Some Data Points on Shoreline Retreat Attributable to Coastal Subsidence,
COASTAL ENGINEERING RESEARCH CENTER FORT BELVOIR VA
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Coastal subsidence increases flooding in low lying coastal regions. Moreover, it disturbs the equilibrium profile, and allows waves to erode bluffs formerly above the reach of wave uprush. Ensuing adjustment of the profile drives the shoreline farther landward. Guidance is needed for obtaining quantitative estimates of the shores response. The mean surface elevation of Lake Michigan rose 0.5 meter during a recent 4-year period. Concurrently, major elements of the submerged profile responded by building upward and migrating 26 meters landward. Approximately 8 meters of beach were lost due to submergence beneath the elevated lake surface and an additional 6 to 7 meters were lost due to erosion. The shoreline, however, lagged behind the rest of the profile in adjusting to the higher water levels.
- Geology, Geochemistry and Mineralogy