SEDIMENT DISTRIBUTION IN NEW JERSEY’S COASTAL BAYS & WATERWAYS: A GIS-Approach for Integrating State & Federal Efforts for Long-Term Regional Sediment Management Kimberly K. McKenna Richard Stockton College of NJ Coastal Research Center 30 Wilson Ave, Port Republic, NJ Stewart C. Farrell, Daniel A. Barone, Crist Robine, Robert Koch, Marcus H. Gruver, Douglas Gaffney, Matthew Dalon, Edward Gorleski, Mark J. Mihalasky RSC, Campus Center, Feb 15, 2012
Overview Purpose: Develop a regional-scale framework and baseline study of New Jersey’s coastal waterways and disposal facilities. • Study Area • Phase I: Three-Project Initiative • Project 1: Site Characterization • Project 2: Bayfloor Sediment Distribution & Shoaling Analysis Tasks • Sediment Distribution by County • Project 3: Recommendations for Cape May County CDF Site Selection • Phase II: Delaware River, Delaware Bay, Raritan Bay • Artificial Island
Regional Geologic Record Inner & Outer Coastal Plain – Cretaceous – Tertiary poorly consolidated marine & alluvial sub-deposits Pleistocene – Recent alluvial, beach deposits, marsh, & aeolian from NJ Geological Survey (1940) & USGS: http://3dparks.wr.usgs.gov/nyc/coastalplain/coastalplain.htm
Shoreline Types headlands , spits, estuaries barrier islands & bays ~130 Miles
Phase I: Three-Project Initiative 1. Regional Confined Disposal Facility (CDF) Mapping and Resource Definition 2. Characterization, Mapping, and Dynamics of Sediment in Coastal Waterways 3. Spatial Analysis & Suitability Modeling for Identifying Priority Dredging Areas and Sites for Dredged Material Placement
Project 1: Site Characterization Confined Disposal Confined Disposal Sites (CDS) - those without current Facilities (CDF) - use, but with confining walls those with current multiple uses Unconfined Disposal Sites (UDS) - those without confinement walls and no recent use Uplands Island (UI) – natural feature Other - those sites that were determined to originate from other than placing dredge material on the salt marshes
Field Mapping, Sediment Composition & Volume Calculations Site Investigation - Volume – 2 cm vertical accuracy Above compressed salt marsh surface Sediments – % sand, silt, mud
Ocean CDF Mapping and City Resource Definition NJDOT DMMS GIS Database Corson Inlet Strathmere Sea Isle CDFs visible in City aerial photography along the NJ Intracoastal Waterway... Townsends Project 1: Site Selection & Classification Inlet Avalon
Project 2: Bay Water Sediment Characterization • Define bayfloor character through sediment sampling; • Create maps of sediment distribution; • Examine previous dredging data; • Conduct shoaling analyses to identify and prioritize areas in need of maintenance dredging; and • Use spatial data analysis and modeling to prioritize maintenance dredging activities
Methods Determine sample site distribution Obtain 196 cores Textural Analysis (% silt; % sand) GIS Statistical Analyses & Regional Sediment Maps
Bay Sediments Around Inlets PURE SAND MIXED LAYERS OCCASIONAL SAND LAYERS Closer to Inlets... ...Further from Inlets
Bay Sediments In Back Bays Finer Grain and More Organic-Rich Sediments MUD & FOSSILS MUD & PLANTS MARSH SOD
Monmouth County Bayfloor Characterization Navesink Estuary Shrewsbury Estuary Shark River Manasquan River
Ocean County Bayfloor Characterization Barnegat Bay Little Egg Harbor
Atlantic County Bayfloor Characterization Great Bay Little Bay Reeds Bay Absecon Bay Lakes Bay Scull Bay
Cape May County Bayfloor Characterization Great Egg Harbor Bay Peck Bay Ludlam Bay Townsend Sound Great Sound Jenkins Sound Grassy Sound Richardson Sound Cape May Harbor
Cape May - North
Cape May - South
Maintenance Dredging
Cape May - North
Cape May - South
Cape May County - Priority Dredging Areas Cape May Harbor Ludlam Bay Crook Horn Creek Devils Reach Schellenger Creek Spicers Creek Middle Thorofare Ottens Harbor Beach Creek Great Flat Thorofare Stone Harbor Canal Scotch Bonnet Cressee Thorofare Venetian Bayou Beach Thorofare Ludlam Thorofare
Priority Site Selection • Location (proximity to Crookhorn Creek TIN waterways and/or roads) • Size/Capacity • Sediment Composition • Past and Current Use
Cape May County Priority CDFs • Linger Point (1 & 2) • Shaw Island • Gravens Thorofare (1) • Ludlam Thorofare (1 & 2) • Devils Island • Crook Horn Creek • Clubhouse Lagoon (1) • Sanctuary Island
Phase II: State/Federal Placement Sites Total Sites in Database = 300 Total CDFs = 99 County Priority CDFs Atlantic 6 Burlington 2 Camden 0 Cape May 11 Cumberland 0 Gloucester 1 Monmouth 4* Ocean 6 Salem 6
Artificial Island • Understand the distribution and quantities of sediment within the CDF • GPS Surveys, Sediment Cores & Composition • GIS 3-D Representation of Disposal Area
Thank you for attending the CRC 25 th Anniversary Conference! RSC, Campus Center, Feb 15, 2012
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