上方来水来沙对细沟侵蚀产沙过程的影响

Effect of Run on Water and Sediment on Rill Erosion Process at Down slope Section

利用双土槽系统径流小区 (供沙土槽和试验土槽 ) ,定量研究了不同上方来水含沙量和不同降雨强度下 15°坡面上方来水来沙对坡下方细沟侵蚀产沙过程的影响。结果表明 ,坡上方来沙量不但被径流全部搬运 ,且坡上方来水在坡下方细沟侵蚀槽引起另外的侵蚀产沙量 S。坡面细沟侵蚀过程以侵蚀—搬运过程为主。上方来水对细沟侵蚀产沙的贡献受上方来水含沙量和降雨强度的影响。降雨强度的增加或上方来水含沙量的减少 ,使

A dual box system (one is rill box and the other is feeder box) with 15 gradient and clay loess is used to quantify effects of runoff and sediment from up slope on down slope rill erosion and sediment under different sediment concentrations and rainfall intensities. The experiment results showed that the sediment from up slope was completely transported, runoff from up slope caused the additional sediment delivery at down slope rill erosion channel. Sediment regime in rill erosion process was always detachment-transport. The additional sediment delivery caused by up slope runoff increased with a decrease of sediment concentration in up slope runoff or an increase of rainfall intensity.