Effect of Turbidity Currents on Sedimentation Process in Sefidroud Dam

آب و خاک

Article 19, Volume 25, Issue 4, September 2011   

Document Type: Research Article

DOI: 10.22067/jsw.v0i0.10250

Authors

Y. Ramezani^{* 1}; M. Ghomeshi²

¹Birjand university

²Department of Hydraulic Structures, Faculty of Water Sciences Engineering, Shahid Chamran University of Ahvaz

Abstract

Abstract
Turbidity current is one of the most important factors that effect the sediments distribution and also their transportation and release from reservoir. In this study, effects of these currents on sedimentation process in Sefidroud dam were simulated by TCM model in 30 years period. Comparison between the case of turbidity currents that reach to the dam wall and release from the reservoir, and the case of neglecting the effects of these currents (all sediments deposit approximately) were conducted. The results show that in the case of releasing the turbidity currents from the reservoir, the trap efficiency of Ghazalozan branch would decrease about 30 percent in comparison with the other case. Also, this reduction would be about 20 percent in Shahroud branch. Comparison between the two cases of operations show that the average of annual volume reduction of the Ghazalozan branch would decrease from 1.07 to 0.73 and 0.55 to 0.43 in Shahroud branch, if Turbidity currents release from the reservoir.

Keywords: Reservoir Sedimentation, Turbidity Current, Trap Efficiency, Sefidroud Dam, TCM Model