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A laboratory study of channel sidewall expansion in upland concentrated flows
Chao Qin1,2; Fenli Zheng1,4; Robert R. Wells3; Ximeng Xu1,2; Bin Wang6; Keyuan Zhong1; Zheng, FL (reprint author), Inst Soil & Water Conservat, 26 Xinong Rd, Yangling 712100, Shaanxi, Peoples R China.
SubtypeArticle
2018
Source PublicationSOIL & TILLAGE RESEARCH
ISSN0167-1987
description.correspondentemailflzh@ms.iswc.ac.cn ; robert.wells@ars.usda.gov ; xuam@nwsuaf.edu.cn ; wangbin1836@bjfu.edu.cn ; zkygeo@163.com
Volume178Pages:22-31
AbstractGully erosion contributes large amounts of sediment within watersheds around the world. Gully widening constitutes about 80% of total soil loss, especially in the presence of a plow pan which manifests a less or non erodible soil layer. Current knowledge on sidewall toe scour (scour arcs) and tension crack processes in gully widening is limited. Thus, simulated channel sidewall expansion tests, where the channel bed was fixed to represent a non-erodible layer, were designed to investigate how inflow rate, slope gradient and initial channel width affect channel widening processes. Soil boxes (2.0 m-long, 0.3 m-wide and 0.5 m-deep) with two slope gradients (15 degrees and 20 degrees), four inflow rates (1.0, 2.0, 3.0 and 4.0 L min(-1)) and two initial channel widths (4 and 8 cm) were subjected to clear-water overland flow. Photogrammetry was used to detect tension crack and width variations of channels. The results show that sediment delivery and channel width increase with the increase of inflow rate, bed slope and the decrease of initial channel width. Exponential equations were used to predict the channel width time series. Time lag occurred between sediment peak and soil block failure. Toe scour, crack development, sidewall failure and block detachment and transport, in sequence, were the four main processes of channel widening. Basal scour arc length, tension crack length and width decreased with initial channel width and increased with time, flow discharge and bed slope. Basal scour arcs were divided into three patterns according to different shapes in comparison to the failure arcs. Sediment delivery equations based on the disaggregation of concentrated flow entrainment and mass failure were also fitted. This study provides new insight on improving gully erosion measurements and prediction technology.
KeywordGully Erosion Photogrammetry Basal Scour Tension Crack Non-erodible Layer
Subject AreaAgriculture
DOI10.1016/j.still.2017.12.008
Indexed BySCI
Publication PlacePO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS
Language英语
WOS IDWOS:000426223500003
PublisherELSEVIER SCIENCE BV
Funding OrganizationNational Natural Science Foundation of China [41271299, 4171101192] ; National Natural Science Foundation of China [41271299, 4171101192] ; Opening Funds of MWR Key Laboratory of Soil and Water Loss Process and Control in the Loess Plateau [2017001] ; Opening Funds of MWR Key Laboratory of Soil and Water Loss Process and Control in the Loess Plateau [2017001] ; Special-Funds of Scientific Research Programs of State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau [A314021403-C2] ; Special-Funds of Scientific Research Programs of State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau [A314021403-C2] ; External Cooperation Program of Chinese Academy of Sciences [161461KYSB20170013] ; External Cooperation Program of Chinese Academy of Sciences [161461KYSB20170013] ; China Scholarship Council funds ; China Scholarship Council funds
Citation statistics
Cited Times:6[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.iswc.ac.cn/handle/361005/8263
Collection水保所科研产出--SCI_2018--SCI
Corresponding AuthorZheng, FL (reprint author), Inst Soil & Water Conservat, 26 Xinong Rd, Yangling 712100, Shaanxi, Peoples R China.
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.Univ Mississippi, Natl Ctr Computat Hydrosci & Engn, Oxford, MS 38655 USA
3.USDA ARS, Natl Sedimentat Lab, Oxford, MS 38655 USA
4.Chinese Acad Sci, Inst Soil & Water Conservat, Yangling 712100, Shaanxi, Peoples R China
5.MWR, Yangling 712100, Shaanxi, Peoples R China
6.Beijing Forestry Univ, Sch Soil & Water Conservat, Beijing 100083, Peoples R China
Recommended Citation
GB/T 7714
Chao Qin,Fenli Zheng,Robert R. Wells,et al. A laboratory study of channel sidewall expansion in upland concentrated flows[J]. SOIL & TILLAGE RESEARCH,2018,178:22-31.
APA Chao Qin.,Fenli Zheng.,Robert R. Wells.,Ximeng Xu.,Bin Wang.,...&Zheng, FL .(2018).A laboratory study of channel sidewall expansion in upland concentrated flows.SOIL & TILLAGE RESEARCH,178,22-31.
MLA Chao Qin,et al."A laboratory study of channel sidewall expansion in upland concentrated flows".SOIL & TILLAGE RESEARCH 178(2018):22-31.
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