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首页> 美国政府科技报告 >Current Dynamics and Sediment Distribution in the West Mississippi Delta Area.
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Current Dynamics and Sediment Distribution in the West Mississippi Delta Area.

机译：西密西西比三角洲地区的动态和泥沙分布。

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摘要

The dynamic oceanography of the coastal bight west of Southwest Pass (an area extending roughly 50 km offshore and 70 km alongshore) was studied over the hydrologic year 1973-1974. Analysis of current observations from moored current meters and monthly anchor stations isolated clockwise-rotating tidal currents having amplitudes of 10-30 cm/sec, depending on location and vertical density gradients. Extremely strong tidal currents in the vicinity of Southwest Pass appear to be related to the early arrival of high water locally. Current profiles at the anchor stations often show significant vertical shear in speed and direction which is probably controlled by the density stratification. The spatial pattern of the tidal currents consists predominantly of reversing alongshore flow with significant shear in the onshore-offshore direction. Drogue tracks, etc., frequently show a trapped vortex west of the delta with onshore flows in the western extremity. Conversely, monthly hydrographic cruises on a dense grid suggest that heavy Gulf water persistently intrudes at depth into the central core of the curved bight. Although subject to strong dispersive processes, the sediment pattern nevertheless appears to be largely controlled by the mean current field produced by seasonal wind and river discharge effects.

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