Response of Erosion and Deposition of Channel Bed, Banks and Floodplains to Water and Sediment Changes in the Lower Yellow River, China

doi:10.3390/w11020357

	Response of Erosion and Deposition of Channel Bed, Banks and Floodplains to Water and Sediment Changes in the Lower Yellow River, China
	Liu, Xiaofei 1,2; Shi, Changxing 1; Zhou, Yuanyuan 1; Gu, Zhenkui 1,2; Li, Huijuan 1,2
刊名	WATER
	2019-02-01
卷号	11 期号:2 页码:15
关键词	lower Yellow River geomorphic unit channel erosion and siltation river channel pattern
ISSN号	2073-4441
DOI	10.3390/w11020357
通讯作者	Shi, Changxing(shicx@igsnrr.ac.cn)
英文摘要	River channel change can be very sensitive to environmental change and human activities and it has been one of the main research topics in fluvial geomorphology. In this study, repeated channel geometric measurements were used to investigate the channel adjustment to water and sediment changes of the lower Yellow River in China in the past few decades. With a high sediment concentration and large variations of water discharge, the lower Yellow River has a much active channel in its form and location, which has hindered previous research efforts to study long-term differentiated erosion/deposition of different geomorphic units in the channel. In this study, we divided each of four typical channel across-sections at hydrological stations in the lower Yellow River into different units according to the geomorphological features, and give a detailed investigation of erosion/deposition processes of these geomorphic units and the interactions between them besides the influence of incoming water and sediment conditions. The results show that with a significant decreasing trend of both the annual runoff and sediment load of the river and abrupt changes in 1985-1996, the overall siltation trend in the river channel before 1990 had been replaced by a slight erosion trend after 2006. In the earlier period, the siltation in the upstream wandering and transitional reaches mainly occurred on floodplains and that in the downstream straight reaches principally on main channel bed. In the later period, erosion occurred mainly on high and low bank slopes in the wandering reaches and on main channel bed in the transitional reaches. The erosion became weak in the wandering reaches after 2010, continued in the transitional reaches, and was still relatively minor in the straight reaches, reflecting the downstream hysteresis channel response to changes in water and sediment discharges down dams. Our results suggest that the seasonal erosion/deposition of a geomorphic unit of the river channel can be attributed to the changes in water and sediment discharges as well as to the interaction between geomorphic units. Siltation on the main channel bed could be attributed to erosion on the bank slopes in both the sections in the wandering and transitional reaches, and erosion of the main channel bed in flood seasons was negatively related with the mean water discharge at the two sections in the straight reaches. This result implies that fixing the bank slopes in the wandering and transitional reaches and raising the water discharge in the straight reach in flood seasons are favorable options for controlling the development of the two-level perching channel of the lower Yellow River.
资助项目	National Key Research and Development Program of China[2016YFC0402502] ; National Key Research and Development Program of China[2017YFC0405506] ; National Natural Science Foundation of China[41501009]
WOS关键词	CLIMATE-CHANGE ; IMPACT ; YANGTZE ; REGIME ; FLUX ; DAM ; PATTERNS ; RUNOFF ; BASIN
WOS研究方向	Water Resources
语种	英语
出版者	MDPI
WOS记录号	WOS:000460899600176
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/311030/48673]
专题	中国科学院地理科学与资源研究所
通讯作者	Shi, Changxing
作者单位	1.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Key Lab Water Cycle & Related Land Surface Proc, 11A Datun Rd, Beijing 100101, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
推荐引用方式 GB/T 7714	Liu, Xiaofei,Shi, Changxing,Zhou, Yuanyuan,et al. Response of Erosion and Deposition of Channel Bed, Banks and Floodplains to Water and Sediment Changes in the Lower Yellow River, China[J]. WATER,2019,11(2):15.
APA	Liu, Xiaofei,Shi, Changxing,Zhou, Yuanyuan,Gu, Zhenkui,&Li, Huijuan.(2019).Response of Erosion and Deposition of Channel Bed, Banks and Floodplains to Water and Sediment Changes in the Lower Yellow River, China.WATER,11(2),15.
MLA	Liu, Xiaofei,et al."Response of Erosion and Deposition of Channel Bed, Banks and Floodplains to Water and Sediment Changes in the Lower Yellow River, China".WATER 11.2(2019):15.