Sand ridges on the inner Atlantic shelf of North America: Morphometric comparisons with Huthnance stability model |
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| Authors: | A G Figueiredo Jr D J P Swift Stubblefield T L Clarke |
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| Institution: | (1) Present address: RSMAS, Division of Marine Geology and Geophysics, University of Miami, 4600 Rickenbacker Causeway, 33149 Miami, FL;(2) Present address: Plano Research Center, ARCO Oil and Gas Company, Box 2819, 75221 Dallas, TX;(3) Present address: NOAA, 1600 Port Boulevard, 33132 Miami, FL;(4) Atlantic Oceanographic and Meteorological Laboratories, NOAA, 4301 Rickenbacker Causeway, 33149 Miami, FL |
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| Abstract: | Sand ridge fields on the inner shelf of the Middle Atlantic Bight are generally thought to have formed in response to northeasterly
storm flows as the shoreface underwent erosional retreat with postglacial sea-level rise. However, the hydrodynamic mechanism
is poorly unerstood. Coastal boundary models see the ridges as responses of the seafloor to distortions in the flow induced
by the coastal boundary. Stability models propose that an irregular initial topography will evolve toward an ordered array
of bedforms in response to repeated flow events. The two classes of models are not mutually exclusive, nor are members within
each class mutually exclusive. Results of measurements of ridge spacing on the inner Atlantic shelf of North America agree
with the predictions of stability models. |
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