Correction factor for rill flow velocity measured by the dye tracer method under varying rill morphologies and hydraulic characteristics

doi:10.1016/j.jhydrol.2020.125560

	Correction factor for rill flow velocity measured by the dye tracer method under varying rill morphologies and hydraulic characteristics
	Yang, D. M.1,2; Fang, N. F.1; Shi, Z. H.1,3,4
刊名	JOURNAL OF HYDROLOGY
	2020-12-01
卷号	591 页码:12
关键词	Rill erosion Flow velocity Dye tracer method Correction factor Rill morphology
ISSN号	0022-1694
DOI	10.1016/j.jhydrol.2020.125560
通讯作者	Shi, Z. H.(shizhihua70@gmail.com)
英文摘要	Flow velocity is an important parameter for rill erosion process studies. The dye tracer method is the most widely used method for measuring rill flow velocity, but the influential factors and reasonable values of the correction factor alpha remain uncertain. Therefore, the experimental datasets from different studies were used to evaluate the a values from the previous studies could be applied to calculate the mean velocity of rill flow, and a detailed laboratory study was conducted to investigate the effects of rill morphology and hydraulic characteristics on the a of rill flow. The slope gradients varied from 5 to 25 degrees, flow discharges from 2 to 8 L min(-1), and Reynolds numbers from 172 to 1040. The surface velocity was measured by the dye tracer method, and the mean velocity was derived indirectly from the flow depth measurements. The results showed that a single alpha value was not suitable for rill flow velocity measurement. The alpha values of rill-free flow and rill flow ranged from 0.295 to 0.729 and from 0.330 to 0.990, respectively. The effect of the slope gradient on the alpha of rill-free flow was noticeably different from that of rill flow, and the alpha of this study increased with increasing Reynolds number. For the rill-free flow, alpha could be estimated with a logarithmic function of the slope gradient and Reynolds number (R-2 = 0.930, NSE = 0.930). For rill flow, a increased linearly with increasing rill width, depth and cross-sectional area. The value of alpha could be estimated with an equation of the rill depth and Reynolds number (R-2 = 0.811, NSE = 0.811). The results of this study provide a reference for rill flow velocity measurement using the dye tracer method.
资助项目	National Natural Science Foundation of China[41525003] ; Strategic Priority Research Program of Chinese Academy of Sciences[XDB 40020100]
WOS关键词	SHALLOW-WATER FLOW ; SOIL-EROSION ; SEDIMENT TRANSPORT ; MODELING SEDIMENT ; OVERLAND-FLOW ; MEAN VELOCITY ; BED ROUGHNESS ; SALTATING SEDIMENT ; SLOPE ; RESISTANCE
WOS研究方向	Engineering ; Geology ; Water Resources
语种	英语
出版者	ELSEVIER
WOS记录号	WOS:000599757800071
资助机构	National Natural Science Foundation of China ; Strategic Priority Research Program of Chinese Academy of Sciences
内容类型	期刊论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/137670]
专题	中国科学院地理科学与资源研究所
通讯作者	Shi, Z. H.
作者单位	1.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 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 3.Huazhong Agr Univ, Coll Resources & Environm, Wuhan 430070, Peoples R China 4.CAS Ctr Excellence Quaternary Sci & Global Change, Xian 710061, Peoples R China
推荐引用方式 GB/T 7714	Yang, D. M.,Fang, N. F.,Shi, Z. H.. Correction factor for rill flow velocity measured by the dye tracer method under varying rill morphologies and hydraulic characteristics[J]. JOURNAL OF HYDROLOGY,2020,591:12.
APA	Yang, D. M.,Fang, N. F.,&Shi, Z. H..(2020).Correction factor for rill flow velocity measured by the dye tracer method under varying rill morphologies and hydraulic characteristics.JOURNAL OF HYDROLOGY,591,12.
MLA	Yang, D. M.,et al."Correction factor for rill flow velocity measured by the dye tracer method under varying rill morphologies and hydraulic characteristics".JOURNAL OF HYDROLOGY 591(2020):12.