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The Long Island Coastal Planning Project

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Regional Sediment Management: The Long Island Coastal Planning Project Lynn M. Bocamazo Senior Coastal Engineer USACE-New York District 22 September 2009 US Army Corps of Engineers BUILDING STRONG® Outline Project Location General Setting Purpose Goals Tasks Performed Plan through April 2010 BUILDING STRONG® Project Location Block Island Sound Long Island Sound Montauk Point Manhattan Shinnecock Bay Moriches Bay Long Island Shinnecock Inlet Montauk Moriches ay th B t Sou Inlet Grea Ponds Atlantic Ocean Jones Fire Island Westhampton E. Rockaway Inlet Inlet Rockaway Inlet Inlet Jones Fire Island Scale Long Island Beach 0 8 16 Kilometers Rockaway BUILDING STRONG® 6RXWK6KRUHRI/RQJ,VODQG 0LOHVRI*HRORJLF3RSXODWHG'LYHUVLW\ • %DUULHU,VODQGV • +HDGODQGV • %D\V • 0DLQODQGRI/RZO\LQJ &RDVWDO3ODLQ • 8UEDQ6XEXUEDQDQG 5XUDO$UHDV • 7UHPHQGRXV3RSXODWLRQ *URZWKRQ/RQJ,VODQG VLQFHWKH+XUULFDQHRI BUILDING STRONG® Shifting Sand BUILDING STRONG® Shifting Sand BUILDING STRONG® The South Shore of Long Island Six Federal Navigation Projects (Rockaway, East Rockaway, Jones, Fire Island, Moriches and Shinnecock Inlets) Four Corps Storm Damage Reduction Projects (Coney Island, Rockaway, Westhampton Interim, West of Shinnecock Interim) Feasibility Studies: Long Beach, Fire Island Inlet to Montauk Point, Montauk Point Lighthouse Area Intracoastal Waterway within three south shore bays, also Jamaica Bay Many County and Local Channels, Marinas and Harbors Diverse Economy, Geology and Ecology BUILDING STRONG® Long Island Coastal Planning Project “Institutionalizing RSM on the South Shore of Long Island” NAN has ad hoc RSM, trying to make it into a program Reach out to State, Counties, Municipalities, NGO’s, Sea Grant, other Federal Agencies and other stakeholders Motivation? Congressionals seeing that the Corps and other Federal and local entities need to come together over borrow material, environmental and jurisdictional issues regarding sand resources From “Lessons Learned”, experience from other Districts, NAN saw the necessity of moving from ad hoc coordination to a more deliberate networking/coordination BUILDING STRONG® Congressional Direction Over the course of the 4 year project, legislation specifically asked for the following: (1) Collect and inventory sediment resources and related coastal process data from various federal and state agencies as well as academic institutions and other nonprofits, municipal governments, and individuals. Through the National Coastal Data Bank, this data will also be available at no cost for any to use. (2) Identify gaps in data and how best to use the resources of cooperating agencies and institutions to fill those gaps. (3) Develop a regional sediment budget (location, quantity, and qualities of sand sources) for the Atlantic Coast of Long Island. (4) Develop an inventory of existing sediment borrow areas off the coast of Long Island and subsequently develop a plan to monitor and manage those borrows areas in conjunction with sound water resource management practices. BUILDING STRONG® Congressional Direction Also from the legislation: Immediately following its funding, a Project Team will be formed with federal, state, and local government participation. The Project Team will meet at least bi-monthly to agree upon Regional Sediment Management (RSM) goals and plans to achieve them, assign tasks and monitor progress in developing the plan. At the beginning of the fifth year, the Project Team will adopt one or more regional plans for the management of existing inlets, channels, beaches, borrow areas, and related coastal environmental resources. BUILDING STRONG® LICPP Development Build off existing RSM program demos Leverage work being done for other Corps studies (FIMP, Jones Inlet) and other non-Corps studies Initially no large scale data collection Tap into local knowledge (Stony Brook University, NY Sea Grant, South Shore Estuary Reserve Program, Counties, Municipalities other NGO’s) Develop outyear priorities with input from stakeholders BUILDING STRONG® Ultimate Goals of the LICPP LICPP will leverage numerous ongoing activities on the South Shore of LI, as well as ongoing national initiatives to accomplish the following: Increase the efficiency of maintaining navigation channels Optimize the beneficial use of material dredged from inlets, ports, harbors, and other opportunistic sediment sources Reduce shoreline erosion and coastal storm damages Provide for environmental restoration and protection Restore and preserve beaches Improve collection and dissemination of data related to the movement of sediment Facilitate cooperation among federal and non-federal interests “Institutionalize” RSM on the South Shore of Long Island BUILDING STRONG® Tasks Performed to Date (Aug 09) Formed internal and external Project Delivery Teams (PDT), held numerous mtgs/conference calls. Held technical workshop to review and inventory sediment resources and related coastal processes b white paper under preparation Developed shoreline and inlet morphology model (CASCADE) for the Fire Island to Montauk Point area, technology transferred to the District. Developed inventory of existing sediment borrow areas. Compiled existing inlet and shoreline sediment budgets. Cooperated with USGS on offshore borrow sources monitoring plan and shoreline change analysis for inclusion in sediment budgets. Performed 7 monthly beach profiles at Pt. Lookout following beneficial use placement of inlet material (Jones Inlet). Further developed the Long Island Sediment Needs Assessment (LISNA) database. BUILDING STRONG® Cascade Model For New York NewFY09 Existing Cascade Model BUILDING STRONG ® Cascade: Montauk Point to Fire Island Inlet 250000 Atlantic Ocean ear) Fire Island Inlet 200000 Shinnecock Moriches Inlet Inlet 150000 Simulation of Shoreline 100000 Evolution 1931-1983 (detail) 50000 Data from 5200 Rosati et al. (1999) 0 Land Shinnecock Inlet meas. 1983 initial 1931 (m**3/y Transport Longshore Mean -50000 4800 calc. 1983 0 40 80 120 160 Distance West from Montauk Point (km) 4400 Calculated Net Longshore 4000 Shoreline Position (m) Position Shoreline Sediment Transport (1983-1995) Moriches Inlet 3600 3200 20 40 60 80 100 120 140 160 Distance West from Montauk Point (km) Work Done By: Sophie Munger & Nick Kraus, ERDC, Coastal & Hydraulics Lab. BUILDING STRONG® 8 ) 3 Cascade: Inlet Evolution Shinnecock Inlet 6 Moriches Inlet 4 2 4 Ebb Shoal Complex Volume (mill. m (mill. Volume Complex Shoal Ebb 0 ) 3 1920 1940 1960 1980 2000 3 Time (year) Ebb shoal complex volume 2 2000 Moriches Inlet Shinnecock Inlet 1 1600 Shinnecock Inlet Flood Shoal Volume (mill.m Moriches Inlet 1200 0 1920 1940 1960 1980 2000 Time (year) 800 Flood shoal volume Minimum Inlet Area (m**2) 400 0 1930 1940 1950 1960 1970 1980 1990 2000 Time (year) Inlet cross-sectional area BUILDING STRONG® Planned Cascade Application FY 09: Jones Inlet New FY09 Data collected at Point Lookout as part of the monitoring and channel dredging projects will be used as input and verification data for the Cascade modeling effort. • sediment source term (placement) • calibrate aeolian transport parameters BUILDING STRONG® LICPP Borrow Tasks Develop an inventory of existing sediment borrow areas off the coast of Long Island and subsequently develop a plan to monitor and manage those borrows areas in conjunction with sound water resource management practices. By no later than the beginning of the fifth year after the initiation of this plan, the Project Team will adopt one or more regional plans for the management of existing inlets, channels, beaches, borrow areas, and related coastal environmental resources. This plan can contain elements that can be implemented by both federal and non- federal interests. It will be integrated with the substance and recommendations of the reformulated Fire Island to Montauk Point Plan (FIMP). BUILDING STRONG® Inventory Results BUILDING STRONG® Inventory Results BUILDING STRONG® Progress to Date on Offshore Sediment Resource Issue From the Technical Workshop held to review and inventory sediment resources and related coastal processes: Consensus was reached on the following: the area of interest is sediment rich; that the distribution of wave energy will change due to borrow pit excavation on sand ridges; that sand is likely to move onshore, and that the distribution of the mechanisms is unknown at this point. The following data was proposed for potential collection, towards the aim of improving predictability of the onshore sand transport, recovery of the borrow sites, and wave impacts on the shoreline, as part of pre- and post borrow area monitoring program to be recommended by NYD in order of priority for an area surrounding the ridge borrow areas, and a non-ridge control area: repeated high resolution bathymetry; installation of two directional wave gages (one in the area of interest, one at the boundary); installation of current meters; CT gage (to measure water density), installation of ADV gages (to measure bottom stress); and ABS gages (to measure suspended sediment concentrations). The model to be used has not yet been determined, however, it was estimated that the modeling effort would require approximately one year to conduct. BUILDING STRONG® SEDIMENT BUDGETS Fire Island to Montauk Point, 83 miles, recently completed (Reformulation Study) Coney Island, 4 miles (GDM, 1990) Rockaway, 7 miles (Section 934, 1993) Long Beach, 9 miles (Feasibility, 1996) Inlet Sediment Budgets Shinnecock, Moriches, Fire Island, &
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