The impact of flow discharge on the hydraulic characteristics of headcut erosion processes in the gully region of the Loess Plateau

doi:10.1002/hyp.13620

	The impact of flow discharge on the hydraulic characteristics of headcut erosion processes in the gully region of the Loess Plateau
	Shi, Qianhua 2; Wang, Wenlong 1,2; Guo, Mingming 2; Chen, Zhuoxin 2; Feng, Lanqian 1; Zhao, Man 2; Xiao, Hai 3
刊名	HYDROLOGICAL PROCESSES
	2019-12-05
页码	12
关键词	flow energy gully region of Loess Plateau headcut erosion hydraulic properties sediment discharge
ISSN号	0885-6087
DOI	10.1002/hyp.13620
通讯作者	Wang, Wenlong(wlwang@nwafu.edu.cn)
英文摘要	Headcut erosion is associated with major hydraulic changes induced by the gully head of concentrated flow. However, the variation in the hydraulic characteristics of the headcut erosion process is still not clear in the gully region of the Loess Plateau. A series of rainfall combined scouring experiments (flow discharges ranging from 3.6 to 7.2 m(3) hr(-1), with 0.8 mm min(-1) rainfall intensity) were conducted on experimental plots to clarify the variation in the hydraulic parameters induced by gully head and erosion processes under different flow discharges. The results showed that concentrated flows in the catchment area and gully bed were turbulent (Reynolds number ranging from 1,876 to 6,693) and transformed between supercritical and subcritical (Froude number ranging from 0.96 to 3.73). The hydraulic parameters, such as the flow velocity, Reynolds number, shear stress, stream power, Darcy-Weisbach friction factor, and unit stream power in the catchment area were 0.45-0.59 m s(-1), 2086-6693, 1.96-5.33 Pa, 0.89-2.86 W m(-2), 0.08-0.16, and 0.023-0.031 m s(-1), respectively. When the concentrated flows dropped from the gully head, the hydraulic parameters in the gully bed decreased by 3.39-26.07%, 1.49-29.99%, 65.19-67.14%, 67.25-74.96%, 28.53-61.31%, and 67.82-77.14%, respectively, which contributed to the flow energy consumption at the gully head. As flow discharge increased, Reynolds number, shear stress, and stream power increased, while flow velocity, Froude number, unit stream power, and Darcy-Weisbach friction factor did not. The flow energy consumption at the gully head was 9.66-10.13, 13.25-13.74, 15.68-16.41, and 19.28-20.25 J s(-1), respectively, under different flow discharges and accounted for 60.58-68.50% of the flow energy consumption of the experimental plots. Generally, the sediment discharges increased rapidly at the initial stage, then increased slowly, and finally reached a steady state condition, which showed a significant declining logarithmic trend with experimental duration (P<.01) and increased with increasing flow discharge. Accordingly, the flow energy consumption was significantly correlated with the sediment yield. These findings could improve our understanding of the hydraulic properties and flow energy characteristics of headcut erosion.
资助项目	Major Program of the National Natural Science Foundation of China[41790444/D0214] ; National Basic Research Program of China ; Western Action Plan Project of the Chinese Academy of Sciences[KZCX-XB3-13]
WOS关键词	HOT VALLEY REGION ; SEDIMENT TRANSPORT CAPACITY ; INITIAL STEP HEIGHT ; BANK GULLIES ; ERODIBILITY ; MIGRATION ; PRESSURE ; CROPLAND ; GROWTH ; RUNOFF
WOS研究方向	Water Resources
语种	英语
出版者	WILEY
WOS记录号	WOS:000500685400001
资助机构	Major Program of the National Natural Science Foundation of China ; National Basic Research Program of China ; Western Action Plan Project of the Chinese Academy of Sciences
内容类型	期刊论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/130544]
专题	中国科学院地理科学与资源研究所
通讯作者	Wang, Wenlong
作者单位	1.Chinese Acad Sci & Minist Water Resources, Inst Soil & Water Conservat, Yangling, Shaanxi, Peoples R China 2.Northwest A&F Univ, Inst Soil & Water Conservat, State Key Lab Soil Eros & Dryland Farming Loess P, 26 Xinong Rd, Yangling 712100, Shaanxi, Peoples R China 3.China Three Gorges Univ, Minist Educ, Engn Res Ctr Ecoenvironm Three Gorges Reservoir R, Yichang, Peoples R China
推荐引用方式 GB/T 7714	Shi, Qianhua,Wang, Wenlong,Guo, Mingming,et al. The impact of flow discharge on the hydraulic characteristics of headcut erosion processes in the gully region of the Loess Plateau[J]. HYDROLOGICAL PROCESSES,2019:12.
APA	Shi, Qianhua.,Wang, Wenlong.,Guo, Mingming.,Chen, Zhuoxin.,Feng, Lanqian.,...&Xiao, Hai.(2019).The impact of flow discharge on the hydraulic characteristics of headcut erosion processes in the gully region of the Loess Plateau.HYDROLOGICAL PROCESSES,12.
MLA	Shi, Qianhua,et al."The impact of flow discharge on the hydraulic characteristics of headcut erosion processes in the gully region of the Loess Plateau".HYDROLOGICAL PROCESSES (2019):12.