scholarly journals Did the gonads of the Chinese sturgeon below the Gezhouba Dam degenerate seriously?

2020 ◽  
Vol 32 (4) ◽  
pp. 915-923
Author(s):  
HUANG Zhenli ◽  
◽  
WANG Luhai
Keyword(s):  
Chinese Sturgeon ◽  
Gezhouba Dam

scholarly journals Optimization of the flow conditions in the spawning ground of the Chinese sturgeon (Acipenser sinensis) through Gezhouba Dam generating units

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Anyang Huang ◽  
Jinzhong Yao ◽  
Jiazhi Zhu ◽  
Xingchen Gao ◽  
Wei Jiang
Keyword(s):  
Spawning Ground ◽  
Chinese Sturgeon ◽  
Flow Conditions ◽  
Velocity Measurements ◽  
Acipenser Sinensis ◽  
Critically Endangered Species ◽  
Gezhouba Dam ◽  
Opening Mode ◽  
Suitable Area ◽  
Good Agreement

AbstractChinese sturgeon (Acipenser sinensis) is a critically endangered species, and waters downstream from Gezhouba Dam are the only known spawning ground. To optimize the velocity conditions in the spawning ground by controlling the opening mode of Gezhouba Dam generator units, a mathematical model of Chinese sturgeon spawning ground was established in FLOW-3D. The model was evaluated with velocity measurements, and the results were determined to be in good agreement. By inverting the 2016–2019 field monitoring results, the model shows that the preferred velocity range for Chinese sturgeon spawning is 0.6–1.5 m/s. Velocity fields of different opening modes of the generator units were simulated with identical discharge. The suitable-velocity area was maximal when all units of Dajiang Plant of Gezhouba Dam were open. For discharges below 12,000 m3/s, most of the area was suitable; for discharges above 12,000 m3/s, the suitable area rapidly decreased with increasing discharge. A comparison of suitable areas under high-flow showed that at discharges of 12,000–15,000 m3/s, opening 11–13 units on the left side was optimal. For discharges above 15,000 m3/s, all units should be open. We used these results to recommend a new operation scheme to support the conservation of Chinese sturgeon.

Hydrology and Water Quality Survey Near the Gezhouba Dam in the Winter

2013 ◽  
Vol 726-731 ◽  
pp. 3256-3261
Author(s):  
Jia Fei Zhou ◽  
Cong Feng Wang ◽  
De Fu Liu ◽  
Jing Wen Xiang ◽  
Ping Zhao ◽  
...  
Keyword(s):  
Water Quality ◽  
Dissolved Oxygen ◽  
Water Temperature ◽  
Flow Velocity ◽  
Water Column ◽  
Quality Data ◽  
Chinese Sturgeon ◽  
Water Quality Data ◽  
Gezhouba Dam ◽  
Survival Condition

Filed hydrology and water quality data were collected near the Gezhouba Dam early December of 2012 to analyze the response of Chinese Sturgeon survival condition to water temperature, dissolved oxygen (DO), pH, transparency (SD) and bottom flow-velocity. The results showed that water temperature lag is unconspicuous. The water temperature of Gezhouba Dam Sanjiang (GDS) was lower than that of Gezhouba Dam River (GDR), and it hindered propagation of sturgeon eggs. DO decreased fast in the vertical water column of GDS, pH ranged from 7.5 to 7.71. The hydrology and water quality were suitable for the life condition of sturgeon eggs and fry, except index of bottom flow-velocity.

Changes of Bottom Substrate Characteristics in Spawning Ground 0f Chinese Sturgeon Downstream the Gezhouba Dam from Impounding of Three Gorge Reservoir

2015 ◽  
Vol 35 (9) ◽  
Author(s):  
杜浩 DU Hao ◽  
危起伟 WEI Qiwei ◽  
张辉 ZHANG Hui ◽  
王成友 WANG Chengyou ◽  
吴金明 WU Jinming ◽  
...  
Keyword(s):  
Spawning Ground ◽  
Chinese Sturgeon ◽  
Bottom Substrate ◽  
Gezhouba Dam ◽  
Gorge Reservoir ◽  
Three Gorge Reservoir

Effect of Release Temperature from Three Gorges Reservoir on the Procreation of Chinese Sturgeons

2013 ◽  
Vol 361-363 ◽  
pp. 958-961
Author(s):  
Shan Shan Lu ◽  
Ling Quan Dai ◽  
Hui Chao Dai ◽  
Jing Qiao Mao
Keyword(s):  
Three Gorges Reservoir ◽  
Coupled Model ◽  
Ecological Factors ◽  
Limiting Factor ◽  
Three Gorges ◽  
Chinese Sturgeon ◽  
Endangered Fish ◽  
Temperature Changes ◽  
Gezhouba Dam ◽  
Dam Site

Chinese sturgeon is the national list endangered fish species. Since the construction of the Gezhouba dam in 1981, the migration of Chinese sturgeon for procreating to upstream of the Yangtze River has been blocked which cause the only spawning ground was left locating in a narrow zone downstream close to the dam site. The procreation of Chinese sturgeons need suitable ecological factors, including temperature, hydrology, sediment and so on, but after impoundment of Three Gorges Reservoir (TGR), the environment have changed a lot that brings a great threaten to the Chinese sturgeons. In this paper, based on previous hydrodynamics and thermal coupled model of TGR, three different scenarios including dry, normal and wet year is simulated to access the influences of release temperature from TGR on procreation of Chinese sturgeons. The result indicates that due to the weak stratification of the TGR, the release temperature changes compared to natural river water temperature, as a result, the time of the procreation is slightly delayed in different scenarios because the release temperature is higher than the upper bound temperature for spawning, of which the days been delayed is about 14 in dry years, 13 in normal years and 5 in wet years, respectively, so temperature becomes a limiting factor to the procreation of Chinese sturgeons.

scholarly journals Optimization of the Flow Conditions in the Spawning Grounds of the Chinese Sturgeon (Acipenser Sinensis) Through Gezhouba Dam Generating Units

2021 ◽  
Author(s):  
Anyang Huang ◽  
Jinzhong Yao ◽  
Jiazhi Zhu ◽  
Xingchen Gao ◽  
Wei Jiang
Keyword(s):  
Chinese Sturgeon ◽  
Flow Conditions ◽  
Velocity Measurements ◽  
Spawning Grounds ◽  
Acipenser Sinensis ◽  
Critically Endangered Species ◽  
Gezhouba Dam ◽  
Opening Mode ◽  
Suitable Area ◽  
Good Agreement

Abstract Chinese sturgeon (Acipenser sinensis) is a critically endangered species, and waters downstream from Gezhouba Dam are the only known spawning grounds. To optimize the velocity conditions in the spawning grounds by controlling the opening mode of Gezhouba Dam generator units, a mathematical model of Chinese sturgeon spawning grounds was established in FLOW-3D. The model was evaluated with velocity measurements, and the results was determined to be in good agreement. By inverting the 2016-2019 field monitoring results, the model shows that the preferred velocity range for Chinese sturgeon spawning is 0.6-1.5 m/s. Velocity fields of different opening modes of the generator units were simulated with identical discharge. The suitable-velocity area was maximal when all units of Dajiang Plant of Gezhouba Dam were open. For discharges below 12000 m3/s, most of the area was suitable; for discharges above 12000 m3/s, the suitable area rapidly decreased with increasing discharge. A comparison of suitable areas under high-flow showed that at discharges of 12000~15000 m3/s, opening 11~13 units on the left side was optimal. For discharges above 15000 m3/s, all units should be open. We used these results to recommend a new operation scheme to support the conservation of Chinese sturgeon.

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