摘要
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
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 steepnesses and flow rates. Based on the experiments thus made, a method was advanced to compute the detachment rate of sediment loading water flow, under the assumption that the flow and soil are behaving the same way along rills. Then detachment rates were presented as functions of sediment concentration and rill length.
出处
《农业工程学报》
EI
CAS
CSCD
北大核心
2001年第3期24-27,共4页
Transactions of the Chinese Society of Agricultural Engineering
基金
中国科学院"引进国外杰出人才"资助 !(编号 982 6 0 2 )
