Sediment Trapping from Hyperconcentrated Flow as Affected by Grass Filter Strips  

作　　者：ZHOU Zheng-Chao GAN Zhuo-Ting SHANGGUAN Zhou-Ping 

机构地区：[1]Department of Tourism and Environmental Sciences, Shaanxi Normal University [2]Key Laboratory of Disaster Survey and Mechanism Simulation of Shaanxi Province, Baoji University of Arts and Sciences [3]State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Institute of Soil and Water Conservation, Chinese Academy of Sciences

出　　处：《Pedosphere》2013年第3期372-375,共4页土壤圈（英文版）

基　　金：Supported by the National Natural Science Foundation of China (No. 40901131);the Fundamental Research Funds for the Central Universities of China (No. GK201103003)

摘　　要：To evaluate the effect of vegetative filter strips on sediment trapping, the spatial distribution of deposited sediment, and the size distribution of deposited particles from hyperconcentrated flows, a simulated grass filter strip experiment was conducted with plastic grass using an adjustable slope steel flume. The simulated vegetation cover was 36%, and the inflow sediment concentrations applied were 147, 238, 320, and 429 kg m^(-3). The sediment concentration in the outflow, and the sediment particle size were determined. The results showed that the grass filter strips trapped most of the sediment from inflow at low sediment concentration. The deposition efficiency decreased with increasing sediment concentration, being 55.2% and 15.7% in the 147 and 429 kg m^(-3)sediment treatments, respectively. Most of the deposited sediments were distributed in the upper flume. In addition, the grass filter strips mainly trapped the coarse sediment (particle size>10 μm).To evaluate the effect of vegetative filter strips on sediment trapping, the spatial distribution of deposited sediment, and the size distribution of deposited particles from hyperconcentrated flows, a simulated grass filter strip experiment was conducted with plastic grass using an adjustable slope steel flume. The simulated vegetation cover was 36%, and the inflow sediment concentrations applied were 147, 238, 320, and 429 kg m-3. The sediment concentration in the outflow, and the sediment particle size were determined. The results showed that the grass filter strips trapped most of the sediment from inflow at low sediment concentration. The deposition efficiency decreased with increasing sediment concentration, being 55.2% and 15.7% in the 147 and 429 kg m-3 sediment treatments, respectively. Most of the deposited sediments were distributed in the upper flume. In addition, the grass filter strips mainly trapped the coarse sediment （particle size 〉 10 μm）.

关 键 词：EROSION Loess Plateau sediment particles vegetation cover 

分 类 号：S812.2[农业科学—草业科学]