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Estimating Tidal Sediment Erosion in Maryland

Estimating Tidal Sediment Erosion in Maryland. Jeffrey Halka Lamere Hennessee Katie Offerman Department of Natural Resources Resource Assessment Service Maryland Geological Survey. Example from Tilghman Island. White = 1845 Blue = 1942 Yellow = 1989. 5000 feet. DSAS Example.

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Estimating Tidal Sediment Erosion in Maryland

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  1. Estimating Tidal Sediment Erosion in Maryland Jeffrey Halka Lamere Hennessee Katie Offerman Department of Natural Resources Resource Assessment Service Maryland Geological Survey

  2. Example from Tilghman Island White = 1845 Blue = 1942 Yellow = 1989 5000 feet

  3. DSAS Example

  4. Bank Sample Locations

  5. MD Data available • 6,944 miles of shoreline mapped • 242,883 transects • Average erosion rate of 20 cm/yr • Grain size/nutrients at 34 locations

  6. Basic Data Issues • Measure of linear retreat • Vertical data from USGS Topographic sheets • Bank composition • Only from selected locations • Both bluff/bank and marsh • Emplacement of shoreline structures • Impact on average erosion rate calculation

  7. Example from Tilghman Island White = 1845 Blue = 1942 Yellow = 1989 5000 feet

  8. VIMS - Center for Coastal Resources Management (CCRM)

  9. Basic Data Issues - 2 • Incomplete error analysis of historical erosion rate measurements • Both accuracy and resolution issues in areas of low erosion rate • Fastland vs. nearshore erosion

  10. Shoreline ErosionFastland and Nearshore

  11. Dan cliff sampling

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