Holmberg Technologies, Inc.
7161 Brookhaven Terrace
Englewood, FL 34224
|Best Kept Secrets|
|Soft Shore Conference|
|Causes of Erosion
|Dr. Pilkey vs Army Corps|
|Great Lakes Beaches|
|Home Owner Rights
|Links and Websites||Contact Us|
Walls force waves and currents to move beach offshore
ABSTRACT FORM FOR ALL GSA MEETINGS IN 1994
Complete all sections (1) through (9) below.(1)TYPE ABSTRACT COMPLETELY WITHIN THE BLUE LINES BELOW. (10 point type minimum)
LAKEBED DOWNCUTTING AND ITS EFFECT ON SHORE
PROTECTION STRUCTURES JOHNSON, Charles N. , US Army Corps of Engineers
North Central Division, 111 N Canal St, Chicago
The standard shore-protection design manuals, for example the Shore Protection Manual, are based on laboratory tests with fixed beds. Standard revetment designs are optimized to use the minimum possible volumes of stone. Standard groin designs assume that the beach material is stable against shore-normal transport. Sheetpile seawall design is based on an assumed lakedbed elevation. None of these designs have much reserve, either functionally or structurally, against undermining. Great Lakes shore erosion is caused by weathering and abrasion of the cloys and soft sedimentary rock that form most of each Lake’s perimeter. Vast areas of nearshore lakebed are affected by these geological processes. Revetment toes are undermined, causing settlement of the entire structure and loss of backfill. Lakebed deepening destabilizes beaches and causes them to migrate away from the water’s edge, rendering groins ineffective. Sheetpile walls collapse suddenly whenever the penetration becomes inadequate. The lethal effects of lakebed downcutting on shore protection structures tell us that such structures are inherently futile and can only be useful for buying a few more years of upland lifetime at the expense of beach loss.
Visit our other web site at: www.blufferosion.com
Copyright © 1999 - 2014 Holmberg Technologies, Inc.