摘要
通过室内放水冲刷试验,结果表明,陡坡单宽径流能耗与单宽径流产沙率之间存在以下线性关系:Dr=18.672(ΔE - 0.751),说明土壤的可蚀性参数为18.672 g/J,发生坡面细沟侵蚀的临界径流能耗为0.751 J/(ms)。坡面单宽径流能耗随流量增大而增加,随坡度变化呈抛物线趋势,临界坡度出现在21和24之间。坡面上各段面单宽径流能耗均随流量的增大而增加,随着坡度逐渐增加,坡面上部段面能耗渐增,中部段面渐减,下部较稳定。坡面各段面侵蚀产沙也有类似特征。此研究对于深入了解黄土高原陡坡土壤侵蚀过程和机理具有重要意义。
The results of runoff scouring experiments show that the relationship between unit width runoff energy consumption and uint width sediment production is Dr=18.672 (ΔE-0.751). The parameter of soil anti-erodibility is 18.672 g/J and the critical energy consumption is 0.751 J/(ms). The unit width runoff energy consumption increased with the flow discharge increasing but changed in parabola form. The critical slope is between 21 and 24. The energy consumption in the upper section of the steep slope increased with the discharge of flow and slope and decreased in the middle section of the slope but stable in low section. The sediment production ratio has the same characteristic. This research may be useful to understand the erosion process and mechanic in steep slope on Loess slope.
出处
《土壤与环境》
CSCD
2002年第4期356-359,共4页
Soil and Environmental Sciences
基金
中国科学院知识创新重大项目(KZCX1-10-04)
