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The AAPG/Datapages Combined Publications Database

GCAGS Transactions


Gulf Coast Association of Geological Societies Transactions
Vol. 53 (2003), Pages 765-771

Previous HitWaveNext Hit Evolution in Cohesive Sedimentary Environments: Open Problems

A. Sheremet, J. M. Kaihatu, G. W. Stone, X. Zhang


Previous HitWaveNext Hit-current interaction with cohesive sediment is a complex and not fully resolved problem. Contrary to the widely accepted hypothesis that mud-induced Previous HitwaveNext Hit dissipation is important only for long waves, observations show significant damping of high frequency, short waves, which interact weakly with the bottom. The mechanism of short Previous HitwaveNext Hit dissipation is not understood. Numerical simulations show that other dissipative processes such as refraction, or depth-limited breaking, do not account for the magnitude of the observed effects. Independent observations of strong sediment reworking during storms suggest that these effects are related to sediment resuspension processes.

New Previous HitwaveNext Hit-current and turbidity measurements made using the WAVCIS (wavcis.csi.lsu.edu) ocean observing array offshore coastal Louisiana in the northern Gulf of Mexico suggest that sediment concentration distribution in the water column responds fast and varies considerably as a function of Previous HitwaveNext Hit energy. Cohesive sediment is resuspended by waves, reaching an almost constant concentration throughout the water column in high energy states, and resettles to form thick bottom fluid mud layer (low energy states). This effect has been observed before (Allison et al. 2000), but at a much coarser time resolution. The formation of the high-turbidity bottom layer is associated with a marked decrease in both swell and sea energy, suggesting that it might play a role in observed short Previous HitwaveTop dissipation.

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