So You’d Like to Stop Shore Erosion along the Calvert ...
So You'd Like to Stop Shore Erosion along the Calvert Cliffs. You'd better think before you
act.
Curtis Larsen and Inga Clark U.S. Geological Survey Reston, VA 20192 And Martha Herzog
National Oceanic and Atmospheric Administration Silver Spring, MD
The Conclusion First:
There are two processes acting on eroding sea cliffs. The most obvious process is bluff retreat.
The second is slope failure and bluff top retreat until a stable angle of repose is attained. Along the Calvert
Cliffs, the stable angle is 35 degrees. Once the first process ends, the bluff top recedes until the stable slope angle is reached. IN CALVERT COUNTY THIS
TAKES PLACE IN ONLY 30 YEARS--THE LENGTH OF A MORTGAGE.
In short, any attempt to stop bluff recession by retarding wave erosion of the toe of the bluff results in immediate
bluff top retreat.
A top retreat
slope failure (parallel retreat)
downcutting and removal of toe material
toe recession
top retreat slumps, rotational slides
colluvium
toe accumulation
B colluvium
m, msl 30
20
Post- St. Mary's top cliff gravels, sands and clays
St. Mary's clays, silts, interbedded clays and sands, silty fine sand and fossiliferous sandstone
Choptank clays, silts and
10
densly packed fine sand with shells
0 gravel
sand
silty fine sand fine sand with shells
Plum Point sandy clays and sands with shells
fossiliferous sandstone silt
interbedded clay and sand clay
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