scholarly journals Prediction research on sedimentation balance of Three Gorges Reservoir under new conditions of water and sediment

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Peng Chen ◽  
Jinyun Deng ◽  
Guangming Tan ◽  
Jinyou Lu ◽  
Zhongwu Jin ◽  
...  
Keyword(s):  
Three Gorges Reservoir ◽  
Sediment Concentration ◽  
Three Gorges ◽  
Jinsha River ◽  
Erosion And Deposition ◽  
The Three Gorges ◽  
Water And Sediment ◽  
Sediment Data ◽  
Measured Water

AbstractInfluenced by climate change and human activities, especially the completion and operation of cascade reservoirs in the middle and lower reaches of Jinsha River since 2012, new changes have taken place in the water and sediment characteristics of the Three Gorges Reservoir (TGR) in recent years. In this paper, a one-dimensional unsteady water and sediment mathematical model of the main and tributary rivers of the TGR is established, and the main calculation parameters of the model are calibrated with the measured water and sediment data from January 1, 2008 to December 31, 2017. In view of the different combinations of inflow water and sediment that may occur in the TGR under the condition of new water and sediment, the long-term changes of sediment erosion and deposition and the balance of reservoir deposition in the TGR are studied using the model. The results show that: (1) Under the new conditions of water and sediment, the amount of sediment in the TGR accounts for only 14.8% and 35.8% of that in 1956–1990 and 2003–2012, respectively; (2) The variation process of water level, discharge and sediment concentration of each station along the route calculated by the model is basically consistent with the measured results, and the calculated values of total deposition amount and deposition distribution are also basically consistent with the measured results. The verification results of the model are in accordance with the measured values; (3) Under the water-sediment conditions during 1961–1970 and 1991–2000, the model predicted the estimates of 320 and 430 years for the TGR to reach a sedimentation balance, respectively. Under the new water-sediment conditions, it takes 560 years at most and 450 years at least to reach the sedimentation balance for the TGR, and the corresponding condition is the typical year with less water-less sediment and more water-more sediment, respectively. The research results of this paper can provide a new reference for the long-term safe operation and operation optimization of the TGR.

Study on Sandy Pebble Reach Riverbed Erosion and Deposition Basic Law after the Three Gorges Reservoir

2014 ◽  
Vol 580-583 ◽  
pp. 1888-1892
Author(s):  
Xiao Fei Liu ◽  
Mei Li Zhang ◽  
Zhi Wei Ye
Keyword(s):  
Yangtze River ◽  
Three Gorges Reservoir ◽  
Large Scale ◽  
Paper Study ◽  
Three Gorges ◽  
Erosion And Deposition ◽  
The Three Gorges Reservoir ◽  
The Three Gorges ◽  
Water And Sediment ◽  
Basic Law

After the Three Gorges Reservoir, sandy pebble Reach incoming water and sediment conditions has change, the changes of incoming water and sediment conditions might make sandy pebble reach riverbed scouring-erosion variation. This paper study on sandy pebble reach riverbed erosion and deposition basic law after the Three Gorges Reservoir, and provide the decision basis for large-scale system renovation in the middle Yangtze River.

scholarly journals Variation and Driving Factors of Water Discharge and Sediment Load in Different Regions of the Jinsha River Basin in China in the Past 50 Years

Water ◽  
2019 ◽  
Vol 11 (5) ◽  
pp. 1109 ◽  
Author(s):  
Shang-Wu Liu ◽  
Xiao-Feng Zhang ◽  
Quan-Xi Xu ◽  
De-Chun Liu ◽  
Jing Yuan ◽  
...  
Keyword(s):  
River Basin ◽  
Three Gorges Reservoir ◽  
Sediment Load ◽  
Water Discharge ◽  
Driving Factors ◽  
Three Gorges ◽  
Jinsha River ◽  
The Past ◽  
The Three Gorges ◽  
Water And Sediment

The Jinsha River is the main source of sediment in the Yangtze River Basin. The variation of water discharge and sediment load not only affects the operation of the cascade reservoirs in the basin but also change the water and sediment conditions into the Three Gorges Reservoir. The Jinsha River Basin is divided into six regions based on the measured data of hydrological stations. Herein, the variation regularity and driving factors of water discharge and sediment load in the Jinsha River Basin are analyzed in the past 50 years using the Mann–Kendall and Rank Sum Test. Results show that the source of water and sediment in the Jinsha River Basin is different, and the abrupt and trend changes of water discharge and sediment load in different regions are evident different. Changes in precipitation, water and soil conservation projects, and the construction of reservoirs are the main driving factors of sediment load variation. The average annual sediment reduction load in the Jinsha River from 1998 to 2015 is approximately 99.57 × 106 t/y, of which the contributions of water discharge change and human activities to sediment load are 18.9% and 81.1%, respectively. The reduction of sediment load in the Jinsha River Basin can result in evident decrease in the sedimentation of cascade reservoirs, erosion of the downstream channel of the river, and considerable reduction of sediment load into the Three Gorges Reservoir.

Research on Characteristics of New Water and Sediment of Yichang Station after Impoundment of the Three Gorges

2013 ◽  
Vol 779-780 ◽  
pp. 1613-1618 ◽  
Author(s):  
Yan Hua Yang ◽  
Xiao Qiang Liu ◽  
Hong Qian Zhang
Keyword(s):  
Yangtze River ◽  
Three Gorges Reservoir ◽  
Test Method ◽  
Rank Test ◽  
Sediment Runoff ◽  
Three Gorges ◽  
The Yangtze River ◽  
The Three Gorges Reservoir ◽  
The Three Gorges ◽  
Water And Sediment

Reservoir regulation and reservoir sedimentation make conditions of flow and sediment under the dam change greatly after impoundment of the Three Gorges Project. This paper analyzes change trend and abrupt change situation of incoming water and sediment and studies characteristics of new flow and sediment of Yichang Station after impoundment of the Three Gorges with Mann-Kendall nonparametric rank test method. The result indicates that operation of the Three Gorges Reservoir has leveled runoff process and shortened dry season and extended median water period. After operation of the Three Gorges Reservoir, annual sediment runoff and monthly sediment runoff of some months changed suddenly and sediment runoff reduced sharply in Yichang Station. Sediment entering the middle and the lower reaches of the Yangtze River decreases substantially and it almost can be regarded as clean water discharge. Intorduction After operation of 175m normal water level of the Three Gorges Reservoir, total storage capacity of the reservoir is about 43 billion m3. Most of incoming sediment in the upstream is intercepted and deposited inside the reservoir and clean water and muddy water containing non-bed sand discharges. Change of water and sediment conditions destroys balance of downstream river and causes bed-rebuilding of downstream channels. And this results in a serious of long-term and long distance changes, such as on-way recovery of sand content, undercutting of bed scour, expansion of bank erosion and decline of water table, etc.[1-. Yichang Station controls a drainage area of 1005501km2 in upstream of the Yangtze River and is a major flood source for the middle and the lower reach of the Yangtze River. Thus, water regime information of Yichang Station is significant to flood control of the middle and the lower reach of the Yangtze River, regulation of the Three Gorges Reservoir, construction of water conservancy project all across the Yangtze River, industrial and agricultural production and shipping, etc. On account of this, this article analyzes data about coming water and sediment of Yichang Station to support characteristics of new flow and sediment of Yichang Station after impoundment of the Three Gorges with Mann-Kendall nonparametric rank test method.

Long-term monitoring revealed fish assemblage zonation in the Three Gorges Reservoir

2018 ◽  
Vol 37 (4) ◽  
pp. 1258-1267 ◽  
Author(s):  
Pengcheng Lin ◽  
Xin Gao ◽  
Fei Liu ◽  
Mingzheng Li ◽  
Huanzhang Liu
Keyword(s):  
Fish Assemblage ◽  
Three Gorges Reservoir ◽  
Three Gorges ◽  
The Three Gorges Reservoir ◽  
The Three Gorges ◽  
Long Term Monitoring ◽  
Term Monitoring

Influence of the Three Gorges Reservoir Filling at 175m Scheme on Chongqing Water Transportation

2012 ◽  
Vol 209-211 ◽  
pp. 786-791
Author(s):  
Jing Li Yang ◽  
Hua Fu ◽  
Yao Chang Ma ◽  
Yun Yun Yang
Keyword(s):  
Three Gorges Reservoir ◽  
Three Gorges ◽  
The Three Gorges Reservoir ◽  
Chongqing Municipality ◽  
Water Transportation ◽  
The Three Gorges ◽  
Reservoir Impoundment ◽  
Jialing River ◽  
Reservoir Filling

Jialing River flows into Yangtze River at main city zone of Chongqing Municipality, evolutional mechanism of rivers near the confluence site obviously shows some estuary properties. In September 2008, the Three Gorges Reservoir experimented to fill water at 175m, thus, rivers near the Chongqing Municipality are located in the upper or middle area of fluctuating backwater region and alternatively behave as reservoirs or natural rivers. On the basis of field experimental data of the reservoir impoundment process, the properties of sediment transport of some key harbors were investigated to study the waterway characters. The results show that most of the rivers took place silting. The specific results are that, at the Jiulongpo and the Jinshaqi areas, the sediment deposition grew higher 1-2m and 1-3m, respectively, and at the Zhuerqi zone, there was a few silting. The disadvantages of long-term impoundment process of the Three Gorges Reservoir on water transportation should be further explored in time.

Soil erosion and deposition in the new shorelines of the Three Gorges Reservoir

2017 ◽  
Vol 599-600 ◽  
pp. 1485-1492 ◽  
Author(s):  
Xiaolei Su ◽  
Christer Nilsson ◽  
Francesca Pilotto ◽  
Songping Liu ◽  
Shaohua Shi ◽  
...  
Keyword(s):  
Soil Erosion ◽  
Three Gorges Reservoir ◽  
Three Gorges ◽  
Erosion And Deposition ◽  
The Three Gorges Reservoir ◽  
The Three Gorges
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