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Abstract of the Article

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Determination of the Fall Velocity for Cohesive Sediments at Different Concentrations

Authors:
[ Ali Arman ] - Asc student , Faculty of water science Engineering , Chamran university of Ahvaz
[ Manuchehr Fathi Moghadam ] - Assistant Professor, Faculty of water science Engineering , Chamran university of Ahvaz
[ Hossein Samadi Boroujeni ] - Assistant professor, Department of water Engineering , Faculty of Agriculture , Shahrekord University

Abstract:

In most sediment studies, settling columns are used in order to determine the sediment physical parameters in stagnant water. Of these parameters one is sediment fall velocity. Extensive studies have been conducted in the past regarding this parameter for non-cohsive sediments while a few scholars as McLaughlin (1959), Krone (1963) and Krishnappan (2000) have dealt with this parameter in cohesive sediments. In the present study to calculate the fall velocity in cohesive sediments, a 3m high settling column of water and sediment mixture was formed and representative samples were taken at different depths and using existing equations and relative diagrams fall velocity in cohesive sediments was determined. The results showed that flocculation occurs at the depths of 60 to 90 cm.

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