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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)

No 02124

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

IL 60606

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.

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