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
文献类型：期刊论文
| 作者 | Dong, Yifan1,2 ; Xiong, Donghong1; Su, Zhengan1; Duan, Xingwu2; Lu, Xiaoning3; Zhang, Su1; Yuan, Yong1
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| 刊名 | CATENA
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| 出版日期 | 2019-05-01 |
| 卷号 | 176页码:14-25 |
| 关键词 | Gully headcut retreat Gully bed incision Mass failure Hydraulics Concentrated flow |
| ISSN号 | 0341-8162 |
| DOI | 10.1016/j.catena.2019.01.004 |
| 通讯作者 | Dong, Yifan(tommy@imde.ac.cn) |
| 英文摘要 | Gully 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. |
| WOS关键词 | RETREAT RATES ; SEDIMENT PRODUCTION ; AERIAL PHOTOGRAPHS ; CONCENTRATED FLOW ; BLACK SOIL ; MIGRATION ; REGION ; IMPACTS ; GROWTH ; AREAS |
| 资助项目 | National 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研究方向 | Geology ; Agriculture ; Water Resources |
| 语种 | 英语 |
| WOS记录号 | WOS:000462107000002 |
| 出版者 | ELSEVIER SCIENCE BV |
| 资助机构 | National 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 |
| 源URL | [http://ir.imde.ac.cn/handle/131551/24841]  |
| 专题 | 成都山地灾害与环境研究所_山地灾害与地表过程重点实验室 |
| 通讯作者 | Dong, Yifan |
| 作者单位 | 1.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 |
| 推荐引用方式 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. |
入库方式： OAI收割
来源：成都山地灾害与环境研究所
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