Journal of Food, Agriculture and Environment

Effects of obstacle heights on controlling turbidity currents with different concentrations and discharges

Author(s):

S. A. Asghari Pari, S. M. Kashefipour ^*, M. Ghomeshi, M. Shafaie Bajestan

Recieved Date: 2010-01-11, Accepted Date: 2010-04-09

Abstract:

Turbidity currents are important phenomena involved in sediment processes in large reservoirs. Using an obstacle in dam reservoir with the objective of complete or relative blockage, diversion or dissipation of turbidity current may result in reducing sediment deposition near dam wall and therefore increased dam lifetime. This technique is commonly used in controlling two-layer flow in fields such as climatology; however, it has been used to control reservoir sedimentation in recent decade. This paper investigates the effects of obstacle heights of a physical setup on controlling of turbidity currents with various inflow characteristics. First, a turbidity current with different concentrations and discharges without using an obstacle was measured along a flume and the height required to block the turbidity current was determined by taking into account flow conditions and other results reflected in the literature. Then, by using the obstacle with varying heights the effects on the turbidity current were studied. The results showed that in sub-critical currents to block the current completely the height of obstacle should be 2 to 2.75 times of the current body depth.

Keywords:

Turbidity current, dam reservoir, sediment transport, sedimentation control, physical model

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Journal: Journal of Food, Agriculture and Environment
Year: 2010
Volume: 8
Issue: 2
Category: Environment
Pages: 930-935

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