Effects of slope gradient on hydro-erosional processes on an aeolian sand-covered loess slope under simulated rainfall

doi:10.1016/j.jhydrol.2017.08.019

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	Effects of slope gradient on hydro-erosional processes on an aeolian sand-covered loess slope under simulated rainfall
	Yang, M. Y.1,2; Zhang, F. B.1,2; Li, B. B.4; Li, Z. B.2,3; Shi, W. Y.5; Zhang, FB (reprint author), Northwest A&F Univ, Inst Soil & Water Conservat, State Key Lab Soil Eros & Dryland Farming Loess P, Yangling 712100, Shannxi Provinc, Peoples R China.
刊名	JOURNAL OF HYDROLOGY
	2017
卷号	553 页码:447-456
关键词	Soil Loss Runoff Sand Layer Slope Gradient Wind-water Erosion Crisscross Region
ISSN号	0022-1694
DOI	10.1016/j.jhydrol.2017.08.019
文献子类	Article
英文摘要	The aeolian sand-covered loess slope of the Wind-Water Erosion Crisscross Region of the Loess Plateau in China may play a key role in contributing excessive sediment to the Yellow River. Understanding its hydro-erosional processes is crucial to assessing, controlling and predicting soil and water losses in this region and maintaining the ecological sustainability of the Yellow River. Simulated rainfall (intensity 90 mm h-1) was used to investigate the runoff and soil loss from loess slopes with different slope gradients (18%, 27%, 36%, 47%, and 58%) and overlying sand layer thicknesses (0, 5 and 10 cm). As compared with uncovered loess slopes, an overlying sand layer delayed runoff production, reduced cumulative runoff and increased cumulative soil loss, as well as enhancing variations among slope gradients. Cumulative runoff and soil loss from the sand-covered loess slopes increased with increasing slope gradients and then slightly decreased, with a peak at about 47% gradient; they both were greater from the 10-cm sand-covered loess slope than from the 5-cm except for with 18% slope gradient. In general, differences in cumulative runoff between sand layer thicknesses became smaller, while those in cumulative soil loss became larger, with increasing slope gradient. Runoff and soil loss rates on the sand-covered loess slopes exhibited unimodal distributions during the rainstorms. Maximum values tended to occur at the same rain duration, and increased considerably with increasing slope gradient and sand layer thickness on slopes that were less than 47%. Liquefaction process might occur on the lower loess slopes covered with thinner sand layers but failures similar to shallow landslides might occur when the sand layer was thicker on steeper slopes. The presence of an overlying sand layer changed the relationship between runoff and soil loss rates during intense rainstorms and this change varied with different slope gradients. Our results demonstrated that the effects of slope gradient on hydro-erosional processes on the sand-covered loess slopes were important and vary with changing sand thickness. These effects should be considered when assessing and predicting soil losses from such slopes in the study region and from similar slopes elsewhere. (C) 2017 Elsevier B.V. All rights reserved.
学科主题	Engineering ; Geology ; Water Resources
URL标识	查看原文
出版地	AMSTERDAM
语种	英语
出版者	ELSEVIER SCIENCE BV
WOS记录号	WOS:000412612700035
资助机构	National Natural Science Foundation of China [41371283, 41571130082, 41330858]; National Key Research and Development Program of China [2016YFC0402406] ; National Natural Science Foundation of China [41371283, 41571130082, 41330858]; National Key Research and Development Program of China [2016YFC0402406] ; National Natural Science Foundation of China [41371283, 41571130082, 41330858]; National Key Research and Development Program of China [2016YFC0402406] ; National Natural Science Foundation of China [41371283, 41571130082, 41330858]; National Key Research and Development Program of China [2016YFC0402406]
内容类型	期刊论文
源URL	[http://ir.iswc.ac.cn/handle/361005/7909]
专题	水保所科研产出--SCI_2017--SCI
通讯作者	Zhang, FB (reprint author), Northwest A&F Univ, Inst Soil & Water Conservat, State Key Lab Soil Eros & Dryland Farming Loess P, Yangling 712100, Shannxi Provinc, Peoples R China.
作者单位	1.Northwest A&F Univ, Inst Soil & Water Conservat, State Key Lab Soil Eros & Dryland Farming Loess P, Yangling 712100, Shannxi Provinc, Peoples R China 2.Chinese Acad Sci, Inst Soil & Water Conservat, Yangling 712100, Shaanxi, Peoples R China 3.MWR, Yangling 712100, Shaanxi, Peoples R China 4.Beijing Water Sci & Technol Inst, Beijing 100048, Peoples R China 5.Southwest Univ, Chongqing Key Lab Karst Environm, Sch Geog Sci, Chongqing 400715, Peoples R China 6.Xian Univ Technol, State Key Lab Base Ecohydraul Engn Arid Area, Xian 710048, Shaanxi, Peoples R China
推荐引用方式 GB/T 7714	Yang, M. Y.,Zhang, F. B.,Li, B. B.,et al. Effects of slope gradient on hydro-erosional processes on an aeolian sand-covered loess slope under simulated rainfall[J]. JOURNAL OF HYDROLOGY,2017,553:447-456.
APA	Yang, M. Y.,Zhang, F. B.,Li, B. B.,Li, Z. B.,Shi, W. Y.,&Zhang, FB .(2017).Effects of slope gradient on hydro-erosional processes on an aeolian sand-covered loess slope under simulated rainfall.JOURNAL OF HYDROLOGY,553,447-456.
MLA	Yang, M. Y.,et al."Effects of slope gradient on hydro-erosional processes on an aeolian sand-covered loess slope under simulated rainfall".JOURNAL OF HYDROLOGY 553(2017):447-456.