SEDIMENT DISTRIBUTION IN NEW JERSEYS COASTAL BAYS & WATERWAYS: - - PowerPoint PPT Presentation

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SEDIMENT DISTRIBUTION IN NEW JERSEYS COASTAL BAYS & WATERWAYS: - - PowerPoint PPT Presentation

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SEDIMENT DISTRIBUTION IN NEW JERSEYS 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

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SEDIMENT DISTRIBUTION IN NEW JERSEY’S COASTAL BAYS & WATERWAYS:

A GIS-Approach for Integrating State & Federal Efforts for Long-Term Regional Sediment Management

Stewart C. Farrell, Daniel A. Barone, Crist Robine, Robert Koch, Marcus H. Gruver, Douglas Gaffney, Matthew Dalon, Edward Gorleski, Mark J. Mihalasky

Kimberly K. McKenna

Richard Stockton College of NJ Coastal Research Center 30 Wilson Ave, Port Republic, NJ

RSC, Campus Center, Feb 15, 2012

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Overview

  • 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

Purpose: Develop a regional-scale framework and baseline study of New Jersey’s coastal waterways and disposal facilities.

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Inner & Outer Coastal Plain –

from NJ Geological Survey (1940) & USGS: http://3dparks.wr.usgs.gov/nyc/coastalplain/coastalplain.htm

Regional Geologic Record

Cretaceous – Tertiary poorly consolidated marine & alluvial sub-deposits Pleistocene – Recent alluvial, beach deposits, marsh, & aeolian

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SLIDE 4

Shoreline Types

~130 Miles

headlands , spits, estuaries barrier islands & bays

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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

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Project 1: Site Characterization

Other - those sites that were determined to originate from

  • ther than placing

dredge material on the salt marshes

Confined Disposal

Facilities (CDF) - those with current multiple uses Confined Disposal Sites (CDS) - those without current use, but with confining walls Unconfined Disposal Sites (UDS) - those without confinement walls and no recent use Uplands Island (UI) – natural feature

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Field Mapping, Sediment Composition & Volume Calculations

Sediments – % sand, silt, mud Site Investigation - 2 cm vertical accuracy Volume – Above compressed salt marsh surface

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Project 1: Site Selection & Classification

CDF Mapping and Resource Definition

NJDOT DMMS GIS Database

Corson Inlet Townsends Inlet Avalon Sea Isle City Strathmere

CDFs visible in aerial photography along the NJ Intracoastal Waterway...

Ocean City

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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

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Methods

GIS Statistical Analyses & Regional Sediment Maps Determine sample site distribution Obtain 196 cores Textural Analysis (% silt; % sand)

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SLIDE 11

PURE SAND MIXED LAYERS OCCASIONAL SAND LAYERS

Closer to Inlets... ...Further from Inlets

Bay Sediments Around Inlets

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SLIDE 12

MUD & FOSSILS MUD & PLANTS MARSH SOD Finer Grain and More Organic-Rich Sediments

Bay Sediments In Back Bays

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Bayfloor Characterization

Monmouth County

Navesink Estuary Shrewsbury Estuary Shark River Manasquan River

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Bayfloor Characterization

Ocean County

Barnegat Bay Little Egg Harbor

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Bayfloor Characterization

Atlantic County

Great Bay Little Bay Reeds Bay Absecon Bay Lakes Bay Scull Bay

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Bayfloor Characterization

Cape May County Great Egg Harbor Bay Peck Bay Ludlam Bay Townsend Sound Great Sound Jenkins Sound Grassy Sound Richardson Sound Cape May Harbor

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Cape May - North

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Cape May - South

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Maintenance Dredging

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Cape May - North

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SLIDE 21

Cape May - South

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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

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Priority Site Selection

  • Location (proximity to

waterways and/or roads)

  • Size/Capacity
  • Sediment Composition
  • Past and Current Use

Crookhorn Creek TIN

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SLIDE 24

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
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SLIDE 25

Phase II: State/Federal Placement Sites

Total Sites in Database = 300 Total CDFs = 99

County Priority CDFs

Atlantic 6 Burlington 2 Camden Cape May 11 Cumberland Gloucester 1 Monmouth 4* Ocean 6 Salem 6

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SLIDE 26

Artificial Island

  • Understand

the distribution and quantities

  • f sediment

within the CDF

  • GPS Surveys,

Sediment Cores & Composition

  • GIS 3-D

Representation

  • f Disposal Area
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SLIDE 27

Thank you for attending the CRC 25th Anniversary Conference!

RSC, Campus Center, Feb 15, 2012