摘要
采用野外模拟降雨试验,对扰动土与原状土的土壤侵蚀规律进行了研究。结果表明,原状土坡面含沙量呈先下降后波动的过程,扰动土径流含沙量在坡度5°,11°时均呈上升—下降后波动的过程。在坡度相同,雨强相近的情况下,扰动土坡面径流含沙量大于原状土。前期原状土产沙量大于扰动土,后期扰动土产沙量大于原状土。扰动土产沙量大于原状土的时间点随着坡度的增加而提前。产沙速率达到稳定后,扰动土产沙速率大于原状土,差距随着坡度的增大而增大。
Erosion processes of disturbed and undisturbed soils were stualea Dy Results showed that sediment concentration for undisturbed soil decreased first and then fluctuated, while sediment concentration for disturbed soil increased first, then decreased and fluctuated at last. At the same slope gradient and rainfall intensity, sediment concentration for disturbed soil was greater than that for un disturbed soil. In early stage, sediment yield for undisturbed soil was greater than that for disturbed soil, whereas in late stage, sediment yield for disturbed soil was greater. The time when sediment yield for undis turbed soil is greater than that for disturbed soil was advanced with increased slope gradient. After a steady state was reached, eroded sediment rate of disturbed soil was greater than that of undisturbed soil and the gap between disturbed and undisturbed soils became larger with increased slope gradient.
出处
《水土保持通报》
CSCD
北大核心
2013年第5期78-81,共4页
Bulletin of Soil and Water Conservation
基金
国家自然科学基金项目"基于小流域淤积信息的侵蚀产沙与侵蚀环境变化响应研究"(40971161)
国家科技支撑项目"黄土高原水土流失综合治理工程关键支撑技术研究"(2006BAD09B02)
关键词
扰动土
原状土
模拟降雨
产沙
disturbed soil
undisturbed soil
simulated rainfall
sediment yield
