Spatiotemporal changes in flow hydraulic characteristics and soil loss during gully headcut erosion under controlled conditions

doi:10.5194/hess-25-4473-2021

	Spatiotemporal changes in flow hydraulic characteristics and soil loss during gully headcut erosion under controlled conditions
	Guo, Mingming 2; Chen, Zhuoxin 3; Wang, Wenlong 1,3; Wang, Tianchao 4; Shi, Qianhua 3; Kang, Hongliang 3; Zhao, Man 3; Feng, Lanqian 1
刊名	HYDROLOGY AND EARTH SYSTEM SCIENCES
	2021-08-19
卷号	25 期号:8 页码:4473-4494
ISSN号	1027-5606
DOI	10.5194/hess-25-4473-2021
通讯作者	Guo, Mingming(guomingming@iga.ac.cn) ; Wang, Wenlong(nwafu_wwl@163.com)
英文摘要	The spatiotemporal changes in flow hydraulics and energy consumption and their associated soil erosion remain unclear during gully headcut retreat. A simulated scouring experiment was conducted on five headcut plots consisting of upstream area (UA), gully headwall (GH), and gully bed (GB) to elucidate the spatiotemporal changes in flow hydraulic, energy consumption, and soil loss during headcut erosion. The flow velocity at the brink of a headcut increased as a power function of time, whereas the jet velocity entry to the plunge pool and jet shear stress either logarithmically or linearly decreased over time. The jet properties were significantly affected by upstream flow discharge. The Reynolds number, runoff shear stress, and stream power of UA and GB increased as logarithmic or power functions of time, but the Froude number decreased logarithmically over time. The Reynolds number, shear stress, and stream power decreased by 56.0 %, 63.8 %, and 55.9 %, respectively, but the Froude number increased by 7.9 % when flow dropped from UA to GB. The accumulated energy consumption of UA, GH, and GB positions linearly increased with time. In total, 91.12 %-99.90 % of total flow energy was consumed during headcut erosion, of which the gully head accounted for 77.7 % of total energy dissipation, followed by UA (18.3 %), and GB (4.0 %). The soil loss rate of the "UA-GH-GB" system initially rose and then gradually declined and levelled off. The soil loss of UA and GH decreased logarithmically over time, whereas the GB was mainly characterized by sediment deposition. The proportion of soil loss at UA and GH is 11.5 % and 88.5 %, respectively, of which the proportion of deposited sediment on GB reached 3.8 %. The change in soil loss of UA, GH, and GB was significantly affected by flow hydraulic and jet properties. The critical energy consumption initiating soil erosion of UA, GH, and GB is 1.62, 5.79, and 1.64Js(-1), respectively. These results are helpful for deepening the understanding of gully erosion process and hydrodynamic mechanisms and can also provide a scientific basis for the construction of gully erosion model and the design of gully erosion prevention measures.
资助项目	National Natural Science Foundation of China[42077079] ; National Natural Science Foundation of China[41571275] ; China Postdoctoral Science Foundation[2020M681062] ; China Postdoctoral Science Foundation[2021T140663] ; National Key Research and Development Program of China[2016YFC0501604]
WOS关键词	HOT VALLEY REGION ; SEDIMENT TRANSPORT CAPACITY ; INITIAL STEP HEIGHT ; UNIT STREAM POWER ; LAND-USE CHANGES ; LOESS PLATEAU ; AERIAL PHOTOGRAPHS ; BANK GULLIES ; RILL FLOW ; RETREAT
WOS研究方向	Geology ; Water Resources
语种	英语
出版者	COPERNICUS GESELLSCHAFT MBH
WOS记录号	WOS:000687138800002
资助机构	National Natural Science Foundation of China ; China Postdoctoral Science Foundation ; National Key Research and Development Program of China
内容类型	期刊论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/164603]
专题	中国科学院地理科学与资源研究所
通讯作者	Guo, Mingming; Wang, Wenlong
作者单位	1.Chinese Acad Sci & Minist Water Resources, Inst Soil & Water Conservat, Yangling 712100, Shaanxi, Peoples R China 2.Chinese Acad Sci, Northeast Inst Geog & Agroecol, Key Lab Mollisols Agroecol, Harbin 150081, Heilongjiang, Peoples R China 3.Northwest A&F Univ, Inst Water & Soil Conservat, State Key Lab Soil Eros & Dryland Farming Loess P, Yangling 712100, Shaanxi, Peoples R China 4.Ulanqab Grassland Stn, Ulanqab 012000, Inner Mongolia, Peoples R China
推荐引用方式 GB/T 7714	Guo, Mingming,Chen, Zhuoxin,Wang, Wenlong,et al. Spatiotemporal changes in flow hydraulic characteristics and soil loss during gully headcut erosion under controlled conditions[J]. HYDROLOGY AND EARTH SYSTEM SCIENCES,2021,25(8):4473-4494.
APA	Guo, Mingming.,Chen, Zhuoxin.,Wang, Wenlong.,Wang, Tianchao.,Shi, Qianhua.,...&Feng, Lanqian.(2021).Spatiotemporal changes in flow hydraulic characteristics and soil loss during gully headcut erosion under controlled conditions.HYDROLOGY AND EARTH SYSTEM SCIENCES,25(8),4473-4494.
MLA	Guo, Mingming,et al."Spatiotemporal changes in flow hydraulic characteristics and soil loss during gully headcut erosion under controlled conditions".HYDROLOGY AND EARTH SYSTEM SCIENCES 25.8(2021):4473-4494.