Predicting the Morphodynamic Response of Silt-Laden Rivers to Water and Sediment Release from Reservoirs: Lower Yellow River, China

The 2-D water and sediment mathematical model which reflects silting in floodplain and scouting in main channel of over-bank flooding in the Lower Yellow River has been set up in this paper. Through carrying on 2-D water and sediment numerical simulation of the “96.8” typical flood, the author studied influence of over-bank flooding on flood travel and transverse exchange. The primary simulation results show that, adopting the over-bank flooding for silting in floodplain and scouting in main channel effectively guaranteed and expanded transverse exchange between floodplain and main channel and maintained the river channel vigor. This can relieve “secondary suspended river” states in the Low Yellow River to a certain extent; at the same time, the different magnitudes of over-bank floods have different effect of silting in floodplain and scouting in main channel.

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Research on the Numerical Simulation of Zoning Flood Retarding and Sand Silting of Flood Plain in the Lower Yellow River

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.243-249.4576 ◽

2011 ◽

Vol 243-249 ◽

pp. 4576-4580

Author(s):

Xiao Lei Zhang ◽

Dong Po Sun ◽

Jun Jie Li

Keyword(s):

Numerical Simulation ◽

Mathematical Model ◽

Flow Structure ◽

Yellow River ◽

Flood Plain ◽

Lower Yellow River ◽

The Lower Yellow River ◽

Water And Sediment ◽

Set Up

The 2-D water and sediment mathematical model which reflects flood retarding and sand silting of flood plain in the Lower Yellow River has been set up in this paper. Through carrying on 2-D water and sediment numerical simulation of the “96.8” typical flood, the authors studied influence of zoning flood retarding and sand silting on flood travel, flow structure of floodplain-channel and transver exchange of water and sediment. The simulating results in different conditions show that, adopting the zoning flood retarding and sand silting in the Lower Yellow River effectively worked on retarding flood and sharpening peaks in the flood retarding basin, guaranteed and expanded transver exchange of water and sediment in the floodplain and channel and maintained the river channel’s vigor. This can relieve “secondary suspended river” states in the Low Yellow River to a certain extent.

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

Water ◽

10.3390/w11020357 ◽

2019 ◽

Vol 11 (2) ◽

pp. 357 ◽

Cited By ~ 1

Author(s):

Xiaofei Liu ◽

Changxing Shi ◽

Yuanyuan Zhou ◽

Zhenkui Gu ◽

Huijuan Li

Keyword(s):

Yellow River ◽

Water Discharge ◽

Sediment Concentration ◽

Main Channel ◽

River Channel ◽

Lower Yellow River ◽

Main Research ◽

The Lower Yellow River ◽

Water And Sediment ◽

Geomorphic Units

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.

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Effect of water and sediment regulation on lower Yellow River

Transactions of Tianjin University ◽

10.1007/s12209-009-0020-7 ◽

2009 ◽

Vol 15 (2) ◽

pp. 113-120 ◽

Cited By ~ 9

Author(s):

Guobin Xu ◽

Chundi Si

Keyword(s):

Yellow River ◽

Lower Yellow River ◽

Effect Of Water ◽

Water And Sediment ◽

Water And Sediment Regulation

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Characteristics Identification of Runoff and Sediment Flux Based on Wavelet Analysis Approach in Lower Yellow River

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.700.506 ◽

2014 ◽

Vol 700 ◽

pp. 506-510

Author(s):

Yu Zhi Shi ◽

Ming Yuan Fan ◽

Yu Yan Zhang ◽

Hai Jiao Liu ◽

Xiao Feng Yang

Keyword(s):

Climate Change ◽

Time Series ◽

Wavelet Analysis ◽

Yellow River ◽

Sediment Flux ◽

The Yellow River ◽

Lower Yellow River ◽

Multi Scale ◽

Flood Season ◽

Water And Sediment

Due to the influences of climate change and human activities, the water and sediment flux of the Yellow River are certainly changing. This paper selects monthly time series of runoff and sediment flux from 1950 to 2009 for study at Lijin station, in lower Yellow River. A widely used identification method, wavelet analysis, is applied for recognizing changing point and cycle of the runoff and sediment respectively in multi-scale of annual, flood season and non-flood season. The results indicate that there are two significant changing points in 1985, 2002 year, and cycle recognized results are different in multi-scale as well as with different hydrology factors.

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The variation and attribution analysis of the runoff and sediment in the lower reach of the Yellow River during the past 60 years

Water Science & Technology Water Supply ◽

10.2166/ws.2021.085 ◽

2021 ◽

Author(s):

Hongxiang Wang ◽

Jinghang Liu ◽

Wenxian Guo

Keyword(s):

Human Activities ◽

Sediment Load ◽

Yellow River ◽

Annual Runoff ◽

Ratio Method ◽

The Yellow River ◽

Lower Reach ◽

Lower Yellow River ◽

The Lower Yellow River ◽

Water And Sediment

Abstract The water and sediment regimes of the Yellow River are the basis of decision-making of major projects of the Yellow River. Based on the water and sediment data at the Huayuankou station, Gaocun station, Aishan station, Lijin station in the lower reach of the Yellow River, the Mann-Kendall test, the T-test for differences, wavelet analysis, slope change ratio method and the double cumulative curve method were applied to analyze the runoff and sediment regimes alteration. The results show that the water and sediment of the lower Yellow River have a significant downward trend, and the annual sediment decreases significantly compared with the annual runoff. The annual runoff and sediment of the four hydrological stations changed around the 1980 and 1990s, respectively. The water and sediment of hydrological stations have periodic variations on multiple time scales, but the variation scales are different. Precipitation, human activities and other factors lead to the decrease trend of water and sediment in the lower Yellow River, and their contribution rates to the change of water and sediment are also different. Precipitation contributed 0.15%–8.71% and 0.06%–22.32% to the reduction of runoff and sediment load at hydrological stations, while human activities contributed 91.29%–99.85% and 77.68%–102.21% to the reduction of runoff and sediment load, respectively. Human activity is the main factor of runoff and sediment reduction.

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