Modelling soil detachment capacity by rill flow with hydraulic variables on a simulated steep loessial hillslope

doi:10.2166/nh.2018.037

	Modelling soil detachment capacity by rill flow with hydraulic variables on a simulated steep loessial hillslope
	Shen, Nan 1; Wang, Zhanli 1,2; Zhang, Qingwei 1; Chen, Hao 1; Wu, Bing 2
刊名	HYDROLOGY RESEARCH
	2019-02-01
卷号	50 期号:1 页码:85-98
关键词	flume experiment hydraulic parameters rill erosion soil detachment capacity
ISSN号	0029-1277
DOI	10.2166/nh.2018.037
通讯作者	Wang, Zhanli(zwang@nwsuaf.edu.cn)
英文摘要	Modelling 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.
资助项目	National 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]
WOS关键词	SEDIMENT TRANSPORT ; EROSION MODEL ; CONCENTRATED FLOW ; SUSPENDED SEDIMENT ; OVERLAND-FLOW ; PLATEAU ; SLOPES ; ERODIBILITY ; DISCHARGE ; VELOCITY
WOS研究方向	Water Resources
语种	英语
出版者	IWA PUBLISHING
WOS记录号	WOS:000461090000006
资助机构	National 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
内容类型	期刊论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/49179]
专题	中国科学院地理科学与资源研究所
通讯作者	Wang, Zhanli
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.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
推荐引用方式 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.