Impact of the Three Gorges Project's Operation on Low Water Level in Changsha Reach

2014 ◽  
Vol 926-930 ◽  
pp. 4250-4253
Author(s):  
Chang Ying Chen ◽  
Yi Nong Chen ◽  
Xing Nong Zhang ◽  
Yao Ge
Keyword(s):  
Water Level ◽  
Dongting Lake ◽  
Three Gorges ◽  
Appearance Time ◽  
The Three Gorges ◽  
The Impact

In view of the seriously drought and the condition that the water level in Changsha reach continuously break the historical lowest records in recent years, the variation law of low water level in Changsha reach and the impact of the Three Gorges Projects operation on low water level were studied. The results show that the water level in the same discharge and the monthly averaged water level and the lowest water level all decrease year by year, and the appearance time of the lowest water level in recent years is earlier. The lowest water level in Changsha reach isnt much connected with the variation of water level in Dongting lake, but connected with the riverbed undercutting caused by the operation of hydro-junction and the excavation of sand. The appearance time advance of the lowest water level is connected with the Three Gorges Projects operation.

scholarly journals Quantifying the effects of channel change on the discharge diversion of Jingjiang Three Outlets after the operation of the Three Gorges Dam

2016 ◽  
Vol 47 (S1) ◽  
pp. 161-174 ◽  
Author(s):  
Yanyan Li ◽  
Guishan Yang ◽  
Bing Li ◽  
Rongrong Wan ◽  
Weili Duan ◽  
...  
Keyword(s):  
Water Level ◽  
Yangtze River ◽  
Flood Control ◽  
Dongting Lake ◽  
Three Gorges Dam ◽  
Three Gorges ◽  
Channel Change ◽  
Channel Changes ◽  
The Three Gorges ◽  
The Three Gorges Dam

The Jingjiang Three Outlets (JTO) are the water-sediment connecting channels between the Yangtze River and the Dongting Lake. The discharge diversion of the JTO plays a dominant role in the flood control of the middle–lower Yangtze River, Dongting Lake evolution, and ecological environment. After the operation of the Three Gorges Dam (TGD), the river channels downstream experienced dramatic channel changes. To study the influences of the channel change on the discharge diversion, the authors analyzed the channel changes by water level–discharge rating curves and cross-sectional channel profiles in 1980–2014. Hence, changes in the water level with the same discharge and the decline of discharge diversion at the JTO were noted. Channel incision caused the water level with the same discharge to greatly decrease in the upper Jingjiang River. The water level with the same discharge significantly increased at the JTO as a result of the channel deposition. The channel changes contributed approximately 37.74% and 76.36%, respectively, to the amount and ratio of discharge diversion decreases after the TGD operation. The channel changes serve as the primary factor in facilitating the decrease in the discharge diversion ratio, but not the main factor for the decreased amount of the discharge diversion.

Effects of seasonal water-level fluctuation on soil pore structure in the Three Gorges Reservoir, China

2018 ◽  
Vol 15 (10) ◽  
pp. 2192-2206 ◽  
Author(s):  
Shu-juan Zhang ◽  
Qiang Tang ◽  
Yu-hai Bao ◽  
Xiu-bin He ◽  
Feng-xia Tian ◽  
...  
Keyword(s):  
Pore Structure ◽  
Water Level ◽  
Three Gorges Reservoir ◽  
Water Level Fluctuation ◽  
Level Fluctuation ◽  
Three Gorges ◽  
The Three Gorges Reservoir ◽  
The Three Gorges
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