Runoff and soil loss characteristics on loess slopes covered with aeolian sand layers of different thicknesses under simulated rainfall

doi:10.1016/j.jhydrol.2017.04.002

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	Runoff and soil loss characteristics on loess slopes covered with aeolian sand layers of different thicknesses under simulated rainfall
	Xie, L. Y.1; Yang, M. Y.1,2; Zhang, F. B.1,2; Bai, Y. J.1; Li, Z. B.2,3; Wu, X. R.1; Zhang, FB (reprint author), Northwest A&F Univ, Inst Soil & Water Conservat, State Key Lab Soil Eros & Dryland Farming Loess P, Yangling 712100, Shaanxi, Peoples R China.
刊名	JOURNAL OF HYDROLOGY
	2017
卷号	549 页码:244-251
关键词	Sediment Yield Runoff Production Runoff Coefficient Wind-water Erosion Crisscross Region Loess Plateau
ISSN号	0022-1694
DOI	10.1016/j.jhydrol.2017.04.002
文献子类	Article
英文摘要	In the Wind-Water Erosion Crisscross Region of the northern Loess Plateau, parts of loess slopes have been covered by layers of aeolian sand of different thicknesses. Knowledge of soil erosion processes and magnitudes on these slopes is essential to understanding the coupled water-wind erosion processes and to address the resulting downstream coarse sediment problems in the Yellow River. Simulated rainfall (intensity 90 mm h(-1)) was performed to explore the effects of sand layer thickness on runoff and soil loss from loess slopes covered with different sand layer thicknesses (0, 0.5, 2, 5, 10, 15, 20, and 25 cm). Initial runoff time increased with increasing sand layer thickness, with greater changes occurring for the increases in the thinner (0-5 cm) than for the thicker layers (5-25 cm). Total runoff yield from the sand covered loess slopes was 18%-55% lower than from the uncovered loess slope and decreased with increasing sand layer thickness. In contrast, total sediment yield was up to 14 times greater from the sand-covered loess slopes than from the uncovered loess slope and rapidly increased with increasing sand layer thickness. During the rainstorm, runoff and soil loss rates exhibited unimodal distributions, and they were related by a positive linear function, both before and after the maximum soil loss rate, that had a high determination coefficient (R-2 > 0.8, p < 0.05) on loess slopes with sand layer thicknesses greater than 5 cm. The maximum runoff and soil loss rates tended to occur simultaneously and increased abruptly with increasing sand layer thickness. During the rainstorms, some runoff rates on the loess slopes with thicker sand layers were higher than the rainfall intensity due to rainwater combining with water emerging from the saturated sand, which could never occur on the uncovered loess slope. The critical sand layer thickness, which produced a qualitative change in runoff and sediment production modes, appeared to be in the range of 5-10 cm. These results indicated that the thickness of the sand layer on the loess slope significantly influenced runoff and sediment production processes and mechanisms. These effects should be considered when assessing and predicting soil losses in this 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:000403855500019
资助机构	National Natural Science Foundation of China [41571130082, 41371283, 41330858]; National Key Research and Development Program of China [2016YFC0402406] ; National Natural Science Foundation of China [41571130082, 41371283, 41330858]; National Key Research and Development Program of China [2016YFC0402406] ; National Natural Science Foundation of China [41571130082, 41371283, 41330858]; National Key Research and Development Program of China [2016YFC0402406] ; National Natural Science Foundation of China [41571130082, 41371283, 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/361005/7980]
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, Shaanxi, 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, Shaanxi, Peoples R China 2.CAS & MWR, Inst Soil & Water Conservat, Yangling 712100, Shaanxi, Peoples R China 3.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	Xie, L. Y.,Yang, M. Y.,Zhang, F. B.,et al. Runoff and soil loss characteristics on loess slopes covered with aeolian sand layers of different thicknesses under simulated rainfall[J]. JOURNAL OF HYDROLOGY,2017,549:244-251.
APA	Xie, L. Y..,Yang, M. Y..,Zhang, F. B..,Bai, Y. J..,Li, Z. B..,...&Zhang, FB .(2017).Runoff and soil loss characteristics on loess slopes covered with aeolian sand layers of different thicknesses under simulated rainfall.JOURNAL OF HYDROLOGY,549,244-251.
MLA	Xie, L. Y.,et al."Runoff and soil loss characteristics on loess slopes covered with aeolian sand layers of different thicknesses under simulated rainfall".JOURNAL OF HYDROLOGY 549(2017):244-251.