Influence of the Three Gorges Project on saltwater intrusion in the Yangtze River Estuary

2008 ◽  
Vol 56 (8) ◽  
pp. 1679-1686 ◽  
Author(s):  
Qiang An ◽  
Yanqing Wu ◽  
Shauna Taylor ◽  
Bin Zhao
Keyword(s):  
Saltwater Intrusion ◽  
Yangtze River ◽  
River Estuary ◽  
Yangtze River Estuary ◽  
Three Gorges Project ◽  
Three Gorges ◽  
The Yangtze River ◽  
The Three Gorges ◽  
The Yangtze River Estuary ◽  
The Three Gorges Project

scholarly journals Change characteristics of DSi and nutrition structure at the Yangtze River Estuary after Three Gorges Project impounding and their ecological effect

2017 ◽  
Vol 43 (2) ◽  
pp. 74-79 ◽  
Author(s):  
Lei Li ◽  
Xinqiang Shen ◽  
Mei Jiang
Keyword(s):  
Yangtze River ◽  
Inorganic Nitrogen ◽  
River Estuary ◽  
Ecological Effect ◽  
Yangtze River Estuary ◽  
Three Gorges Project ◽  
Ecosystem Structure ◽  
Three Gorges ◽  
The Yangtze River ◽  
The Yangtze River Estuary

Abstract The variation law of dissolved silica (DSi), dissolved inorganic nitrogen (DIN), dissolved inorganic phosphorus (DIP) and nutrition structure after the Three Gorges Project (TGP) impounding as well as their ecological effect were analyzed according to monitoring survey of the Yangtze River Estuary in spring (May) and summer (August) from 2004-2009. The results showed that after impounding, DSi and DIN concentration decreased and increased, respectively. During the study period, DSi decreased by about 63%, while DIN almost tripled. DIP concentration fluctuated slightly. With respect to nutrition structure, N:P increased, whereas Si:P and Si:N declined. According to chemometry standard of nutrient limits, nutrition structure tended to be imbalanced and the limiting factor of phytoplankton growth (P) was studied. Changes of nutrition structure have largely decreased diatom and caused different composition of dominant phytoplankton species. This may change ecosystem structure of the Yangtze River Estuary.

Zonation of the landslide hazards in the forereservoir region of the Three Gorges Project on the Yangtze River

2001 ◽  
Vol 59 (1-2) ◽  
pp. 51-58 ◽  
Author(s):  
Shuren Wu ◽  
Ling Shi ◽  
Reijiang Wang ◽  
Chengxuan Tan ◽  
Daogong Hu ◽  
...  
Keyword(s):  
Yangtze River ◽  
Three Gorges Project ◽  
Three Gorges ◽  
The Yangtze River ◽  
The Three Gorges ◽  
Landslide Hazards ◽  
The Three Gorges Project

scholarly journals Impacts of Three Gorges Dam's operation on spatial–temporal patterns of tide–river dynamics in the Yangtze River estuary, China

Ocean Science ◽  
2019 ◽  
Vol 15 (3) ◽  
pp. 583-599 ◽  
Author(s):  
Huayang Cai ◽  
Xianyi Zhang ◽  
Min Zhang ◽  
Leicheng Guo ◽  
Feng Liu ◽  
...  
Keyword(s):  
Yangtze River ◽  
Flood Control ◽  
River Estuary ◽  
Temporal Patterns ◽  
Freshwater Discharge ◽  
Yangtze River Estuary ◽  
Three Gorges ◽  
The Yangtze River ◽  
River Dynamics ◽  
The Yangtze River Estuary

Abstract. The Three Gorges Dam (TGD), located in the main stream of the Yangtze River, is the world's largest hydroelectric station in terms of installed power capacity. It was demonstrated that the TGD had caused considerable modifications in the downstream freshwater discharge due to its seasonal operation mode of multiple utilisation for flood control, irrigation, and power generation. To understand the impacts of the freshwater regulation of the TGD, an analytical model is adopted to explore how the operation of the TGD may affect the spatial–temporal patterns of tide–river dynamics in the Yangtze River estuary. We evaluated the effect of the TGD by comparing the changes in major tide–river dynamics in the post-TGD period (2003–2014) with those in the pre-TGD period (1979–1984). The results indicate that the strongest impacts occurred during the autumn and winter, corresponding to a substantial reduction in freshwater discharge during the wet-to-dry transition period and slightly increased discharge during the dry season. The underlying mechanism leading to changes in the tide–river dynamics lies in the alteration of freshwater discharge, while the impact of geometric change is minimal. Overall, the results suggest that the spatial–temporal pattern of tide–river dynamics is sensitive to the freshwater regulation of the TGD, so that the ecosystem function of the estuary may undergo profound disturbances. The results obtained from this study can be used to set scientific guidelines for water resource management (e.g. navigation, flood control, salt intrusion) in dam-controlled estuarine systems.

scholarly journals Effects of the Three Gorges Project on Runoff and Related Benefits of the Key Regions along Main Branches of the Yangtze River

Water ◽  
2019 ◽  
Vol 11 (2) ◽  
pp. 269 ◽  
Author(s):  
Yanjun Gao ◽  
Yongqiang Zhang
Keyword(s):  
Yangtze River ◽  
Flood Control ◽  
Three Gorges Project ◽  
Three Gorges ◽  
The Yangtze River ◽  
Annual Fluctuation ◽  
The Core ◽  
The Three Gorges ◽  
Core Areas ◽  
The Three Gorges Project

The Three Gorges Project (TGP) is the largest hydroelectric project in the world. It is crucial to understand the relationship between runoff regime changes and TGP’s full operation after 2009 in the Yangtze River Basin (YRB). This paper defines core, extended and buffer areas of YRB, analyzes the effects of TGP on runoff anomaly (RA), runoff variation (RV) and change of coefficient of variation (CCV) between two periods (2003–2008 and 2009–2016), takes percentage of runoff anomaly (PRA) as the evaluation standard, assures alleviation effect on severe dry and wet years of the research area, and finally summarizes related benefits of flood control from TGP. Our results indicate the inter-annual fluctuation of runoff in the core and extended areas expanded, but reduced in the buffer areas, and the frequencies of severe dry and wet years alleviated in the buffer, core and extended areas. Generally, the extended and core areas become less wet, and the buffer areas become less dry. The RV and CCV are both strengthened in the extended and core areas, but are weakened in the buffer areas, and RV is well positively correlated (R2 = 0.80) to CCV. Furthermore, the main benefits of TGP on flood control are remarkable in the reduction of disaster affected population, the decrease of agricultural disaster-damaged area, and the decline of direct economic loss. However, due to torrentially seasonal and non-seasonal precipitation, the sharp rebounds of three standards for Hubei and Anhui occurred in 2010 and 2016, and the percentage of agricultural damage area of five regions in the core and extended areas did not decline synchronously and performed irregularly. Our results suggest that the five key regions along the main branches of the Yangtze River should establish a flood control system and promote the connectivity of infrastructures at different levels to meet the significant functions of TGP. It is a great challenge for TGP operation to balance the benefits and conflicts among flood control, power generation and water resources supply in the future.

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