scholarly journals Using a Complex Network to Analyze the Effects of the Three Gorges Dam on Water Level Fluctuation in Poyang Lake

2019 ◽  
Vol 8 (11) ◽  
pp. 470 ◽  
Author(s):  
Ning ◽  
Zhou ◽  
Cheng ◽  
Ye ◽  
Shen
Keyword(s):  
Water Level ◽  
Complex Network ◽  
Frequency Distribution ◽  
Water Level Fluctuation ◽  
Three Gorges Dam ◽  
Severe Drought ◽  
Level Fluctuation ◽  
Three Gorges ◽  
The Three Gorges ◽  
The Three Gorges Dam

Because the Three Gorges Dam (TGD) has disturbed the normal hydrological regime downstream, analyzing the influence of the TGD on water level fluctuation is of great importance to ecological planning. The distribution and dynamic of the water level before and after the TGD were analyzed using frequency distribution and a complex network. Frequency distribution was unimodal before the TGD, and the peak ranged from 13–15 m. Frequency distribution was bimodal after TGD and two peaks ranged from 9–10 m and 16–17 m. The number of days when the water level was above warning level was reduced, and it was increased when the water level was below the ecological level. Further, the TGD had little effect on the number of days of rapid water level rising, which mainly existed during the flood season. However, this imposed a greater influence on the number of days of rapid water level decline, which implies a weaker intensity of the recession process, along with a longer duration. Thirdly, in winter and spring, the water level after the TGD was lower than that before the TGD by approximately 1 m. In summer, the number of days when the water level was above warning level was reduced. In autumn, the frequency distribution changed from unimodal to bimodal. The TGD has the greatest influence during the winter, which resulted in a lower water level and more severe drought.

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

Impact of water level fluctuation on avian community and diversity in Hanfeng Lake of the Three Gorges Reservoir

2018 ◽  
Vol 38 (4) ◽  
Author(s):  
刁元彬 DIAO Yuanbin ◽  
刘红 LIU Hong ◽  
袁兴中 YUAN Xingzhong ◽  
张乔勇 ZHANG Qiaoyong ◽  
熊森 XIONG Sen ◽  
...  
Keyword(s):  
Water Level ◽  
Three Gorges Reservoir ◽  
Water Level Fluctuation ◽  
Level Fluctuation ◽  
Three Gorges ◽  
Avian Community ◽  
The Three Gorges Reservoir ◽  
The Three Gorges

Performance of Soil-Root System of Setaria viridis Community in Soil Reinforcement and Slope Protection on the Water-Level-Fluctuation Belt in the Three Gorges Reservoir Region

2013 ◽  
Vol 773 ◽  
pp. 794-799 ◽  
Author(s):  
Jun Hua Mao ◽  
Jin Xia Zhang ◽  
Fang Qing Chen
Keyword(s):  
Water Level ◽  
Root System ◽  
Three Gorges Reservoir ◽  
Root Systems ◽  
Water Level Fluctuation ◽  
Soil Reinforcement ◽  
Level Fluctuation ◽  
Three Gorges ◽  
Setaria Viridis ◽  
The Three Gorges

The soil-root system formatted by plant roots and soil has a good effect in soil reinforcement and slope protection. Setaria viridis is a common species distributing in the three gorges reservoir region. In order to determine the performance of the species in soil reinforcement and slope protection and its variation characteristics on the water-level-fluctuation belt, we tested the tensile strength, anti-scouribility, anti-erodibility and shear resistance of the community soil-root systems. The results showed that the root system of S. viridis community grew better with the increase of altitude under the influence of water level fluctuation. The soil - root system of S. viridis community has an effect on soil reinforcement and slope protection. Its tensile strength of roots ranged from 60 to 90 Kpa/mm2,and its anti-scouribility enhancement coefficient, soil anti-erodibility enhancement coefficient and shear strength of soil-root system reached 0.15 to 0.90, 0.30 to 0.73, and 9 to 24 Kpa respectively. Its effects in soil reinforcement increased with the altitude increases. The correlation analysis indicated that the effects related significantly with root biomass. It is concluded that spatial changes of effects of soil-root systems in its soil reinforcement and slope protection might result from difference of root growth caused by water level fluctuation.

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.

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