Hydraulic properties of concentrated flow of a bank gully in the dry-hot valley region of southwest China

CORC > 成都山地灾害与环境研究所 > 中国科学院水利部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

	Hydraulic properties of concentrated flow of a bank gully in the dry-hot valley region of southwest China
	Su, Zhengan(苏正安)1; Xiong, Donghong（熊东红）1; Dong, Yifan（董一帆）1; Zhang, Baojun1 ; Zhang, Su1,2 ; Zheng, Xueyong1 ; Yang, Dan1 ; Zhang, Jianhui1 ; Fan, Jianrong1 ; Fang, Haidong 3
刊名	EARTH SURFACE PROCESSES AND LANDFORMS
	2015-08-01
卷号	40 期号:10 页码:1351-1363
关键词	bank gully hydraulic properties temporal variation energy consumption of flow dry-hot valley
ISSN号	0197-9337
通讯作者	Xiong, Donghong
英文摘要	To quantify spatiotemporal variation in hydraulic properties of bank gully concentrated flow, a series of scour experiments were run under water discharge rates ranging from 30 to 120 l min(-1). Concentrated flows were found to be turbulent and supercritical in the upstream catchment area and downstream gully beds. As discharge increased, values of the soil erosion rate, Reynolds number (Re), shear stress, stream power, and flow energy consumption (E) increased while values of the Froude number (Fr) and the Darcy-Weisbach friction factor (resistance f) did not. With the exception of gully headcut collapse under discharge rates of 60, 90, and 120 l min(-1), a declining power function trend (P < 0.05) in the soil erosion rate developed in the upstream catchment area, headcuts, and downstream gully beds. However, increasing trends were observed in temporal variations of hydraulic properties for downstream gully beds and the upstream catchment area. Despite significant differences in temporal variation between the soil erosion rate and hydraulic property values, relative steady state conditions of the soil erosion rate and E were attained following an initial period of adjustment in the upstream catchment area, headcuts, and downstream gully beds under different discharge rates. A logarithmic growth of flow energy consumption per unit soil loss (E-u) was observed in bank gullies and the upstream catchment area as the experiment progressed, further illustrating the actual reason behind the discrepancy in temporal variation between soil erosion rates and E. Results demonstrate that E can be used to estimate headcut erosion soil loss, but further quantitative studies are required to quantify coupling effects between hydraulic properties and vertical variation in soil mechanical properties on temporal variation for bank gully soil erosion rates. Copyright (c) 2015 John Wiley & Sons, Ltd.
WOS标题词	Science & Technology ; Physical Sciences
类目[WOS]	Geography, Physical ; Geosciences, Multidisciplinary
研究领域[WOS]	Physical Geography ; Geology
关键词[WOS]	MEDITERRANEAN ENVIRONMENTS ; HEADCUT DEVELOPMENT ; FLUVIAL MEGAFAN ; SOIL-EROSION ; CHANNEL ; MORPHODYNAMICS ; DETACHMENT ; HEIGHT
收录类别	SCI
语种	英语
WOS记录号	WOS:000359258900006
内容类型	期刊论文
源URL	[http://ir.imde.ac.cn/handle/131551/10853]
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成都山地灾害与环境研究所_山地表生过程与生态调控重点实验室成都山地灾害与环境研究所_数字山地与遥感应用中心
作者单位	1.Chinese Acad Sci, Inst Mt Hazards & Environm, Key Lab Mt Hazards & Earth Surface Proc, Chengdu 610041, Peoples R China 2.Sichuan Agr Univ, Coll Agron, Chengdu, Peoples R China 3.Yunnan Acad Agr Sci, Inst Trop Ecoagr Sci, Yuanmou, Peoples R China
推荐引用方式 GB/T 7714	Su, Zhengan,Xiong, Donghong,Dong, Yifan,et al. Hydraulic properties of concentrated flow of a bank gully in the dry-hot valley region of southwest China[J]. EARTH SURFACE PROCESSES AND LANDFORMS,2015,40(10):1351-1363.
APA	Su, Zhengan.,Xiong, Donghong.,Dong, Yifan.,Zhang, Baojun.,Zhang, Su.,...&Su, Zhengan.(2015).Hydraulic properties of concentrated flow of a bank gully in the dry-hot valley region of southwest China.EARTH SURFACE PROCESSES AND LANDFORMS,40(10),1351-1363.
MLA	Su, Zhengan,et al."Hydraulic properties of concentrated flow of a bank gully in the dry-hot valley region of southwest China".EARTH SURFACE PROCESSES AND LANDFORMS 40.10(2015):1351-1363.