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The influences of mass failure on the erosion and hydraulic processes of gully headcuts based on an in situ scouring experiment in Dry-hot valley of China
Dong, Yifan1,2; Xiong, Donghong1; Su, Zhengan1; Duan, Xingwu2; Lu, Xiaoning3; Zhang, Su1; Yuan, Yong1
Corresponding AuthorDong, Yifan(tommy@imde.ac.cn)
2019-05-01
Source PublicationCATENA
ISSN0341-8162
Volume176Pages:14-25
AbstractGully headcut retreat (GHR) is an important processes in gully development, and previous studies have tried to predict GHR rates based on flow hydraulic parameters during runoff scouring, but other dynamics such as gravity also affect GHR processes in addition to flow hydraulics. The aim of this study is to examine the influences of mass failures due to gravity on the erosion and hydraulics processes of gully headcuts during runoff scouring. A flow scouring experiment including 11 tests with two discharges (i.e., 7 tests with 83.31min(-1) and 4 tests with 166.71 min(-1)) was conducted on 5 in situ gully head plots with similar initial topographies. Totally 36 mass failure events were observed of all the 5 gully heads during the experiment, and 63.9% of the events were occurred during the first 10 min of the tests after drying-rewetting cycles. The tests were classified into two series according to whether the mass failure occurred during the scouring. The tests with mass failures (Series I) contributed 81.7% of the total soil loss of GHR, and the average GHR rates by mass (GHR(m)) was about 5 times higher than that of the tests without mass failures (Series II). The mass failure clearly influenced the flow resistances on gully beds by increasing the surfaces roughness and the sediment load to gully beds, and the average Darcy-Weisbach friction factor (f) and Manning coefficient (n) of Series I were clearly higher than those of Series II. Compared to the previous studies without significant soil collapse from gully heads, the logarithmic growth relationship between GHR(m) and the energy consumption (Delta E-t) was quite weak in this study, but the R-2 between GHR(m) and Delta E-t increased for longer time scales. The results indicated that for individual runoff events, GHR rates could not be predicted by flow hydraulics alone because mass failures due to gravity made great contribution, but on longer time scales, the influence of soil collapse is reduced, and flow hydraulics become the key factor impacting GHR processes.
KeywordGully headcut retreat Gully bed incision Mass failure Hydraulics Concentrated flow
DOI10.1016/j.catena.2019.01.004
Indexed BySCI
WOS KeywordRETREAT RATES ; SEDIMENT PRODUCTION ; AERIAL PHOTOGRAPHS ; CONCENTRATED FLOW ; BLACK SOIL ; MIGRATION ; REGION ; IMPACTS ; GROWTH ; AREAS
Language英语
Funding ProjectNational Key Research and Development Program of China[2017YFC0505102] ; National Natural Science Foundation of China[41671288] ; National Natural Science Foundation of China[41401103] ; Major Science and Technology Program for Water Pollution Control and Treatment[2017ZX07101001] ; China Scholarship Council
WOS Research AreaGeology ; Agriculture ; Water Resources
WOS SubjectGeosciences, Multidisciplinary ; Soil Science ; Water Resources
WOS IDWOS:000462107000002
Funding OrganizationNational Key Research and Development Program of China ; National Natural Science Foundation of China ; Major Science and Technology Program for Water Pollution Control and Treatment ; China Scholarship Council
PublisherELSEVIER SCIENCE BV
Citation statistics
Document Type期刊论文
Identifierhttp://ir.imde.ac.cn/handle/131551/24841
Collection山地灾害与地表过程重点实验室
Corresponding AuthorDong, Yifan
Affiliation1.Chinese Acad Sci, Key Lab Mt Hazards & Surface Proc, Inst Mt Hazards & Environm, Chengdu 610041, Sichuan, Peoples R China
2.Yunnan Univ, Yunnan Key Lab Int Rivers & Transboundary Ecosecu, Kunming 10095, Yunnan, Peoples R China
3.Chengdu Univ Informat Technol, Coll Resources & Environm, Chengdu 610225, Sichuan, Peoples R China
Recommended Citation
GB/T 7714
Dong, Yifan,Xiong, Donghong,Su, Zhengan,et al. The influences of mass failure on the erosion and hydraulic processes of gully headcuts based on an in situ scouring experiment in Dry-hot valley of China[J]. CATENA,2019,176:14-25.
APA Dong, Yifan.,Xiong, Donghong.,Su, Zhengan.,Duan, Xingwu.,Lu, Xiaoning.,...&Yuan, Yong.(2019).The influences of mass failure on the erosion and hydraulic processes of gully headcuts based on an in situ scouring experiment in Dry-hot valley of China.CATENA,176,14-25.
MLA Dong, Yifan,et al."The influences of mass failure on the erosion and hydraulic processes of gully headcuts based on an in situ scouring experiment in Dry-hot valley of China".CATENA 176(2019):14-25.
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