Experimental Study on the Uniform Natural Sand Recovery Process by Unsaturated Flow

Xiaohu Guo, Yonghui Zhu, Geng Qu, Dong Chen

Abstract


Sediment concentrations would not be saturation after the construction of the reservoir, causing the long distance erosion; these will bring a series of problems, such as flood control, water resource utilization and shipping, because of scouring process complexity, the sediment concentration recovery was one of the difficult problems in the river sediment dynamics. In this paper, based on full study of current research, the theoretical formula of the recovery about the sediment concentration was derived, by use of experiments in the equipped with advanced apparatus such as Type-B Ultrasonic Sediment Instrument, the recovery process of suspended sediment under different conditions was clarified. When the flow and bed particle size were constant, the channel slopes were 0.5/1000, 1/1000 and 2/1000, and small differences was shown in the process of the sediment concentration recovery, 1  (The ratio of near bottom and vertical average sediment concentration) was a process that was gradually close to 2  (The ratio of near bottom and vertical average Sediment carrying capacity)during the scouring process; When the bed particle size and channel slope were constant, the greater the flow, the greater the distance of the sediment concentration recovery, also the larger 1  、2  value; When the flow, channel slope were constant, the finer the particle size, the greater the value and distance of the sediment concentration recovery, and vice versa.


DOI
10.12783/dtetr/apetc2017/11287

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