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Modelling soil detachment capacity by rill flow with hydraulic variables on a simulated steep loessial hillslope
Shen, Nan1; Wang, Zhanli1,2; Zhang, Qingwei1; Chen, Hao1; Wu, Bing2
2019-02-01
Source PublicationHYDROLOGY RESEARCH
ISSN0029-1277
Volume50Issue:1Pages:85-98
Corresponding AuthorWang, Zhanli(zwang@nwsuaf.edu.cn)
AbstractModelling soil detachment capacity by rill flow with hydraulic variables is essential to understanding the rill erosion process and developing physically based rill erosion models. A rill flume experiment with non-erodible flume bed and small soil samples was conducted. Seven flow discharges and six steep slope gradients were combined to produce various flow hydraulics. The soil detachment capacity increases with the increase in slope gradient and flow discharge. The critical slope gradients of 21.26 and 26.79% cause the detachment capacity to increase at a slow pace. The soil detachment capacity can be defined by a power function of flow discharges and slopes. The contribution rates of slope gradient and flow discharge to soil detachment capacity are 42 and 54%, respectively. The soil detachment capacity increases with shear stress, stream power and unit stream power; the increase rates of these parameters are greater under gentle slopes than steep slopes. Stream power is the superior hydrodynamic parameter describing soil detachment capacity. The linear model equation of stream power is stable and reliable, which can accurately predict soil detachment capacity by rill flow on steep loessial hillslopes. This study can help to sufficiently clarify the dynamic mechanism of soil detachment and accurately predict soil detachment capacity for steep loessial hillslopes.
Keywordflume experiment hydraulic parameters rill erosion soil detachment capacity
DOI10.2166/nh.2018.037
WOS KeywordSEDIMENT TRANSPORT ; EROSION MODEL ; CONCENTRATED FLOW ; SUSPENDED SEDIMENT ; OVERLAND-FLOW ; PLATEAU ; SLOPES ; ERODIBILITY ; DISCHARGE ; VELOCITY
Indexed BySCI
Language英语
Funding ProjectNational Natural Science Foundation of China[41471230] ; National Natural Science Foundation of China[41830758] ; National Natural Science Foundation of China[41601282] ; National Natural Science Foundation of China[41171227] ; National Key Research and Development Program of China[2016YFC0402401] ; National Key Research and Development Program of China[2017YFD0800502] ; Special-Funds of Scientific Research Programs of State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau[A314021403-C2]
Funding OrganizationNational Natural Science Foundation of China ; National Key Research and Development Program of China ; Special-Funds of Scientific Research Programs of State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau
WOS Research AreaWater Resources
WOS SubjectWater Resources
WOS IDWOS:000461090000006
PublisherIWA PUBLISHING
Citation statistics
Document Type期刊论文
Identifierhttp://ir.igsnrr.ac.cn/handle/311030/49180
Collection中国科学院地理科学与资源研究所
Corresponding AuthorWang, Zhanli
Affiliation1.Northwest A&F Univ, Inst Soil & Water Conservat, State Key Lab Soil Eros & Dryland Farming Loess P, Yangling 712100, Shaanxi, Peoples R China
2.Chinese Acad Sci & Minist Water Resources, Inst Soil & Water Conservat, State Key Lab Soil Eros & Dryland Farming Loess P, Yangling 712100, Shaanxi, Peoples R China
Recommended Citation
GB/T 7714
Shen, Nan,Wang, Zhanli,Zhang, Qingwei,et al. Modelling soil detachment capacity by rill flow with hydraulic variables on a simulated steep loessial hillslope[J]. HYDROLOGY RESEARCH,2019,50(1):85-98.
APA Shen, Nan,Wang, Zhanli,Zhang, Qingwei,Chen, Hao,&Wu, Bing.(2019).Modelling soil detachment capacity by rill flow with hydraulic variables on a simulated steep loessial hillslope.HYDROLOGY RESEARCH,50(1),85-98.
MLA Shen, Nan,et al."Modelling soil detachment capacity by rill flow with hydraulic variables on a simulated steep loessial hillslope".HYDROLOGY RESEARCH 50.1(2019):85-98.
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