Bed Sediments Size Changes, Atchafalaya River

by C. W. Soileau, US Army Corps of Engineers, New Orleans, United States,
R. E. Rentschler, US Army Corps of Engineers, New Orleans, United States,
F. L. Ogden, US Army Corps of Engineers, New Orleans, United States,
C. F. Nordin, US Army Corps of Engineers, New Orleans, United States,



Document Type: Proceeding Paper

Part of: Hydraulic Engineering

Abstract:

During low flows of 1989 and 1991, we collected bed sediment samples from the thalwegs of the Mississippi River from Cairo, Illinois, to Head of Passes and along the Atchafalaya River from Old River to the Gulf. The median diameters of bed sediments have not changed much since 1932, when a similar sampling program was carried out by the Corps of Engineers, but the shapes of the distribution curves are different. The recent samples contain less coarse sand and gravel and less very fine sand than did the earlier samples. Along the Atchafalaya, sand now extends all the way to the gulf, whereas in earlier samples, the bed sediments were mostly silt and clay along the lower part of the reach.

Subject Headings: Soil analysis | Soil water | Sediment | Bed materials | Rivers and streams | River and stream beds | Clays | Mississippi River | Illinois | United States

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