A laboratory study of channel sidewall expansion in upland concentrated flows

doi:10.1016/j.still.2017.12.008

CORC > 水土保持研究所 > 中国科学院水利部水土保持研究所 > 水保所科研产出--SCI > 2018--SCI

	A laboratory study of channel sidewall expansion in upland concentrated flows
	Fenli Zheng 3,6; Chao Qin 3,4; Robert R. Wells 5; Ximeng Xu 3,4; Bin Wang 2; Keyuan Zhong 3; Zheng, FL (reprint author), Inst Soil & Water Conservat, 26 Xinong Rd, Yangling 712100, Shaanxi, Peoples R China.
刊名	SOIL & TILLAGE RESEARCH
	2018
卷号	178 页码:22-31
关键词	Gully Erosion Photogrammetry Basal Scour Tension Crack Non-erodible Layer
ISSN号	0167-1987
DOI	10.1016/j.still.2017.12.008
文献子类	Article
英文摘要	Gully 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.
学科主题	Agriculture
出版地	PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS
语种	英语
出版者	ELSEVIER SCIENCE BV
WOS记录号	WOS:000426223500003
资助机构	National 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 ; National 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
内容类型	期刊论文
源URL	[http://ir.iswc.ac.cn/handle/361005/8263]
专题	水保所科研产出--SCI_2018--SCI
通讯作者	Zheng, FL (reprint author), Inst Soil & Water Conservat, 26 Xinong Rd, Yangling 712100, Shaanxi, Peoples R China.
作者单位	1.MWR, Yangling 712100, Shaanxi, Peoples R China 2.Beijing Forestry Univ, Sch Soil & Water Conservat, Beijing 100083, Peoples R China 3.Northwest A&F Univ, Inst Soil & Water Conservat, State Key Lab Soil Eros & Dryland Farming Loess P, Yangling 712100, Shaanxi, Peoples R China 4.Univ Mississippi, Natl Ctr Computat Hydrosci & Engn, Oxford, MS 38655 USA 5.USDA ARS, Natl Sedimentat Lab, Oxford, MS 38655 USA 6.Chinese Acad Sci, Inst Soil & Water Conservat, Yangling 712100, Shaanxi, Peoples R China
推荐引用方式 GB/T 7714	Fenli Zheng,Chao Qin,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	Fenli Zheng.,Chao Qin.,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	Fenli Zheng,et al."A laboratory study of channel sidewall expansion in upland concentrated flows".SOIL & TILLAGE RESEARCH 178(2018):22-31.