Effect of rainfall regime and slope on runoff in a gullied loess region on the loess plateau in China

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	Effect of rainfall regime and slope on runoff in a gullied loess region on the loess plateau in China
	Fang H. Y. ; Cai Q. G. ; Chen H. ; Li Q. Y.
	2008
关键词	Agglomeration Catchments Chlorine compounds Groundwater Moisture determination Silt Soil moisture
英文摘要	Runoff was measured from seven plots with different slopes nested in Tuanshangou catchment on the Loess Plateau to study effect of slopes on runoff in relation to rainfall regimes. Based on nine years of field observation and K-mean clusters, 84 rainfall events were grouped into three rainfall regimes. Rainfall regime A is the group of events with strong rainfall intensity, high frequency, and short duration. Rainfall regime C consists of events with low intensity, long duration, and infrequent occurrence. Rainfall regime B is the aggregation of events of medium intensity and medium duration, and less frequent occurrence. The following results were found: (1) Different from traditional studies, runoff coefficient neither decreased nor increased, but presented peak value on the slope surfaces; (2) For individual plot, runoff coefficients induced by rainfall regime A were the highest, and those induced by rainfall regime C were the lowest; Downslope, the runoff coefficients induced by three rainfall regimes presented the same changing trend, although the peak value induced by regime A occurred on a shorter slope length compared to those by regime B and C; (3) Scale effect on runoff induced by rainfall regime A was the least, and that induced by rainfall regime C was the largest. These results can be explained by the interactions of crusting, soil moisture content, slope length and gradient, and erosion units, etc., in the context of different rainfall regimes. © 2008 Springer Science+Business Media, LLC.
出处	Environmental Management
卷	42 期:3 页:402-411
收录类别	EI
语种	英语
内容类型	EI期刊论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/24941]
专题	地理科学与资源研究所_历年回溯文献
推荐引用方式 GB/T 7714	Fang H. Y.,Cai Q. G.,Chen H.,et al. Effect of rainfall regime and slope on runoff in a gullied loess region on the loess plateau in China. 2008.