River Channel Forms in Relation to Bank Steepness: A Theoretical Investigation Using a Variational Analytical Method

doi:10.3390/w12051250

	River Channel Forms in Relation to Bank Steepness: A Theoretical Investigation Using a Variational Analytical Method
	Fan, Jinsheng 1,2; Huang, Heqing 1,2; Yu, Guoan 1; Su, Teng 1
刊名	WATER
	2020-05-01
卷号	12 期号:5 页码:18
关键词	alluvial rivers riverbank anti-scourability variational method equilibrium river channel forms
DOI	10.3390/w12051250
通讯作者	Huang, Heqing(huanghq@igsnrr.ac.cn)
英文摘要	Riverbanks vary considerably in anti-scourability and consequently take various profiles. By using an isosceles trapezoid as the generalized form of river channel cross-sections and then incorporating the effects of bank angle into the variational analytical approach developed by Huang and Nanson (2000), this study presents a detailed theoretical investigation of the self-adjustment of alluvial channel forms. It is demonstrated that when alluvial channel flow achieves stable equilibrium, a significant decrease in riverbank steepness leads to a slight decrease in maximum sediment (bedload) discharge, and yet results in a significant increase in optimal channel width and a considerable decrease in optimal channel depth. The hydraulic geometry relations, theoretically derived for bank steepness to vary across a wide range, show that among the multivariant controls, the roles of bed sediment size, channel roughness, flow discharge and sediment (bedload) discharge are independent of bank steepness. While the effects of bank steepness illustrated in the theoretically derived hydraulic geometry relations are highly consistent with the results of threshold theory and previous empirical studies, limitations on using bank angle to reflect the anti-scourability of natural riverbanks are also highlighted.
资助项目	National Key Research and Development Program of China[2016YFC0402502] ; National Natural Science Foundation of China[41561144012] ; National Natural Science Foundation of China[41661144030] ; National Natural Science Foundation of China[41971010]
WOS关键词	UNIT STREAM POWER ; GRAVEL-BED RIVERS ; MAXIMUM FLOW EFFICIENCY ; HYDRAULIC GEOMETRY ; EXTREMAL HYPOTHESES ; EQUILIBRIUM BANKS ; STRAIGHT RIVERS ; STABLE WIDTH ; MINIMUM RATE ; MOBILE BED
WOS研究方向	Water Resources
语种	英语
出版者	MDPI
WOS记录号	WOS:000555915200029
资助机构	National Key Research and Development Program of China ; National Natural Science Foundation of China
内容类型	期刊论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/158146]
专题	中国科学院地理科学与资源研究所
通讯作者	Huang, Heqing
作者单位	1.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Key Lab Water Cycle & Related Land Surface Proc, Beijing 100101, Peoples R China 2.Univ Chinese Acad Sci, Coll Resources & Enviroment, Beijing 100049, Peoples R China
推荐引用方式 GB/T 7714	Fan, Jinsheng,Huang, Heqing,Yu, Guoan,et al. River Channel Forms in Relation to Bank Steepness: A Theoretical Investigation Using a Variational Analytical Method[J]. WATER,2020,12(5):18.
APA	Fan, Jinsheng,Huang, Heqing,Yu, Guoan,&Su, Teng.(2020).River Channel Forms in Relation to Bank Steepness: A Theoretical Investigation Using a Variational Analytical Method.WATER,12(5),18.
MLA	Fan, Jinsheng,et al."River Channel Forms in Relation to Bank Steepness: A Theoretical Investigation Using a Variational Analytical Method".WATER 12.5(2020):18.