Spatial and seasonal distribution of phosphorus in the mainstem within the Three Gorges Reservoir before and after impoundment

2015 ◽  
Vol 73 (3) ◽  
pp. 636-642 ◽  
Author(s):  
Baofeng Lou ◽  
Shiyong Yin
Keyword(s):  
Water Level ◽  
Three Gorges Reservoir ◽  
Suspended Solids ◽  
Seasonal Distribution ◽  
Three Gorges ◽  
Target Level ◽  
Wet Season ◽  
The Three Gorges Reservoir ◽  
The Three Gorges ◽  
Before And After

The Three Gorges Reservoir (TGR) began to store water in 2003. The water level reached 135 m in 2003, 156 m in 2006, 172 m in 2008 and 175 m (target level) in every year from 2010 through 2013. Impacts of dams on the environment are a concern all over the world. A major concern for reservoirs is phosphorus and possible eutrophication. Therefore, total phosphorus (TP) in the TGR mainstem was determined at five stations (S1–S5) from 1998 through 2013 to investigate variations of phosphorus with water level elevations. Results revealed that a new spatial and seasonal TP distribution has occurred after the impoundment. TP levels in the reach between S3 (nearly 300 km from the dam) and S5 (near the dam) have decreased sharply compared with those before the impoundment. The reduction degree of TP in wet season was greater than in dry season. Additionally, TP spatially decreased from upstream to the dam after the impoundment. The reduction of TP levels was mainly attributed to the settling of suspended solids and adsorbed phosphorus. These findings will inform research about transport and fate of phosphorus in TGR and Yangtze River. The challenge remains to implement measures to limit the release of phosphorus from sediments.

Regulation of Laijiapu Waterway in Jingjiang Reach

2014 ◽  
Vol 501-504 ◽  
pp. 2001-2006
Author(s):  
Ya Liu ◽  
Li Zheng ◽  
Cheng Tao Huang ◽  
Zhao Biao Huang ◽  
Lin Liu
Keyword(s):  
Yangtze River ◽  
Three Gorges Reservoir ◽  
Three Gorges ◽  
The Yangtze River ◽  
Point Bar ◽  
The Three Gorges Reservoir ◽  
The Three Gorges ◽  
Before And After ◽  
The Stability ◽  
Channel Bar

After impoundment of the Three Gorges Reservoir, Jingjiang reach, in the middle of the Yangtze River, has gradually shown a series of atypical fluvial features, adversely affecting the maintenance of waterways. Citing the Laijiapu Waterway, a meandering segment in the lower Jingjiang for example, this paper compared the fluvial features of the channel before and after the impoundment, summed up its navigation-obstructing features, and proposed guarding the point bar on the convex bank and channel bar in the widening section as a key to maintaining the stability of the navigation channels.

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

scholarly journals Precipitation Changes in the Three Gorges Reservoir Area and the Relationship with Water Level Change

Sensors ◽  
2021 ◽  
Vol 21 (18) ◽  
pp. 6110
Author(s):  
Qin Li ◽  
Xiuguo Liu ◽  
Yulong Zhong ◽  
Mengmeng Wang ◽  
Manxing Shi
Keyword(s):  
Water Level ◽  
Three Gorges Reservoir ◽  
Precipitation Anomaly ◽  
Three Gorges Reservoir Area ◽  
Three Gorges ◽  
Reservoir Area ◽  
Precipitation Concentration ◽  
The Three Gorges ◽  
Before And After ◽  
Precipitation Changes

As the largest hydroelectric project worldwide, previous studies indicate that the Three Gorges Dam (TGD) affects the local climate because of the changes of hydrological cycle caused by the impounding and draining of the TGD. However, previous studies do not analyze the long-term precipitation changes before and after the impoundment, and the variation characteristics of local precipitation remain elusive. In this study, we use precipitation anomaly data derived from the CN05.1 precipitation dataset between 1988 and 2017 to trace the changes of precipitation before and after the construction of the TGD (i.e., 1988–2002 and 2003–2017), in the Three Gorges Reservoir Area (TGRA). Results showed that the annual and dry season precipitation anomaly in the TGRA presented an increasing trend, and the precipitation anomaly showed a slight decrease during the flood season. After the impoundment of TGD, the precipitation concentration degree in the TGRA decreased, indicating that the precipitation became increasingly uniform, and the precipitation concentration period insignificantly increased. A resonance phenomenon between the monthly average water level and precipitation anomaly occurred in the TGRA after 2011 and showed a positive correlation. Our findings revealed the change of local precipitation characteristics before and after the impoundment of TGD and showed strong evidence that this change had a close relationship with the water level.

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