Experiments on Deposition Behavior of Fine Sediment in a Reservoir
Publication: Journal of Hydraulic Engineering
Volume 126, Issue 12
Abstract
The deposition behavior of fine sediment is an important phenomenon, and yet it is unclear to engineers concerned about reservoir sedimentation. Laboratory experiments were conducted to produce both quasi-homogeneous flow and a turbidity current region divided by a plunge section. Silica powder (a noncohesive sediment) and kaolin (a cohesive sediment) were used as the suspended material. Because the effective gravitational force is the primary driving force for velocity in turbidity currents, the velocity profile was closely related to the concentration profile. The deposition rate of noncohesive coarser particles exponentially decays along the flow path. Most of the coarser particles were deposited in the quasi-homogeneous flow region or within a small distance downstream of the plunge section. The plunge did not carry those coarser particles further downstream. Deposition in the region of the turbidity current was found mainly by cohesive particles. Hydraulic sorting exists in the quasi-homogeneous flow region for noncohesive coarser particles, but becomes less significant in the downstream portion with deposition rates becoming mildly decayed. For fine cohesive particles, hydraulic sorting for the deposited gradation is not significant.
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Information & Authors
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Published In
Journal of Hydraulic Engineering
Volume 126 • Issue 12 • December 2000
Pages: 912 - 920
History
Received: Feb 25, 1999
Published online: Dec 1, 2000
Published in print: Dec 2000
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