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	The influence of dilution on downstream channel sedimentation in large rivers: the Yellow River, China
	Xu J. X.
	2014
关键词	sediment transport sedimentation decoupling of water and sediment sources dilution effect the Yellow River budget
英文摘要	Due to the temporal decoupling of water and sediment sources in a large river basin, a flood from a sediment source area with high suspended sediment concentration (SSC) may be diluted by flow from a major runoff source area with low SSC. In this paper, this dilution effect is considered for 145 flood events from the Yellow River, China. Two indices (beta(1) and beta(2)) describing the dilution effect are proposed, based on water and sediment from the clear water source area and the coarse sediment producing area. Regression equations between channel sedimentation (S-dep) and beta(1) and beta(2) are established based on flood events and annual data, respectively. The results show that dilution reduces channel sedimentation in the lower reaches by 34 center dot 1% and that this is related to a reduced frequency of hyperconcentrated flows in the lower reaches. The Longyangxia Reservoir for hydro-electric generation has stored huge quantities of clear runoff from the upper Yellow River during high-flow season since 1985, greatly reducing the dilution of the hyperconcentrated floods and therefore enhancing sedimentation in the lower reaches. For the purpose of reducing sedimentation, changing the operational mode of the Longyangxia Reservoir to restore the dilution effect is suggested. Copyright (c) 2013 John Wiley & Sons, Ltd.
出处	Earth Surface Processes and Landforms
卷	39
期	4
页	450-462
收录类别	SCI
语种	英语
ISSN号	0197-9337
内容类型	SCI/SSCI论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/29488]
专题	地理科学与资源研究所_历年回溯文献
推荐引用方式 GB/T 7714	Xu J. X.. The influence of dilution on downstream channel sedimentation in large rivers: the Yellow River, China. 2014.

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