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	Interrill soil erosion processes on steep slopes
	Wang, Z. L.2,3; Zhang, X. C. (John)4; Wang, ZL (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	548页码:652-664
关键词	Interrill Erosion Process Interrill Erosion Modeling Soil Detachment Sediment Transport
ISSN号	0022-1694
DOI	10.1016/j.jhydrol.2017.03.046
文献子类	Article
英文摘要	To date interrill erosion processes are not fully understood under different rainfall and soil conditions. The objectives are to 1) identify the interrill erosion regime and limiting process under the study condition, 2) characterize the interactive effects of rainfall intensity and flow depth on sediment transport competency and mode, and 3) develop a lumped interrill erosion model. A loess loam soil with 39% sand and 45% silt was packed to flumes and exposed to simulated rainfall. A complete factorial design with three factors was used, which included rainfall intensity (48, 62, 102, 149, and 170 mm h(-1)), slope gradient (17.6, 26.8, 36.4, 46.6, and 57.7%), and slope length (0.4, 0.8, 1.2, 1.6, and 2 m). Rain splash, sediment discharge in runoff, and flow velocity were measured. Results showed that rainfall intensity played a dual role not only in detaching soil materials but also in enhancing sediment transport. Sediment transport was the process limiting interrill erosion rate under the study condition. Two major sediment transport modes were identified: rainfall-driven rolling/creeping and flow-driven rolling/sliding. The relative importance of each mode was largely determined by flow depth. The competence of the flow in transporting sediment decreased downslope as flow depth increased due to increased dissipation of raindrop energy. The optimal mean flow depth for the maximal interrill erosion rates was <0.1 mm, which is much shallower than the widely reported 2 mm. Slope length was negatively related to interrill erosion rate. The negative correlation seemed stronger for heavier rains, indicating the cushioning effects of flow depth. Lumped interrill erosion models, developed from short slopes, are likely to overestimate erosion rates. Given transport as the limiting process, the so called erodibility value, estimated with those models, is indeed sediment transportability under the study condition. The effects of slope length on interrill erosion regimes need to be studied further under a wider range of conditions. (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:000403739000050
资助机构	National Natural Science Foundation of China [41471230, 41171227] ; National Natural Science Foundation of China [41471230, 41171227] ; National Natural Science Foundation of China [41471230, 41171227] ; National Natural Science Foundation of China [41471230, 41171227]
内容类型	期刊论文
源URL	[http://ir.iswc.ac.cn/handle/361005/7996]
专题	水保所科研产出--SCI_2017--SCI
通讯作者	Wang, ZL (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.Minist Water Resources, Yangling 712100, Shaanxi, Peoples R China 2.Northwest A&F Univ, Inst Soil & Water Conservat, State Key Lab Soil Eros & Dryland Farming Loess P, Yangling 712100, Shaanxi, Peoples R China 3.Chinese Acad Sci, Inst Soil & Water Conservat, Yangling 712100, Shaanxi, Peoples R China 4.USDA ARS, Grazinglands Res Lab, 7207 West Cheyenne St, El Reno, OK 73036 USA
推荐引用方式 GB/T 7714	Wang, Z. L.,Zhang, X. C. ,Wang, ZL . Interrill soil erosion processes on steep slopes[J]. JOURNAL OF HYDROLOGY,2017,548:652-664.
APA	Wang, Z. L.,Zhang, X. C. ,&Wang, ZL .(2017).Interrill soil erosion processes on steep slopes.JOURNAL OF HYDROLOGY,548,652-664.
MLA	Wang, Z. L.,et al."Interrill soil erosion processes on steep slopes".JOURNAL OF HYDROLOGY 548(2017):652-664.

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