coastal (tunes can be almost entirely a communitv effort and responsibility. this guidebook is geared towards assisting them understand dune processes and establish effective dune management programs. It provides guidance to communities as they develop strong dune maintenance programs to restore, to repair, and to enhance their duties. The guidebook also describes the processes which govern New Jersey's coastal duties. and offers management strategies directed at the communitv level to maximize tile function and effectivcness of' their (tunes. Lastly, the document includes a model ordinance which communities can adopt or incorporate into existing dune maintenance activities. 1 DRAFT Attributes of Coastal Dunes Understanding the processes that influence the creation of coastal duties is all important aspect of their management. Coastal dunes are part of the natural beach systern. Whereas dunes in drv sandv areas are enlarged shaped by wind, duties In the coastal zone are molded by waves and wind. In a beach profile. the coastal dune forms a ridge of sand that accumulates above the high tide line and Inland of tile extremely mobile, bare sand beach surface (Figure 1). SECONDARY PRIMARY DUNE DUNE 100 feet .............................STORM TIDE dune free sand beach MEAN HIGH WATER base berm Figure 1. Dune/beach Profile This natural feature exists in the Zone Where pioneer vegetation traps sand transported inland from the beach primarily by wind action, and forms an accumaulation in the shape of a coast parallel sand ridge. The active coastal dune,often referred to as the foredune to distinguish it from other and older dune forms is located immediately inland of the bare sand beach. Other older dunes may exist inland from the fordune. They may have been part of former foredunes, or they may be older sand ridges that have migrated inland from the beach. They are usually referred to as secondary dunes whereas the active foredune is the primary dune. It is the coastal fordune that is the subject of most of the remainder of this discussion. Unless otherwise noted, reference to the dune means the foredune, the primary dune in the beach/dune interactive system. The principal attributes of natural coastal foredunes are that they are sites of sediment accumulation and storage. They exist because more sand is deposited in their locations than is removed. As a result, they become a physical form with height, width, and mass. The fordune is in dynamic inteaction with the beach and the processes that move sand in the beach, including waves, currents, and winds. Certain types of vegetation can tolerate the harsh conditions of heat, aridity, high salinity. and low nutrient availability found at the shore. These plants are referred to as pioneer plants and comprise the dune grasses and other plants that colonize the seaward face or crest of the foredunes. These primary plants are the natural foundation for the creation of dunes. When airborne sand moves across their foliage, the wind's velocity is decreased, and sand is deposited around the vegetation, beginning the natural cycle of dune formation. As the sand accumulates around the primary vegetation, roots and rhizomes spread from which new plants grow. This dense vegetation anchors the dune below the surface and stabilizes sediment on the surface providing a natural barrier to incoming waves. Without the presence of dune vegetation, dunes become extremely vulnerable to the forces that create them. Natural coastal foredune development occurs inland of the frequent storm tide position where it is beyond the part of the beach that is constantly changing with the tides 2 DRAFT and wave variation. Foredune development also occurs in this zone because it is the area where vegetation can persist. Generally, the coastal foredune is not located seaward of the pioneer vegetation line, because there is a lack of a stabilizer to accumulate sand transported inland from the beach. On accreting shorelines, the pioneer vegetation extends seaward from the dune face and eventually establishes seaward to the storm tide line of the beach. This accreational situation gives rise to a series of low small ridges (Figure 2). However, most of New Jersey's beaches are eroding, and the seaward edge of the foredune is located extremely close to the storm water line and is frequently attacked by waves. On many beaches that have a long history of erosion, the foredune continues to exist in the beach/dune profile. This is an indication that under some conditions, the fordunes can migrate inland as the beach erodes. In other words, dunes can exist as the eroding beach profile is losing sand to offshore and alongshore locations. Theses foredunes ar ecapable of migrating because some of the lost sediments are transported back into the dunes during levels of high water, storm surges, and high wind. Additionally, the existence of dunes on an eroding shoreline indicates that sand is being blown into the dunes, and is carried inland to the lee side of the foredune, adding some mass to the backdune even as it is losing sand on the seaward side. After a storm, it is common to identify sand that has been transported into the dune and the swales inland of the foredunes, and to see fresh layers of sand blown atop of the foredune blanketing much of the vegetation(Figure 3). Although the coastal foredune accumulates sand blown across the beach into the pioneer vegetation, it also loses sand when wave action erodes the beach and attacks or scarps the foredune. Scarping by waves is the process by which the sand held in storage in the fordune is returned to the beach for subsequent transfers offshore, alongshore, or to its original location in the dune profile(Figure 4). If the amount of sand lost by waves scarping the seaward margin of the foredune is replaced later by sand moved by wind from the beach to the dune. the net effect of the exchange is in balance. The dune will obviosly lose dimension if the amount of sand removed is greater than the amount replaced. Conversely, the dune will gain in dimension if the amount of sand replaced is greater than was originally removed by the scarping process. Maintaining dense, healthy dune vegetation is one of the best means to stabilize a dune and to minimize mobilization and erosion. The foredune is a ridge, highter than the beach surface, forming a natural barrier to the inland penetration of high water from storm surges. By functioning as a barrier, dunes restrict the effects of storm waves and currents to the beach and the foredune face. While buffering the effects of these forces, sand stored in the dune is released by the mobilizing processes of waves and flowing water. Because the amount of protection is related to the mass of the dunes, higher and wider dunes will provide more buffering than lower and narrower dunes. However, the buffering effect of the coastal dune is obviously diminished when the dune crest is overtopped and eroded. Overwash may sometimes be so severe as to completely remove the dune form and transport much of the sand inland. 3 DRAFT A) Pre-storm surniner he.ich profile DUNE BEACH 13) Moderate storm crosion DUNE transfer of sediment from beach to bar I............... ...... ...... .............. BAR Severe storm erosion DUNE scarping of dune; transfer of sediment to bar BA 7qq R new accumulation on crest, D) Post-storm recovery and landward side of dune DUNE i return of sediment to the beach and dune BEACH 7 Dt Vi'_'Urc 4. Dune Scarping and Reckn-cry Process 4 N@l Me 11'kI DRAFT This discussion has focused on the processes by which natural dunes exist in the beach/dune profile and their Interaction with the waves, winds. and currents. However, most of the dune forms in New Jersey have been modified by cultural activities that both diminish and enhance the remaining forms. In a few places, some natural. or near-natural, dunes Still exist because of the absence of human interence. These dunes arc located on the northern portion of Sandv Hook, much of Island Beach State Park, northern Barnegat Light. Southern Sea Isle City, Southern Stone Harbor, the shoreline portion of the Forsythe Wildlife Refuge. and the central portion of Avalon. The dunes located at. Island Beach State Park and Avalon are important features of the New Jersey coastline because they show tile overall conditions of coastal dunes prior to tile major development of the shore (Figure 5 and 6). Likewise, these locations demonstrate that even though erosion has occurred, primary and secondary dUneS Still SUrvive. FUrthcr. they demonstrate tile variety of dune forms and dimensions that can occur within short distances of the storm tide position and the Interdependence of dUnes with beach changes and sediment budget. Rationale In 1930. the New Jersey Board of Commerce and Navigation produced a Report on the Erosion and Protection of the New Jersey Beaches. Whereas the report emphasized tile continuation of structural Solutions to reduce beach erosion, it noted that coastal dunes should be given more consideration for their protective qualities. It was not until 1972 that the attributes of coastal dunes were recognized by the passage of the Coastal Zone Management Act. Among the basic tenets that fOrmed the foundation of the Act was tile desire to protect dunes as a natural protective feature (P.I. 91-583, 1972). Under the Act, states could receive federal funding to develop and to implement the Act's objectives. For tile first time. there was a national impetus for coastal states to promote dune restoration and maintenance. However it was not until after the March 1984 storm, which destroyed much of New Jersey's dunes, that the State utilized these funds to implement the Federal Emergency Dune Restoration Program. With the availability of this federal funding. New Jersey coastal managemenqt strategy began to emphasis dunes as a preferred form of coastal protection through technical and financial support to communities for restoring. NJDEP and the New Jersey Office of Emergency Management (NJOEM), have continued to encourage community restoration. improvement. and maintenance of dunes through technical and financial support. In 1984, Th NJDEP completed an Assessment of Dune and Shore Protection Ordinances in New Jersey, an evaluation of municipalities management of coastal dunes. The report concluded that State expenditures for shore protection would be the most cost effective if they coincide with programs that protect and create dunes, and that future shore protection expenditures by the State be conditioned upon municipal adoption and enforcement of an effective dune management program(NJDEP,1984) As a by-product of the Section 306 dune restoration, NJDEP produced Guidelines and Recommendations for Coastal Dune Restoration and Creation Projects in 1985. The report was designed to "list recommended dune restoration and creation techniques. help municipalities plan effective and environmentally sound dune projects, and explain what information municipalities should submit to complete their applications for dune funds" (NJDEP,1985). The New Jersey Office of Emergency Management NJOEM) has also continued to 6 DRAFT support a coordinated government program of dune creation,and expansion through the various State Hazard Mitigation Plan's recommendations (NJOEM,1994).In addition through NJOEM. coastal communities can qualify for Hazard Mitigation Grant Program funding to restore, develop and repair their dunes after a disaster. As New Jersey's coastal management strategies shift from protection of property to the enhancement of public safety, coastal dune maintenance can easily be incorporated into these efforts. As previously stated, coastal dunes buffer the effects of storm surges and prevent subsequent damage. Therefore, the utilization of coastal dunes is consistent with both federal and state mitigation objectives. If the Federal government continues to decrease monetary support for beach nourishment projects as a type of coastal protection., the buffering abilities of coastal dunes may become the primary means of protection. Further, through dune maintenance programs such as annual beachgrass plantings, many municipalities can bring various community resourced together for a common cause, creating a feeling of community "togetherness" (Figure 7). Determining objectives If coastal dunes are employed to protect communities from the effects of coastal storms., communities must determine the level of protection they wish to achieve from anticipated storm water levels prior to constructing the dunes. When determining their objectives, communities must balance the level of protection desired with the amount of space they will need to achieve their goals. The spatial dimensions of a foredune that would protect against a 1 in 5 year storm water level for example, differ from the dimensions required to buffer a 1 in 50 year storm. Although a municipality may wish to provide protection from water levels of a 1 in 50 year storm, the dune/beach area may only provide adequate space for a foredune that can buffer a 1 in 20 year storm water level. If communities desire to develop dunes that will protect against higher magnitude storms, but do not have the desired space, they should consider rezoning the beach front areas. This zoning would allow communities to develop or expand existing dunes as space becomes available. Unless a community is willing to designate adjacent landward property as part of the dune area. limited space leads to smaller dunes that offer a lower level of protection. Although many communities preserve their dunes because of their protective capabilities, there are other attributes of coastal dunes, such as their aesthic values, that communities may wish to preserve as well. For example, the City of Brigantine incorporates into their dune protection ordinance regulations to preserve beachnesting bird habitats (City of Brigantine, 1986). When developing their strategies. municipalities should consider the other attributes of coastal dunes and incorporate objectives to enhance them. Something communities should consider when forming their objectives is the temporal component of dune preservation. Through time, the ability of coastal dunes to buffer storms is compromised by an eroding shoreline and risingt sea levels. As the shoreline erodes, unless coastal dunes are able to shift inland in relation to these changes. they will be subject to scarping and to overwash. and may eventually be completely eroded. When determining a dune's level of protection, municipalities may want ot incorporate a buffering area that will permit a coastal dunes position to be translated landward in response to the dynamic nature of the coastline (Figure 8). 7 gru U4 4@ 0 ire- '.4mv w4w.,w DRAFT foredune pioneer vegetation free sand beach HIGH WATER Figure 8. Dune Buffering Zone. Storm Template To be inserted Placement and Dimensions of a Dune Coastal dunes exist in association with their adjoining beaches. The beach is both a Source of sand and of protection from small storm events for the dune (Figure 1). Generally, a dune located 100' inland from the high tide water line on a beach with a 5' high berm will provide adequate protection against a 1-in-5-year storm. That is, the dune will not be eroded in less than these conditions. However, more severe storms will erode the protective berm and eventually erode the dune. The amount of dune erosion from a storm is dependent on the storm conditions and on the pre-storm dune cross-sectional area (dune reservoir). FEMA applies the concept of the dune reservoir to the portion of the dune that is in front of tile dune crest and above the hundred year flood level (Figure 9). Obviously, large dunes have greater cross-section and can survive larger storm events. FEMA (1995) suggests that in the event of a 100-year storm (reaching the 100-year storm water level), the dune would require a dune reservoir area of 540 ft' above the 100-year flood level to prevent overwash and to survive. Dune Plaement: Because dunes derive their sand supply from the beach, which can Undergo substantial chanoes in width through natural processes. natural dune development occurs inland of the storm tide position (Figure 1). Dunes should be placed sufficiently far enough inland from the storm tide position to provide a buffer and to protect the dunes against freqUent storms. Otherwise, the dune cart become substantially eroded during low MagnItUde storms and it will not be capable of' providing any protection against larger events. In order for a dune to provide tilts additional buffering, specific dimensions of a dune need to be maintained. Dunes that are inland of the MHT line provide more buffering and there is a greater likelihood these duties will survive less 9 DRAFT frequent storms. Dune Crest and Resevoir to prevent breach. (>50m2) ... ......... ............100 year storm surge COASTAL FOREDUNE sea level BEACH Figure 9. Dune Reservoir: The Portion Of The Dune That Is In Front OF The Dune Crest And Above The Hundred Year Flood Level Dune Height:The length of time required to reach a dune's optimum height varies with weather conditions. availability of sand. and the methods used to build a dune. Dune height Which is Influenced by the rate of sediment delivery as well as by the installation of fences and vegetation. should reach on the order of 8' to 15' above the beach. The initial accumulation and the growth may be rapid at first (Hammer et al, 1992). As dune height increases, the rate of increase of elevation slows because of vegetation and other perturbations on the dune face. Under ideal conditions, the combination of sand fencing. vegetation, and ample quantities of dry sand, dune elevation can reach up to 4' in one season (Hammer et al, 1992). Dune Slope: Althoug there is a limiting slope for the natural accumulation of sand, a number of variables combine to adjust this slope on a dune face. such as vegetation, presence of organisms. salt content, and other disturbances. One measure of the relationship of dune slope was reported by Gares. et al (1983) From a survey of' New Jersey dunes. Their StUdV Included eroding. accreting, natural dunes. altered dunes. On the basis of their surveys. they determined the New Jersey dunes were about 20 times as wide as they were high (Table I) This number also includes instances of coalescing duties and thus tends to be a bit high. Other measurements From coastal New Jersey and Long Island, NY (Psuty and Piccola.1991) show that the human-constructed dunes are about 7 times as wide as they are high. In this case. the slope would be about 1 on 3.5 (Table 2). 10 DRAFT Table 1. Dune Height/Width Regression Line. f 40.597 % 5 20 2 0 Une Height Adapted firom (lare's. P.xt a 1, (1983). 'rabic 2: Relationship Between Dune Height and Dune Width D6ne Height Dune Width 3 5 8' 56' I (), 70 1 12' 84! 14' 98 1 16' 112' Adapted Crorn PSLIIY, N.P. aridT, A. Iliccola. (1991). DRAFT Building and Enhancing Coastal Dunes Once municipalities have established their objectives and have determined that there is adequate space to achieve these goals, tile next step is to implement the construction of' dunes. There are several different techniques available to create coastal dunes. Dunes can he built by mechanical manipulation.planting, appropriate dune vegetation. erecting sand fences. or a combination of these methods. Mechanical Manipulation A simple but relatively expensive method of creating a coastal dune is by bulldozing sand into the dimensions of a dune. An advantage to this method is that dunes and their protective qualities are instantly achieved. Sources of sand for creating a dune using this technique include transferring sand from tile beach or obtaining sand from an outside source. Althouoh it may be more expensive to transport sand into the system, an advantage to this method is that additional sand will be added to an already depleted system. When creating a dune through mechanical manipulation. at least one parallel sand fence should be placed on the landward side of the dune to Create the boundaries of the dune area. In addition. a shore parallel sand fence could be erected on the seaward side of the dune to further define the dune's boundaries (Figure 10). When determining the placement of the dune, fencing should be placed slightly seaward of the dune zone because sand generally accumulates landward of the fence. It should be noted that the sediments comprising mechanically-made dunes are unstable because they are not bound together. Therefore, once the proper dimensions of a dune are established. vegetation and appropriate fencing should be planted and maintained to stabilize the dune. Dune Vegetation One of the simplest and least expensive methods used to create a dune is to plant Cape American beachgrass, (Ammophila hreviligulata) or other primary dune vegetation at adequate distances inland from the MHT (Figure 11). Unlike bulldozed dunes, this method takes some time before optimal dune dimensions are achieved. Once established, beachgrass accumulates sand to form a dune and its extensive root system helps to bind the sand in place. 'Cape' American beachgrass should be planted between October 15th and March 31st. as long as the sand is not Frozen (Hammer et al. 1992). To maximize the dune-building process, beachgrass Should be planted in continuous strips parallel to the shoreline 100'- 150' landward of the MHT line. If space permits, it should be planted in a 40' to 50' wide strip. but no less than 20' wide and in at least 10 rows. Only fresh plants that have been cut back to 16-18 inches should be planted. Two plants should be planted in 7-to-9 inch deep holes, spaced about 18 inches apart. If there is severe erosion, the spacing should be reduced to 12 inches apart. The sand Should be compacted firmly around the transplant to eliminate airpockets. Thirty days following the planting date, fertilizer Should be applied at a rate equivalent to 600 pounds of 10-10-10 nitrogen/phosphorous/potassium per acre (Hammer et al. 1992). Once established, American beachgrass will continue to grow relative to the supply of nutrients provided. With adequate sand transport into the vegetation zone, the nutrients will be delivered on the sand grains and in the propelling wind. However, if the sand supply is 12 Al J)v 5.1 I 4K p ov @ At; tz" f Eli @, @t@,j DRAFT low. nutrient delivery will likely be reduced and the vegetative Cover may become very thin. Dune orowth and stabilization are dependent on the trapping effect of tile veoctation. Obviouslv, welled vegetation will increase plant density and be a more effective .,and trap. creatinu a more stabilized dune system. III NJDEPs assessment of dune ordinances (1984), NJDET noted inanv municipalities and environmental groups had misunderstood tile dynamics of' dunes and beachgrass. III an effort to secure tile dune. sonic groups planted beachgrass on the leeward side of the dune with. little success. Because tile primary Source of nutrients for beachqurasses is derived from ocean breezes and transported sand. beachgass planted on the leeward side of tile dune does not rCCeIVC SUfF1CIcnt nutrients to Survive. Also. some areas oil the front of dunes may be deprived of'sufficient nutrients because of the absence of sand receipt. Thus. in those areas ofthe dune in which the natural Supplies ot'nutrients arc deficient. tertilization is a necessity. Sand Fences Sand f'encing is also an efflective method Ior trapping sand. Whereas sand fencinu (or now tence material) builds dunes much faster than ve0etation alone. it is still a lairly sl()NA,, process and more expensive than vcgetation alone. I lowever. sand tencing is much cheaper than mechanical manipulation: costing as little as a $1 a Coot. Sand fencing accumulates sand in the same manner as dune vegetation. As wind borne sand travels from tile beach to the backbeach area, sand is deposited and accumulates to the lee of tile fence line. As the sand. accumulates. additional fencing can be placed over the filled areas until the dune reaches a dcsired level of'protection or height. lfarnrncr el al (1992) note sand will generally only (III to I level about 3/4 ofthc depth of" the sand fence. All fences should be at least I OW frorn tile vlt--rr line and approximately at a ri-ht an-le to the prevailing winds. I larnmer et al(1992) also recommend when bLIiid1n(-,I dujICjLISt U.Sill" fencing. planting Should begin when tile sand elevation approaches the top ofthe fencc. These plants are necessary to hold the sand III place and bind tile particles togcthcr. There are several different. COnfigUrations of sand fence placement, each creating a somewhat differently-shapcd dune. The most cost-efflective type of sand fence used to create a foredune is a single line of fence that is parallel to the ocean. Hanmer el al (1992) recommend if it Is possible, that two parallel fences should be erected 30' to 40'apart instead of a single, fence (Figure 12). Parallel sand tenccs are also recommendcd to restore or to expand existing dunes and should be placed no more than 15' seaward from the base of tile old dune (Hummer et al, 1992) (Figure 13). Howevcr if the fence line is located too close to tile water. its accumulated sand will be eroded. When creating a dune, NJDFP recommends using, zig-zag or parallel fences with side spur configurations (Figure 14 and 15). These designs will initially produce wider dunes than single parallel fences and they also offer the advantage of controlling pedestrian access (NJDEP 1985). Zig-zag fences tend to produce a wide, hummocky dune. whereas side spur fences produce a larger. more rounded dune only on the side with Spur,,. Because side Spurs and zig-zag fencing requires more material. tile cost of a project is greater than single parallel fencing. Hammer et al (1992)) recommend parallel fences with 30' long perpendicular spurs at 40' intervals along, the seaward side of the fence at least 100' from the NHTq. Specifications for Sand Fence: Sand fences of various heights. material. and porosities 1 4 T5, r,-; :42 t Pop@" Vf"; rp 71-Z7 10 11-11T W, VU71S 7@ T 1@. 10 lo . . . . . . . . . . DRAFT have been studied for their effectiveness In building dunes. These studies have concluded that fences with at least a 50% porosity are the most effective in accumulating sand quickly (Hotta. Kraus, and Horlwaka. 1987, Janin. 1991). Studies have also proven that standard 4' wood slatted snow fence is also tile most effective: at trapping sand as long as the wood IS Sound. free of decay. and no wires or slats are broken (Hotta. Kraus, and Horiwaka. 1987). An alternative fence material is the polyvinyl type that has at least a 50% porosity (Hammer et al. 1992). Hammer et al ( 1992) recommend that tile wooden posts for fence support should consist of black locust. red cedar- white cedar, or other wood of equal life and strength. Posts do not need to be chemically-treated and they have a minimum length of 6.5' and a minimum diameter of 3 inches. Hammer et al ( 1992) note standard post fences are typically 7' to 8' in length and Can be used if they meet tile other requirements. The sand fence should be secured to the posts using four wire ties no smaller than 12 gauge galvanized wire. They Should be installed so that alternate posts will have fence on their oceanside (Hammer et al- 1992). Lastly. Hammer et al ( 1992) recommend the Posts Should be set no more than 10' apart and at least 3' deep to make tile fences more resistant to changes in the wind direction. Combination of Sand Fence Plus Vegetation A combination of sand fencing and beachgrass should be more effective at building a dune than either of the two alone (Figure 16 and 17). As the fence traps the sand. tile beachgrass roots secure the dune, thus trapping more windblown sand then either could alone. To employ this method. sand fencing, should be installed according to the above specifications. Strips of beachgrass should then be planted parallel to the fence. Vegetation should tic planted LIP to 10' from the fence and approximately 20' wide to be tile most effective. As the fences are covered by the sand. additional fencing can be erected to increase the elevation of the dUne (Hammer et al, 1992). Coastal Dune Restoration and Maintenance The continuation of the coherent foredune requires a rigorous maintenance program. Even the best-vegetated dunc will need attention to Support a good vegetated cover and to retain the integrity of the sand ridge. Beach grass needs to be fertilized, planted, and broken fencing needs to he replaced on a continuing program. Additionally, any blowouts or scarping of the dunes Will need to he stabilized. Dune Vegetation Replacement of vegetation is an essential maintenance requirement for healthv duties. Areas where vegetation has been destroyed should be replanted with beachgrass or other suitable primary dune vegetation at every opportunity. Maintenance fertilization for established beachgrass should at exceed 50lb. of nitrogen per acre per year (Belcher, 1986). Coastal duties represent the zone in which coastal and inland vegetation converge. forming a unique area of biodiversity. To reduce the loss pf dune vegetation through disease. environmental degradation, and other environmental, this biodiversit must be maintained. Other primary vegetation such as sea rocket, dune cordgrass, seaside goldenrod, and dusty miller are examples of suitable primary vegetation communities could plant. Since 1982 the NRCS has been cultivation new strands of sea oats which will withstand the colder climates of New Jersey in an attempt to add more diversity to the foredunes. Prior to their research. 1 7 DRAFT sea oats's range was only as far noth as Virginia (USNRCS 1996). As of 1996, despite setbacks from trampling and tidal flooding, the sea oat plantings have been a sucess (USNRCS, 1996). After primary dune vegetation has been established. woody plants adopted to coastal climates can be planted in secondary coastal dunes for added stabilization and biodiversity. Hammer et al (1992) recommends bayberry, wax myrtle, beach plum, Japanese black pine. salt spray rose, and Emerald Sea shore juniper as secondary dune vegetation. Secondary dune vegetation Should be planted in accordance with guidelines in Hammer et al ( 1992). All secondary dune vegetation requires yearly fertilization and communities should follow Hammer, et al (1992) fertilization recommendations. Appendix B lists the nurseries in the New Jersey-New York-Delaware region that supply primary and secondary dune vegetation. Preventing Indiscriminate Passage: Dune vegetation can not tolerate any trampling. Even light foot traffic can cause breakage, churning up of the roots and eventual destabilization of the dune if it is allowed to continue (NJDEP. 1984). Dune vegetation, therefore, must be protected from foot and vehicular traffic. By installing either elevated walkways or fenced paths, traffic call be controlled across the dune and access points call be limited (Figure 18). Fences can also be installed in the front and back faces of a dune as borders to further prevent indiscriminate passage. Signs should also be placed along dune areas and access points to educate and to remind tile public not to walk across tile vegetated dune areas. Pathways: Street-ends are often weak links in the coastal dune ridge, becoming sites of overwash and breaches. Therefore, the major concern when providing beach access through the dune area is to eliminate the straight-through excursion of storm waters through a street-end break in the dune ridge. NJDEP (1985) recommends that pathways be oriented on an angle to reduce the potential for overwash and reduce exposure to the storms. Offsets in the pathway or a curving pathway serve the same function in limiting overwash. Another concern is the low evelation of the pathway. Elevated cross-overs can also be installed to reduce vertical erosion of the dunes (Figure 19). If they are utilized, elevated walkways should be high enough to be above tile design height of the intended dune. Otherwise. roll-up sidewalks or some other material that can be laid on top of the sand surface to prevent vertical destruction by foot traffic should be used. Repairing Dunes Each municipality needs to establish a yearly dune maintenance and monitoring program. Any changes in a dune system such as blowouts, wash-outs, or human-induced damage need immediate attention if dunes are going to provide their maximum amount of protection. Blow-outs can easily be repaired by installing a single shore-parallel sand fence between the existing dune parts. In order to prevent the wind from whipping around the ends and causing more erosion, it may be necessary to extend the ends of the fence into the existing dune (NJDEP, 1985.) The following major coastal storm events, dunes often become scarped from storm waves. (Figure 20) Scarping is the natural process of cutting back the face of the dune as the beach is eroded. Dunes which are located too far seaward will experience scarping from storms of low 18 DRAFT magnitude (Figure 21). Although the general post-storm reaction o communities is to restore the scarped duties to their pre-storm dimensions. there may be a need to reevaluate the location of the dune area and the dune maintenance efforts. All repairs to scarped dunes should continue to observe the dune's placement of 100 from the MHT line. By keeping the dune location sufficiently Inland, the beach will provide a buffer and protective area, and reduce future scarping. However, continued beach erosion. and sea-level rise will gradually narrow the protective beachcs. Following high magnitude storms, even well-maintained dunes may experience some degree of scarping. If these dunes are Situated at the recommended minimum distance from the MHT line, the scarped dunes should be repaired by placing short perpendicular spurs into tile scarped dune followed on the seaward side by zig-zag fencing (NJDEP. 1985). After a wedge of sand begins to accumulate. American beachgrass. can be planted. Within a matter of months. the dune should have regained most of its natural profile. Establishing Dune Buffer Areas In an effort to maintain a static shoreline position, coastal dunes have often been used as a type of seawall. in an attempt to intercept waves and to prevent storm surge penetration. These management practices have often resulted in dunes being built within tile reach (if' minor storm Waves, subjecting them to frequent scarping and eventual destruction. An alternative approach to this problem is to place the dunes farthe from the water and to manage coastline in a manner that is more compatible with the natural forces that shape it. As New Jersey's coastline continues to erode due to a rising sea level coupled with sediment loss, coastal duties will be subject to increased scarping and erosion if they are not permitted to shift inland naturally and maintain a distance from the MHT. Because the basic dune processes often cause transport of sediment inland ofthe dune crest. the creation of" a buffer zone at. the inland margin of the foredune supports the inland continuity of dune processes. form. and habitat as the dune shifts inland. (Figure 22) 'Therefore,to ensure their longevity, dunes must be located a sufficient distance inland of' the line and they Should have some buffer space at their inland margin (Figure 8). However, because development has occurred either directly next to or on top of dune fields, the creation of a buffer area Is difficult. Where possible. it Is highly desirable for communities to establish a formal dune buffer area inland of tile built dune to pcrmit the inland extension of the dune processes. Practical dimensions for a dune. therefore. could consist of the following A 100 wide berm from the MHT line to the seaward toe of the dune. A 50-1 W wide dune zone. Wider dune zones Support higher dunes which provide more benefit. A buffer zone 10-30' Inland of the constructed dune which provides an area for extension of the dune's natural processes. 1 9 @;T , " - wi I OT 1, oo.v DRAFT Developing a Model Dune Protection and Maintenance Ordinance Almost every coastal community in New Jersey has adopted a dune protection ordinance (Table 3). Many of these ordinances were passed as a result of the devastating 1962 nor easter that nearly destroyed every dune along the New Jersey coastline (NJDEP. 1984). Following the storm. local governments with Federal and State support rebuilt the duties and municipalities subsequently passed ordinances to protect and preserve them. Table 3 lists each coastal municipality in geographical sequence and the date of the most recent revision of their dune ordinance. Because many of Monmouth County's beaches are not wide enough to support coastal dunes, many of the County's municipalities have not adopted dune protection ordinances. Table 3: Coastal Municipalities With Dune Ordinances Municipalities Date of Municipalities Date of Last Revision Last Revision Monmouth County Atlantic County Sea Bright No Ordinance Brigantine City 1986 Monmouth Beach No Ordinance Atlantic City 1989 Long Branch No Ordinance Ventnor City 1989 Deal No Ordinance Margate City 1991 Allenhurst No Ordinance Longport 1996 Loch Arbour No Ordinance Asbury Park City No Ordinance Cape May County Neptune (Ocean Grove) No Ordinance Ocean City 1994 Bradley Beach No Ordinance Upper Township 1975 Avon-by-the-Sea No Ordinance Sea Isle City 1987 Belmar 1992 Avalon 1970 Spring Lake 1993 Stone Harbor 1985 Sea Girt 1994 North Wildwood City No Ordinance Manasquan 1989 Wildwood Crest No Ordinance Wildwood City No Ordinance Ocean Countv Lower Township 1988 Point Pleasant Beach 1994 Cape May City 1995 Bay Head 1993 Cape May Point 1974 Brick 1988 Mantoloking 1995 Lavallette 1985 Seaside Heights No Ordinance Seaside Park 1988 Berkeley Township 1994 Barnegat Light 1994 Harvey Cedars 1989 Surf City 1972 Ship Bottom 1994 Long Beach 1994 Beach Haven 1994 Dover Township 1981 21 0 DRAFT Coastal dunes are managed and protected oil a local level. and consequently, dune ordinances differ considerably from community to community. Although municipalities created ordinances with good intentions. many of these ordinances have failed to prevent dune damage or to provide clear guidance on the proper maintenance and construction of dunes (NJDEP. 1984). NJDEP notes ( 1984) this is not entirely the fault of the ordinances. but was also due to the lack of scicntific knowledge on dune dynamics until the early 1980's. On a positive note. as further knowledge has become available, several communities have strengthened and amended tqheqir orqdinwices. As a result, their dunes provide enhanced protection from the effects of storms. The following section highlights the attributes of successful dune ordinances that have facilitated the preservation of dunes and have continued to provide safety from storm-related flooding. Definitions Defining, the parameters of what is being regulated is a significant aspect of an effective dune ordinance. Without flood definitions, what is being regulated comes into question. For example. most ordinances have legally defined dune areas (or building lines) as a static fixed line. However. dunes naturally mityrate in response to wind, water. and other elements. As a consequence of this mobility, communities may become unable to prevent construction In natural dune areas that are landward of the fixed building line. The resulting narrower dunes are consequenting unable to provide much protection from storm surge and overwash action. Because communities are unable to redelinate dune areas without the threat of a "takings" issue many communitics have not redefined the dune areas. Since the 1981 Shore Master Plan a few communities have revised their ordinances to provide a more scientifically-definod setback- line that acknowledges dune migration. Specifically Mantoloking, Bay Head and Point Pleasant use a case by case review for the Construction or renovation of residences to keep development away from the backslope of the dune. The 1984 assessment of dune ordinances by NJDEP also acknowleded Long Beach Township's attempts to define 150 wide beach-dune area district but a clause in the ordinance has allowed houses to be built upon the dunes as long as they are 20 feet behind the bulkhead line and the dune is 16 feet in height at the ocean front building line (NJDEP, 1984). Whereas many ordinanccs do provide a definition of "dune areas" they fail to recognize dunes are subject to washovers and scarping which may require immediate attention. Certain areas upon the dune zone may require different upkeep practices whether they need to be maintained, repaired. or created. The City of Brigantine recognizes these different management requirements by dividing their dune area into three different dune districts: Dune Maintenance District. Dune Reconstruction District. and Dune Restoration District City of Brigantine 1986). Although Brigantine does not specify dune maintenance requirements in the ordinance it does supplement, the ordinance with the Dune and Shoreline Management Plan, a topographical survey of the dune fields and beaches. Atlantic City is another municipality that recognizes in its ordinance that dunes migrate in response to natural forces. In the definition of the Dune Development District. Atlantic City requires the boundaries will be reviewed every twelve months, as well as following any storm which damanges large portions of the District (Atlantic City, 1989). In 1993, the New Jersey State Legislature redefined a dune when the Coastal Resources and Development Policy (CAFRA 11)(N.J.A.C. 7:7E: 3.16) was amended. Presently only a few communities have revised their definition to incorporate CAFRA 11's new definition, for example, the Township of Berkely has revised their definition as follows: DRAFT Dunes: A dune is a wind or wave deposited or man-made formation of sand (mound or ridge), that lies generally parallel to, and landward of, the beach, and between the upland limit of the beach and the foot of the most inland dune slope. "Dune" includes the foredune, secondary, and tertiary dune ridges,as well sa man- made dunes, where they exist. 1. Formation of sand immediately adjacent to beaches that are stabilized by retaining structures,and/or snow fences, planted vegetation, and other measures are considered to be dunes regardless of the degree of modification of the dune by wind or wave action or disturbance by development. 2. A small mound of loose, windblown sand found in a street or on a part of a structure as a result of storm activity is not considered to be a "dune". This definition is intended to reflect the definitions set forth in CAFRA regulations N.J.A.C. 7:7E-3.16 as it may be amended from time to time) (Berkeley, 1994). Regulation of Activities Because dune vegetation is easily disturbed by foot traffic or other activities, dune ordinances regulate all activities in the dune areas which may disturb the conditions of the dunes. Typically ordinances regulate construction, public access to the beach area, and the maintenance of dunes. Whereas every dune ordinance regulates these activities to some degree, some municipalities ordinances are more effective at preventing dune degradation. Construction on the dune itself is prohibited by every community. The only exceptions are shore protection projects such as the construction of bulkheads, jetties, or groins approved by NJDEP. US Army Corps of Engineers, or the municipality. Mantoloking and Brick have added a clause that if any of these projects impede on the natural flow of sand supplementing the dunes, they will not be permitted (Mantoloking, 1995 & Brick, 1988). In the 1984 assessment of dune ordinances, NJDEP concluded municipalities that permitted the use of brush type fencing (trees or shrubs) as a means of trapping sand had unintentioinally transformed dune fields into dumping grounds. As a result of this finding, many communities climinated this form of sand fence from their ordinances. However, several communities still allow dead trees and other shrubs to be used as drift fences. Almost every community restricts public access over dunes to prevent the destruction of dune vegetation or the lowering of dune height. However only a few communities have addressed the problem of overwash into street-ends through walkways during period of high water. Mantoloking and Bay Head recommend the use of elevated walkways for both public and private access to the beach. Ocean City also tries to prevent overwash by recommending pathways should be constructed as zig-zag pathways angled to the southeast or whatever direction is at a right angle to the approaching waves in the area (Ocean City, 1994). In addition, many commutes are now putting an artifical surface on pathways, such as roll-up side walks, plastic mats, or cordgrass to prevent the vertical destruction of the dune. Dune Maintenance One of the purposes of dune ordinances is to achieve the maintenance of dunes at a height which will provide protection from the effects of storms. Most dune ordinances do not permit the lowering of dune height either through direct or indirect action of a person below an elevation deemed by the community. Only a few municipalities state directly in 23 DRAFT their ordinance the ideal height of dunes above Mean Sea Level. Bay Head recommends 16 feet as its ideal dune height (Bay Head, 1993). Whereas Mantoloking (1995) states the minimum height of 18 feet at the prevailing dune crestline and Long Beah (1994) recommends a minimum height of 16 feet. It should be noted the NRCS recfommends the height of dunes should be between 12 to 16 feet (Hammer et al. 1992). Further the NJDEP (1984) assessment of municipalites dune ordinances found many communities failed to give clear guidance to either the municipality or private owners on the maintenance or growth of dunes. Mantoloking, Ocean City, Point Pleasant, Dover, Berkeley, and Brigantine are some of the communities that mandate specifications for the yearly maintenance of dune vegetation. The appendix to Mantoloking's 1995 ordinance is adopted from the NRCS 1992 Restoration of Sand Dunes Along the Mid-Atlantic Coast and is also a good reference for dune maintenance. Conclusion Communities benefit form the preservation and enhancement of coastal dunes. which are an important component of the natural coastal system. Although dunes are valued for their function as a natural barrier, there are many other roles and functions of dunes. By acting as a natural sand storage area for the sand sharing system, coastal dunes actively exchange sand within this system. Additionally, coastal dunes provide a habitat for diverse plant live and offer various exthetic qualities. Standardized procedures that assist in the general maintenance and enhancement of coastal dunes can be developed on a community level. Dune protection ordinances provide a legal mechanism for communities to develop programs that maximize the function and effectiveness of dunes. It is important that these ordinances reflect the objectives of the community's dune presercation's efforts. Whereas there is considerable interest in the creation of coastal dunes as part of a community effort, it must be stressed that dunes do not prevent erosion and they do not reverse an erosional trend. They do offer protection from storm surge and they do contribute sand to buffer the rates of shoreline displacement. Thus, dunes act as a barrier to communities and reduce storm-related damage. However, the dunes have a finite capacity to provide protection and buffering. They may be eroded and overwhelmed by waves and winds. They may be topped by very high stom surges. Although communities can extend the protective capabilities and other qualities of dunes through maintenance programs, it is likely that dunes should be considered as a short-term protective strategy that is within the capabilities of the community to perform and that will have to be repeated at some time interval. Acknowledgments MS. Marianne Shaffer, contributed greatly to an early draft of this document and the collection of dune ordinances. Mr. Jason Tsai, produced the storm/beach templates. Much of the information on the National Resoucce Conservation Service were contributed by Mr. Chris Miller. NRCS, Somerset, NJ. All of the various dune protection ordinances were supplied by Township clerks. A special note of appreciation is extended to all the members of the Citizens Advisory Committee who collected the dune ordinances. Figures and graphs were prepared by Michael Siegel, IMCS Cartography Lab, and Michael Padula. Bibliography 24 DRAFT Atlantic City. City of (1989). Article VII: Beach Protection Code (Ordinance # 22- 1989). Atlantic City, NJ: City of Atlantic City. Bay Head. City of(1993). Ordinance 1993-8: Dune and Beach Regulation. Protection and Preservation. Bay Head, NJ: Borough of Bay Head. Berkeley Township ( 1994). Ordinance #94-40-oab: Beach Protection Amendment. Berkeley, NJ: Berkeley Township. Belcher, C. (1986). Fertilization of American Beachgrass on Sand Dunes. Somerset. NJ: NE PMC. Board of Commerce and Navigation. (1930) Report on the Erosion and Protection of the New Jersey Beaches. Trenton, NJ. Brick Township of (1988) Chapter 134:Dune Preservation Ordinance. Brick, NJ: Township of Brick. Brigantine, City of. (1986) Ordinance #7 of 1986: An Ordinance Modifying Ordinance # 28 of 1981. Brigantine, NJ: City of brigantine. Gares, P.K. Nordstrom and N. Psuty. ( 1982). Coastal Dunes: Their Function, Delineation. and Management. Trenton. NJ: NJDEP. Hamer, D. Cluster B. and C. Miller (1992) Restoration of Sand Dunes along the Mid- Atlantic Coast. Dept. of Agriculture: Sumerset, NJ. Hotta S., Kraus, N.,and Horiiwaka M.A., (1987) "Function of Sand Fences in Controlling Wind-Blown Sand". Coastal Sediments '87. 1, pp. 772-787, Janin. L. F. (1987). "Simulation of sand accumulation and fences."Coastal Sediments. 202-212. Long Beach Township (1994). Ordinance #94-16C. Long, Beach. NJ: Long Bcach Township. Mantoloking. City of. (1995). Ordinance #348: Beach and Dune Protection.Mantoloking, NJ: Borough fo Mantoloking New Jersey Department of Enviromental Protection (1985). Guidelins and Recommendations for Coastal Dune Restoration and Creation Projects. Trenton, NJ: NJDEP. New Jersey Department of Environmental Protection (1984). Assessment of: Dune and Shore Protection Ordinances in New Jersey. NJDEP: Trenton New Jersey Office of Emergency Management (1994) Hazard Mitigation Plan for New Jersey DR-973-NJ. Trenton, NJ: State of New Jersey: Office of Emergency Management. New Jersey State Legislator (1993). P.L. 1993 c. 190 CAFRA. Trenton, NJ office of Administrative Law. Ocean City, City of.(1994) Beachfront Construction and Maintenance Plan. Ocean City, NJ: City of Ocean City. Psuty, N.P. and Piccola, T.A. (1991). Foredune Profile Changes, Fire Island. New York. Rutgers University: Institute of Marine and Coastal Sciences, 39 pp. Psuty, N.P. ed. (1988). Dune /Beach Interaction Journal of Coastal Research Special Issue No. 3 pp 136. U.S. Natural Resource Conservatin Service (1996). Initial Evaluation of Sea Oats (Uniola Paniculata)Somerset, NJ: Soil Conservation Service. U.S. Natural Resource Conservation Service (1995). Plant Source from Cape May PMC. Cape May. NJ: Soil Conservation Service. 25 DRAFT Appendix A: Model Coastal Dune Protection Ordinance Dune ordinances provide a legal mechanism for communities to establish and maintain certain levels of public safety from the effects of coastal storms. By adopting strong dune ordinances. communities can develop dune maintenance programs which preserve, restore. and enhance their dunes. The following model dune ordinance was created from existing dune oridances to assist communities reassess and create these dune protection ordinances. Anything italicized is a change to an original ordinance; otherwise the muncipality is noted. 1. Purpose: I . Although there may be no economical long-term defencse for fixed oceanfron structures against a constantly rising ocean level and a decreasing sediment supply , there are methods of effective protection of the ocean front and adjacent coastal areas in the short and middle term against oceanside storm surges and flooding. A well-develope dune system provides elevation and breadth to create a level of safty from the effects of the ocean and related hazards. A well- developed, coherent coastal foredune will provide an uninterrupted storm surge barrier and a source of sand to mitigate the effect of the storm waves for the benifit of the entire town, island as well as oceanfront properties. Accordingly, the borough has a vital interest in the continued maintenance and protection of the ocean beach and dune areas and has the right to cause their restoration in the event of damage or destructino.(mantoloking) 2. Occan and bayfront dunes are dynamic valuable physical features of the natural environment possessing outstanding geological, recreational, scenic. and protective value. Protection and preservation of the coastal dunes is vital to this and succeding generations of the citizens of the City and the State. The dunes are dynamic migrating natural phenomena that help protect lives and propery in adjacent landward areas, and they buffer barrier Islands, and barrier beach spits from the effect of major natural coastal hazards such as hurricanes, storms, flooding, and erosion. Natural dune systems also provide important habitat for wildlife species.(Brigantine) 3. Sand dunes are Vulnerable to erosion by the natural process of the wind, and water, as well as the absence of good hushundry by those responsible for their maintance and preservation. The best available means of protection said dunes against erosion is by preventing indiscriminate trespassing, construction, or other acts which might destroy or damage said dunes and by encouraging the use of native planting, supplemented by sand fencing and other devices designed to reduce the free-blowing of sand and to support athe maintance of the surface tensions, root accumulations,nomal contours and other features typical in natural dunes. (Brigantine) 4. The immediate dune and beach area are not capable of rigid definition or delincation or of completely firm stabilization, so that particular sites, at the time free of dunes, may, as a result of natural forces, become part of the dune area necessary for the continuation of the protection outlined above, and persons purchasing or owning such property shall do so subject to the public interest therein. (Brigantine) 2 6 DRAFT 5. This Ordinance does not attempt to define and regulate all parameters of dune delineation, Function or management and the Borough Council declares its intent to review and update this Ordinance periodically to reflect appropriately new and beneficial knowledge. (Mantoloking) 6. In view of the fact that the Bar-Beach-Dune System provides the only viable protection to property, public and private. and persons within the Borough,from the clearly present hazards of erosion and flooding caused by the Atlantic Ocean during periods of storm, and otherwise, all of the provisions of this Ordinance are deemed necessary, material, and substantial, and therefore, they shall no tbe subject to vaiver the variance.(Mantoloking) I III. Definitions: Accretion: Includes the accumulation of sediment by natural or human-induced means on the beach area, "Natural accretion" is the buildup of land solely by action of the forces of nature on a beach by deposition of waterborne or airborne material. "Artificial accretion" is a similar buildup of land by reason of a human act, such as accretion formed by a breakwater or beachfill deposited by mechanical means. (Atlantic City, Brigantine) Beach Area: Shall mean gently sloping unvegetated areas of sand or other unconsolidated material that extends landward from teh mean high water line to either; the vegetation line;a man-made feature generally parallel to the ocean or bay such as a retaining structure, bulkhead or road, or the seaward (bayward) foot of dunes, whichever is closest to the ocean or bay waters (Barnegat Light) Development Restricion Line: An artificial boundary delineating the extreme limit of allowable development along the shore inland of the existing dune feilds and beaches (Brigantine) Dunes: A dune is a wid and wave deposited or man-made formation of sand (mound or ridge), that lies generally parallel to, and landward of the beach, and between the upland limit of the beach and the foot of the most inland dune slope. "Dune" includes the foredune, secondary, and tertiary dune ridges, as well as man-made dunes, were tehy exist. 1. A formation of sand immediately inland from the the beaches which is stabilized by retaining Structures, and/or snow fences, planted vegetation, and other measures are considered to be dunes regardless of the degree of modification of the dune by wind or wave action or disturbance by development. 2. A small mound of loose, windblown sand found in a street or on a part of a structure as a result of storm activity is not considered to be a "dune". (This definition is intended to reflect the definitions set forth in CAFRA regulations N.J.A.C. 7;7E-3.16 as it may be amended from time to time). (Berkeley) Dune Area: area between the seaward edge of the dune and the landward edge ot the Dune. This shall include all areas within the following districts: Dune Maintence District, Dune Restoration District, and Dune Reconstruction District. (Brigantine) This area is considered to have dynamic boundaries which move in response to seasonal winds and storms. Consequently. the boundaries shall be reviewed every twelve months and following any storm which damages large portions of the Dune Area. The boundary review process will be conducted by the City Council, the Department of Public Works and Resources. (Atlantic City) Dune Crest: the point or line where the dune's highest evevation is located. (Brigantine) 27 DRAFT Dne Consultant: shall mean an expert on dunes and their care retained by the Borough. In any, periods which no such expert is regularly retained, it shall mean such other person designated by the Borough Council. (Mantoloking) Dune Inspector(s): shall mean that person or those persons appointed by the Mayor with the consent of the Borough Council. (Mantoloking) Dune Maintenance District: An artificially designated area delineating dune fields containing one or more dune ridges and having a width greater than 300 feet. The dune surface is stabilized by natural vegetation. (Brigantine) Dune Restoration District: An artifically designated area delineating a dune field containing one or more dune ridges which may be discontinuous between the beach and upland structures and having a width of less than 300 feet. (Brigantine) Dune Reconstruction District: An artificial area delineating a discontinuous dune field or beach area without dunes, poorly developed, unstable and less than 75 feet in width. (Brigantine) Dune and Shoreline Map: a topagraphic survey of dune fields and beaches delineating the following districts: Dune Maintenance District, Dune Restoration, District, and Dune Reconstruction District. The survey will contain, but not be limited to the following information: the dune crestline, dune ridges, and the landward and seaward edge of the dunes. The Map shall be reviewed every twelve months and following any storm which damages large portions of the Dune Area, ( modified combinations of Brigantine and Atlantic City) Dune Vegetation: shall include all plant species found on beaches and dunes notheastern U.S., either native or introduced. which can build and stabilize sand dunes. Specifically, it shall include. but not be limited to, such species as American beachgrass (Ammophila breviligulata). sea rocket (Cakile edentula), seaside spurge (Euphorbia polygonifolia), dune cordgrass (Spartina patens), seaside goldenrod (Solidago sempervirens), dusy miller salt spry rose (Rose rugasa), beach plum (Prunus maritima), etc., which normally grow or may be planted on the soples of the dunes or behind them, with no distinction being made as to how such plants are introduced into their location. (Mantoloking) Erosion: The wearing away of land by the action of natural forces. On a beach, the carrying away of beach materials by wave action, tidal currents, littoral currents or by deflation. (Brigantine) Landward Edge of the Dune: si the lind joining the average Landward Edge of the Dune of the adjoining oceanfront properties, or a line parallel to and 60 feet west of the Seaward Edge of the Dune, whichever is more westerly. (Mantoloking) Mean High Water Line: is the line found by the intersection of a plan at the evelation of Mean High Water with the existing slope of tile beach. (Mantoloking) Mean Sea Level: shall mean the average height of the sea surface, based on observation of all stages of the tide over a ninteen-year period in the United States. Pathway: is an imporved, protective access way, at the grade across the dune (Mantoloking) Person: natural persons, partnerships, firms, associations, joint-stock companies, syndicates and corporations and any receiver, trustee, conservator or other jofficer appointed pursuant to law or by any court, state or federal. "Person" also means the state of New Jersey, counties, municipalities, authorities, other political subdivisions and all departments and agencies within the aforementioned governmental entities. (Atlantic City) 28 DRAFT Sand Fence: shall include the term "snow fence" of a barricade type extablished in the line or a pattern to accumulate sand and aid in the formation of a dune, such as picket type consisting of light wooden fence, 4 feet in height, held together by wire and affixed to wooden posts. Alternate types of "sand fence" may be utilized if approved by the Dune Consultant. (Mantoloking) Seaward Edge of Dune: is the intersection line of the foreslope of the dune and the gradient of the Beach Area or Vegetation Line, or the Upper Driftline, whichever it the more easterly. (Bay Head) Setback Line: is the line ofthe most westward margin of the Landward Edge of the Dune Area. The setback line is delineated on the Dune and Shoreline Map. This Area is considered to have dynamic boundaries which move in response to seasonal winds and storms. Consiquently the boundaries shall be reviewed every five (5) years. Upper Driftline: is that line produced by the Winter Spring Tides (highest tides of the year) which contains oceanic debris (flotsam such as seaweed, etc.) and the seeds, rhizomes, or detached plants which can germinate and/or grow to produce a zone of new dune vegetation. (Mantoloking) Vegetation Line: is that line connecting the most seaward naturally occurring perennial plants with other such plants. (Mantoloking) Walkway: a constructed means of crossing tile dune area in accordance with approval by tile Township. (Brick) III. Permitted and Prohibited Activities: Construction: Construction seaward of the Landward Edge of the Dune and the placement there, except temporarily, of any object that would impede the flow of sand are prohibited, except as provided in this Ordinance and in accordance with any CAFRA regulations, the Land Use Ordinance of the Borough with the following exceptins (Mantoloking): 1. Dune management programs designed to either maintain, restore, or reconstruct dune fields such as supplemental planting or natural vegetation, placement of sand fences, construction of artifical dunes of berms or any other programs that may be authorized through written approval. (Brigantine) Dune Platforms: Although Dune Platforms are not recommend because they affect dune stability and sand transport, some communities do permit them. Therefore the following is to serve as a guide to communities which already permit dune platforms to ensure there is a limited amount of disturbance to tile dunes. 1 . Each oceanfront shall be allowed a "dune platform" not to exceed 200 sauare feet, situated within the dune area and specifically located and delineated by the owner of the premises. The dune platform shall, in all events, be maintained in the same fashion and subject to the same regulations as may govern use of pathways and walkways. 2. The specifications for a dune platform call for neither length or width greater than 18 feet, an elevation of at least 18 inches above any point of sand surface, supporting post 4x4 beams no greater than 6 inches in vertical section, handrails no more than 2 inches in vertical section. 29 DRAFT planking shall be no more than 4" in width installed with at least a 16% gap area in order to permit dune grass to grow underneath: 3. The permit application for a Dune Platform is to be accompainied by a sketch, to scale, showing that is is at least 10 feet to landward of the of mapped current Dune Crestline. The sketh may be prepared by the Dune Inspector. 4. Whenever the dune builds to the point that a part of the dune platform surface is less than 6 inches above the sand surface with 5 feet, that platform shall be raised or rebuilt.Raising an existing dune platfore does not require a permit. Reconstruction of a dune platform shall be subject to issuance of a permit. ( Combinatin of Matolking and Point Pleasant) Sand Removal: Sand which is transported upon lands by action of wind, tides, storms, or any combination thereof shall not be removed from the lot upon which it is deposited by such action. Surplus sand deposited upon any improved street ends shall be restored into tile Beach and Dune area. (Mantoloking) Trespassing: 1. No person shall be In the Dune Area unless: (a) upon an improved Pathway. Walkway or Dune Platform: or (b) in the performance of such activities as may be reasonable and necessarily required to construct or maintain the dune or allowed structures: or (c) for the purposes of inspection, topographical survey, or enforcement of this Ordinance, entry for these purposes will not be deemed an actionable trespass(Mantoloking)2. 2. No person shall operate a motor vehicle across or upon any Dune Area except as may be necessitated for allowed construction or for dune maintenance. (Buy Head) Tampering with Dune Protection Devices: 1. The removal, cutting, burning or destruction of Dune Vegetation, Sand Fences, or such other types of approvcd dune protection devices by the Borough Council in the Dune area Is prohibited, except as necessary for construction or maintenance authorized pursuant to this ordinance. (Mantoloking) 2. Placement of nonliving trees, brush, shrubs, or other debris in the dune area or beach i s prohibited. (Atlantic City) Dune Systems Creation and Expansion: Beach Access: During storms and levels of high water, pathways are often weak links in the coastal dude ridge and become sites of overwash and beaches. Allowing a proliferation of man-made structures over the dunes is also aesthetically displeasing and unnecessary. Therefore, the Borough shall restrict beach access to street ends where feasible. Dune Pathways and steps to permit access across teh dunes or harms to the open beach without damage to the dunes themselves shall be permitted under the following conditions: 1. Access to the beaches and dune fields in all districts delineated by the Dune and Shoreline Map shall be limited to those accessways shown on the Dune and Shoreline Map. No accessways across a dune field shall be constructed by a private owner without a permit issued by the Borough. (Brigantine) No walkways or steps, or combination thereof, shall be approved nor 30 DRAFT constructed to grant access to the beach on or across any lot, which lot has a boundary line or lot line adjacent to a public stree, alley, or easement giving access to the open beach. (Long Beach) 2. One pathway or walkway across the dune area is permitred for each residence. It shall run, generally, the shortest practical course between the residence and the seaward edge of the dune, and shall not exceed four feet in width. (Bay Head) At streetend, 10' walkways may be delineated which are angled to the southeast. A zig-zag or offset in the path is preferable as the dune area widens. These offsets are necessary to reduce direct overwash through the gap in the dunes. 3. In the even that any pathway or walkway shall be or become, in the opinion of the Dune Consultant or Inspector, a substantial detriment to the developement and maintenance of the continuous protective dune sought to e achieved by this ordinance, the owner of the premise shall be subject to provisions of the Permit section of this ordinance. (Bay Head) 4. A walkway is exempt from any provisions requiring a construction permit provided that it does not extend westward of the landward Edge of the Dune or to the eastward of the seaward edge of the dunee; is at least four inches above the highest point of the Dune over which it passes;is not wider than four feet; provided at least 16% of the walkway surface as gap space between the walkway surface boards in order to permit dun grass to grow underneath; has a walkway surface including lateral supporting members with a vertical cross-section of not more than five inches. (Bay Head) 5. Where an elevated walkway is constructed and sand has accreted to a point where the walkway is on the surface of the san at the dune crest and is below the adjacent crest, the natural accretion of the dune is impede, unless the dune height exceeds the acceptable dune height. In such case, the Dune Inspector shall serve written notice, cerified by mail return receipt requested, upon teh record owner westward of the dune at his last known address, directing that the walkway be raised in compliance with the standards of this ordinance and if the walkway is not raised within a period of six months from the date of such notice, the Borough may raise the walkway at the expense of the owner. In such case, the cost of construction shall become a lein on the real property situated immediately westward of the Dune. (Bay Head) 6. If an elevated walkay is not used to access the ocean , the pathway shall be protected by placing suitable material on the sand surface, be removed when the premises are not occupied. The depth of a crestline gap is the vertical destance between the bottom of the pathway through the crest of the dune and a line connecting the highest points fo the dune with 20 feet on either side of the pathway (Mantoloking) The construction of elevated walkways over the crest of the dune is encouraged to preserve the Dune Area (Bay Head) If the crestline gap depth is two feet or more at any time , the pathway shall be replaced by an elevated walkway (mantoloking) Dune Dimensions: One of the purposes of thsi ordinance is to achieve the maintance of sand dunes at the highest level of protection from erosion and the effects of coastal storms. To this end no dune shall be directly or indirectly reduced in height or width by the action or inaction of any owner or his/he agent. However , if any dude shall be or become lower or narrowe than the dimensions deemed materially significant by the Dune Consultant applying recognized criteria wiht due regard to the intent of this ordinance and reasonable use of the premise, the owner thereof shall be obliged to install Sand Fence and planting in accordance with the specifications set forth in this ordinance at his/her expense. The owner shall have an obligation to maintain and replace, if necessary, such fences and planting. In such case, the cost of construction shall become a lien on the real property siniate immediately landward of the dune. the dimensions of the dune area shall be as follows: 3 1 DRAFT 1. Dunes should be located on the order of 100 feet landward of the Mean High Tide (MHT) line. 2. The slope of a dune should be maintained at a 1.5 (vertical horizontal)Slope. 3. The height/width ration should be maintained at 1.10 4. Dunes will be maintained at a minimum elevation of fourteen feet (14') above mean sea level at the bulkhead line at an elevation of sixteen feet (16') above mean sea level at the oceanfront buildin line. Dune Vegetation and Planting: In order to provide for effective protection and/or restoration of the dune areas, each owner shall plant or cause to he planted in the Dune Area adjoining his property Suitable vegetation and erect, or cause to be erected, in the Dune Area, suitable sand fencing all in accordance with the specifications set forth in this ordinance and in conformance with the current standards fo the U.S. Natural Resources Conservation Service. (Brick) 1 For inital planting, or replanting sparse areas. "Cape" American beachgrass (Ammophila breviligulata) Should be used. The entire Dune Area shall be planted. 2. Planting may take place any time between October 15th and April 1st, if the ground is not frozen. Spring planting should he accompanied by frequent watering. Initial and subsequent fertilization is recommended at the rate of about 2 pounds of slow-release 10- 10- 10 per 1000 square fleet. 3. Only fresh planting stock cut back to 16-18 inches long, shall be utilized. Spacing shall be no greater than 18 inches, two stems to a hole, at least 7 inches deep, If not planted with a water flooding method, the sand shall be compacted by rains before planting is commenced to eliminate any airpockets. 4. After beachgrass has been established, other appropriate vegetation may be added. (Mantoloking) Sand Fencing: 1 .Fencing shall be standard 4-foot wood sand (snow) fence in good condition, secured to wooden posts of a minimum cross-section of 4 square inches and a minimum length of 6-1/2 feet, with maximum span between posts of 12 feet. Alternate fencing, as approved by the Dune Inspector with advice of the Dune Consultant, prior to installation, may be utilized. 2. There shall be at least two lines of fencing the length of the Dune Area of each property. At least one line of fencing should be in a zig-zag pattern with alternate posts offset by at least 5 feet. Half-height fencing may be used on the dune back. 3. A straight (or zig-zag) line of fencing may be erected adjacent to the seaward toe of the dune to prevent incursion into the dune area, but if it is more than 3 feet to seaward, a permit is required and such fencing must be removed during the winter months.(mantolking) 4. The construction of fencing along the western limits of the backshore and dunes areas and provide or require suitable markings to identify the dune area is permited to prevent damage to the dunes or berms from indiscriminate passage. (Beach Haven) Repairing and Maintaining Coastal Dunes: Vegetation Maintenance: Fertilizaton should be applied each spring after regrowth begins to established dune vegetation. Yearly fertilization for maintenance should not exceed 50 lb of nitrogen breviligula will be replanted following the specifications set forth by the U.S. Natural Resources Conservation Service. 3 2 DRAFT Signage: Due to the transient population of a summer resort, it is necessary to remind visitors that the dunes are fragile and it is illegal to walk on them. Signs must be placed to notify and educate beach users; consideration should be given to placing some signs right on the sand fencing. (Ocean City) Fixing Blowouts: Blow-outs in the dune system will be repaired by placing a sand fence between the existing dune parts. One or more fences may be required. It is essential to tie the ends of the fence into the existing dune to keep the wind from whipping aroudn the ends Dune Replenishment: The municipality shall not undertake any mechanical manipulation, including but not limited to bulldozing, grading and scraping, of the beach and dune area unless written authorization is received From the New Jersey Department of Environmental Protection, Division of Coastal Resources (Brick) Permits: 1 ) A permit shall not he required for the planting of dune grass or other appropriate vegetation, or for the erection of sand fencing or the placement of temporary walkway protection in the Dune area in compliance with approved standards set forth in this Ordinance. All other construction, modification, alterations, or like activity in the Dune area, unless specifically exempted in this Ordinance, shall require that the owner or his/her agent obtain a Dune Area Permit. Activities requiring a Permit include but are not limited to elevated walkways, dune platforms, and the placement of sand fencing more than 3 feet seaward of the Seaward Edge of the Dune. All permits are subject to revocation, suspension or modification in the event of changed site conditions, as determined by the Dune Inspector with advise of the Dune Consultant. The permittee or any agent shall promptly, Upon request, allow any Borough official to examine the permit or a certified true copy thereof at any time. 2) The Dune Inspector shall make periodic Inspections and shall provide written advice to owners. These writings shall not be deemed as notice of violations of this Ordinance, but shall be maintained as part of the record for the Subject property and may be considered by the Court in the imposition of penalty upon conviction under any Subsequent complaint for violation of this Ordinance. Further, the Dune Inspector shall coordinate his or her efforts with those of the Dune Consultant(s) to the end that the purposes of this ordinance may be achieved. (Mantoloking) Conditions for Issuance of Permit: No such permit shall be issued without a determination by tile City Engineer, based upon an inspection of the area involved, that such removal sand will not create or increase a danger or hazard to life or property. No permit will be granted if the proposed moving or displacement will: 1 . Adversely affect the littoral drift in the districts delineated by the Dune and Shoreline Map or other municipalities within this reach 2. Result in a reduction of dune protection as provided for in the Dune and Shoreline Map. 3. Interfere with the general configuratin of the districts as delineated by the Dune and Shoreline Map. 4 Otherwise substantially impair or interfere wiht the inten tand purpose and objectives of this ordinance. (Brigantine) DRAFT Enforcement: The Borough Dune Inspector or, in his absence, the Chief of Police and in all events the Borough Council shall enforce the affirmative duty of each ocean front owner, as set forth in this Ordinance. Owners have 30 days after receiving a written notice to begin to comply with the ordinance or they will be subject to pay the cost with interest at the highest legal rate via a lien on the property. (Mantoloking) Violations and Penalties: For each and every violation of this Ordinance, the regulation or standards set forth in the Ordinance, or the terms and conditions of any permitted issued hereunder, the owner of lands abutting the beach or Dune Area where such violation has been committed, or the trespasser and any contractor or agent fo the owner shall for each and ever violation be subject to a fine of not more than one thousand dollars ($1000) or imprisonment for a term not to exceed ninety (90) days, or both, at the discretion of the Court having jurisdictin in this matter. Each and every day that a violation continues shall be considered a separate offense. (Bay Head) 34 DRAFT Appendix B: Suppliers of Dune Veggetation in the New.Jersey, New York, and Delaware Re2ion Ammophilla breviligulata (American beachgrass) Gre- Bunting Steve & Phd DUbreviHe Cape Farins Old Cellar Creek Farms RD #l, Box E 134A 801 N. Shore Road Lewes. DE, 19958 Beeseivs Pt.. NJ 08223 Phone: (302) 94-5-1840 Phone: (609) 390-0806 (111id) Church's GrcQnhousc. &NUrsery Peat & Solls 522 Seashore Road 32 Old C0Un1rV Road Cape May, NJ 08204 West Hampton. NY 11977 Mauriectown. NJ 0832" Phone: (516) 288-3458 Plione: (609) 884-3927 Gary Timberinan Phil Clarkson RD h' L Box 180 P.O. Box 3@7 Bridueton, NJ 08.)02 I'Llckahoe. NJ 082-50 Phone (609) 451-242-21 Phone: (609) 628-2-406 11. R. TaIrria,",c & Soil Judy Ord Attn: Ellen Talmage I-riar*s Farm 1145 Fathom Road 36 Sound Avenue. RFD -fl Manallawkin. NJ 0,3050 Riverhead. NY 11901 Phone: 016) 72'7-0124 Coastal Nurserics, hic. .,\rnold Clemenson P.O. Box 42 MaUricctown. NJ 08327 Phone: (609) 476-3903 Fax: (609) 476-1003 'AVALON' Spartina patens (saltmeadow cordurass) Church's Greenhouse & Nurserv Don Knezick 522 Seashore Road Pitielands NLirserv Capc May, NJ 08204 RRI, Box 12 Island Road Phone: (609) 884-3927 ColumbLis, NJ 08022 Phone. (609) 291-9486 Coastal Nurseries. hic. Peat & Sons Arnold Clemenson 32 Old COUntry Road P.O. Box 42 West Hampton, NY 11977 Matiricetown. N`J 08-,27 Phone: (5i6) 288-3458 11hone: (609) 476-190', J.'ax: (609) 476-3903 11. R. Talmage & Soil ,,Nttti: Ellen Tainia,-,e Friar's F.11-111 3 5 DRAFT 36 Sound Avenue, RFD # 1 Riverhead, NY 11901 Pone: (516) 727-0124 'BAYSHORE'Spartina alterniflora (smooth cordgrass) Peat & Sons Coastal Nurseries, Inc. 32 Old Country Road Arnold Clemenson West Hampton, NY 11977 P.0. Box 42 Phone: (516) 288-3458 Mauricetown, NJ 08327 Phone: (609) 476-3903 Fax: (609) 476-390 H. R. Talmage & Son Attn: Ellen Talmage Friar's Farm 36 Sound Avenue, RFD #1 Riverhead, NY 11901 Phone: (516) 727-0124 'EMERALD SEA'Juniperus conferta (shore juniper) Rhodo-Lake Nursery Centerton Nurseries Rolland DcWilde RD #5. Route 553 RD # 1 Brideton, NJ 08302 Bridgton, NJ 08302 Phone: 455-0926 Phone: (609) 451-5877 Mike Callis Ferruci Nurseries Woodbourne Cultural Nursery Piney Hollow Road & 301 Colonial Spring Road Victoria Avenue Melville, NY 11747 Newfield. NJ 08344 Phone: (718) 343-6400 Phone: (609) 697-1950 (516) 249-2320 'OCEAN VIEW' Prunus maritima (beachplum) Coastal Nurseries. Inc. Robert Ott Arnold Clemenson 209 Old Cranberry Road P.O. Box 42 Cranberry, NJ 08512 Mauricetown, NJ 08327 Phone: (609) 395-1366 Phone: (609) 476-3903 Fax: (609) 476-3903 Hess Nurseries, Inc. Pinelands Nursery P.0. Box 326 RR1. Box 12, Island Road Cedarville, NJ 08311 Colunbus, NJ 08022 Phone: (216) 259-5571 Phone: (609) 291-9486 Peat & Soils Sepers Nursery 32 Old Country Road 1003 Columbia Ave West Hampton, NY 11977 Newfield. NJ 08344 Phone: (516) 288-3458 Phone: (609) 691-0597 36 "SANDY" Rosa rugosa (rugosa rose) Coastal Nurseries, Inc. Erie Perennial Farm Aronld Clemenson Atten: Terry O'Brien P.O. Box 42 3052 Kulp Road Mauricetown, NJ 08327 Eden, NY 14057 Phone: (609) 476-3903 Phone: (716) 992-9466 Fax: (609) 476-3903 Peat & Sons Sepers Nursery 32 Old Country Road 1003 Columbia Ave West Hampton, NY 11977 Newfield, NJ 08344 Phone: (516) 288-3458 Phone: (609) 691-0597 Springfield Nursery, Inc. 490 Mountian Avenue Springfield, NJ 07081 Phone: (201) 379-5811 "WILDWOOD" Myrica pensylvanica (bayberry) Coastal Nurseries, Inc. Robert Ott Arnold Clemenson 209 Old Cranberry Road P.O. Box 42 Cranberry, NJ 08512 Mauricetown, NJ 08327 Phone: (609) 395-1366 Phone: (609) 476-3903 Fax: (609) 753-1160 Arrowwood Nursery, Inc. Crowshaw Nursery P.O. Box 418C Mill Lane, P.O. Box 339 Malaga Road Columbus, NJ 08022 Williamstown, NJ 08094 Phone: (609) 298-0477 Phone: (609) 753-1160 Hess Nurseries, Inc. Pinelands Nursery P.O. Box 326 RRI, Box 12, Island Road Cedarville, NJ 08311 Columbus, NJ 08022 Phone: (216) 259-5571 Phone: (609)291-9486 Peat & Sons Sepers Nursery 32 Old Country Road 1003 Columbia Ave West Hampton, NY 11977 Newfield, NJ 08344 Phone: (516) 288-3458 Phone: (609) 691-0597 Springfield Nursery, Inc. 490 Mountian Avenue Springfield, NJ 07081 Phone: (201) 379-5811 Adopted from: Natural Resource Conservation Service. (1995) Plant Source from Cane May PMC, Somerset. 37 NOAA COASTAL SERVICES CTR LIBRARY I 3 6668 14111783 0