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A simulation of rill bed incision processes in upland concentrated flows
Chao Qin1,2; Fenli Zheng1,3; Xunchang J. Zhang5; Ximeng Xu1,2; Gang Liu1,3; Zheng, FL (reprint author), Inst Soil & Water Conservat, 26 Xinong Rd, Yangling 712100, Shaanxi, Peoples R China.
SubtypeArticle
2018
Source PublicationCATENA
ISSN0341-8162
description.correspondentemailglginchao@nwsuaf.edu.cn ; flzh@ms.iswc.ac.cn ; john.zhang@ars.usda.gov ; xuxm@nwsuaf.edu.cn
Volume165Pages:310-319
AbstractQuantifying rill bed incision provides fundamental information for process-based erosion modeling; while the morphodynamic and hydrodynamic mechanism in bed incision processes are still unclear. Thus, experiments were conducted to examine rill bed incision processes in upland concentrated flows. DEMs (2 mm x 2 mm resolution) obtained by photogrammetry were used for sill bed morphology analysis. Rill channel (2.0 m-long, 0.08 m-wide and 0.15 m-deep) with two slope gradients (15 degrees and 20 degrees) were subjected to four overland flow rates (1.0, 2.0, 3.0 and 4.0 L min(-1)). The results showed that sediment delivery, rill bed incision rate and average rill depth increased with inflow rate and bed slope. Sediment delivery increased from 0.060 to 0.226 kg min(-1) per 1 L min(-1) inflow increment and from 0.043 to 0.207 kg min(-1) when bed slope increased from 15 degrees to 20 degrees. In a well-developed rill channel, rill bed incision could be divided into three phases: pre-headcut formation (dominated by rill flow shear stress), headcut incision (dominated by headcut advancing) and post-headcut incision (dominated by rill flow shear stress). Headcut incision phase, which only accounted for < 15% of total experimental time, produced > 65% of rill bed sediment. In the pre-headcut formation phase, rill flow velocity, shear stress and stream power increased with increases of inflow rate and slope gradient. Conversely, flow velocity showed no evident trend with increased inflow rate and bed slope during headcut incision phase. Initial headcut advancing rate could be predicted by a non-linear function based upon soil characteristics, rill flow shear stress and headcut height. Sediment delivery showed a power function with the product of inflow rate and squared bed slope. Because rill bed incision is dominated by headcut advancement and incision, practices for controlling headcut initiation should be implemented to decrease hillslope soil loss.
KeywordSoil Erosion Rill Bed Incision Headcut Photogrammetry
Subject AreaGeology ; Agriculture ; Water Resources
DOI10.1016/j.catena.2018.02.013
Indexed BySCI
Publication PlacePO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS
Language英语
WOS IDWOS:000430994900031
PublisherELSEVIER SCIENCE BV
Funding OrganizationInternational Partnership Program of Chinese Academy of Sciences [161461KYSB20170013] ; International Partnership Program of Chinese Academy of Sciences [161461KYSB20170013] ; National Natural Science Foundation of China [41761144060] ; National Natural Science Foundation of China [41761144060] ; MWR Key Laboratory of Soil and Water Loss Process and Control in the Loess Plateau [2017001] ; MWR Key Laboratory of Soil and Water Loss Process and Control in the Loess Plateau [2017001] ; China Scholarship Council ; China Scholarship Council
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Cited Times:1[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.iswc.ac.cn/handle/361005/8241
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 Loes, Yangling 712100, Shaanxi, Peoples R China
2.Univ Mississippi, Natl Ctr Computat Hydrosci & Engn, Oxford, MS 38655 USA
3.Chinese Acad Sci, Inst Soil & Water Conservat, Yangling 712100, Shaanxi, Peoples R China
4.MWR, Yangling 712100, Shaanxi, Peoples R China
5.USDA ARS, Grazinglands Res Lab, El Reno, OK 73036 USA
Recommended Citation
GB/T 7714
Chao Qin,Fenli Zheng,Xunchang J. Zhang,et al. A simulation of rill bed incision processes in upland concentrated flows[J]. CATENA,2018,165:310-319.
APA Chao Qin,Fenli Zheng,Xunchang J. Zhang,Ximeng Xu,Gang Liu,&Zheng, FL .(2018).A simulation of rill bed incision processes in upland concentrated flows.CATENA,165,310-319.
MLA Chao Qin,et al."A simulation of rill bed incision processes in upland concentrated flows".CATENA 165(2018):310-319.
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