陡坡细沟含沙水流剥蚀率的试验研究及其计算方法

细沟剥蚀土粒随着细沟股流中含沙量的增加而减少 ,这一概念已在一些侵蚀模型 (如 WEPP)中得到应用。用黄土高原一种典型的粉壤土 ,在 5种坡度 (5°,10°,15°,2 0°,2 5°) ,3种流量 (2 ,4,8L/m in)条件下进行了细沟侵蚀模拟试验 ,试验沟长 0 .5～ 8m。通过 40 5次试验 ,确定了不同坡度、入流量条件下 ,侵蚀产沙量与细沟长度的定量函数关系。在假定细沟径流和土壤侵蚀沿细沟的行为相同条件下 ,提出了一种计算含沙水剥蚀率的方法 ,并进一步表达了细沟剥蚀率随含沙量以及沟长变化的函数关系。实验结果在 15°,2 0°,2 5°时表现出很好的显著性

Soil detachment from rill bed decreases with increase in sediment concentration in the flow, as many erosion models such as WEPP suggested. Using a typical silt clay soil from the Loess Plateau, a series of 405 flume experiments were conducted, on slopes of 5°, 10°, 15°, 20° and 25°, flow rates of 2, 4, 8 L/min and rill lengths of 0.5, 1, 2, 3, 4, 5, 6, 7, 8 m, with 3 replicates for each to determine quantitatively the relationships between sediment load of water flow and rill length under different slope ...