摘要
通过室内冲刷模拟试验对黄土高原陡坡土壤侵蚀特性进行系列研究。结果表明 ,陡坡径流平均流速随径流量和坡度的增大呈波动趋势增加。坡面径流平均含沙率 ,平均输沙率和平均剪切力均随流量的增加波动增加 ,随坡度的增加而呈抛物线形式变化 ,临界坡度值出现在 2 1°和 2 4°之间。坡面径流平均输沙率与平均剪切力之间量良好的线性关系。本研究对深入了解陡坡土壤侵蚀机理 。
The results of runoff scouring experiments show that average flow velocity of steep slope increased with the discharge of flow and slope gradient. The average silt content rate , the average sediment transport rate and the average sheer stress all increased when the discharge of flow increased, they changed in parabolic form with the increase of slope gradient and the critical gradient is between 21°and 24°. The relationship between the average sediment transport rate and the average sheer stress is linear. This research is useful to understand the erosion mechanism of steep slope.
出处
《水土保持研究》
CSCD
2003年第2期47-49,共3页
Research of Soil and Water Conservation
基金
中国科学院知识创重大项目"西部生态环境演变与水土资源可持续利用研究"支持课题编号 KZCX1-10 -0 4
