Effects of the impounding process during the flood season on algal blooms in Xiangxi Bay in the Three Gorges Reservoir, China

2019 ◽  
Vol 392 ◽  
pp. 236-249 ◽  
Author(s):  
Mingying Chuo ◽  
Jun Ma ◽  
Defu Liu ◽  
Zhengjian Yang
Keyword(s):  
Algal Blooms ◽  
Three Gorges Reservoir ◽  
Three Gorges ◽  
The Three Gorges Reservoir ◽  
Flood Season ◽  
The Three Gorges ◽  
Xiangxi Bay

scholarly journals Application of 2D Hydrodynamic Model for the Assessment of the Influencing Factor in Xiangxi Bay of the Three Gorges Reservoir, China

2021 ◽  
Author(s):  
RANOJIT KUMAR DUTTA ◽  
BAISHAKHI DAS
Keyword(s):  
Algal Blooms ◽  
Three Gorges Reservoir ◽  
Influencing Factor ◽  
Travel Distance ◽  
Three Gorges ◽  
Density Currents ◽  
Quality Model ◽  
The Three Gorges Reservoir ◽  
The Three Gorges ◽  
Xiangxi Bay

Abstract A two-dimensional (2D), laterally averaged, hydrodynamic and water quality model, CE-QUAL-W2, was used to simulate the hydrodynamics and water temperatures of Xiangxi Bay (XXB) of the Three Gorges Reservoir (TGR). Algal blooms occurred seasonally in XXB which is influenced by density currents. The CE-QUAL-W2 model was calibrated using data collected in XXB from January to December 2010. The model was then used to examine the environmental factors that affect the density currents. The model predicted density currents such as overflows, interflows and underflows of the XXB. The results suggest that more than 25%, 58.33% and 16.67% of the density currents that occurred in the XXB were overflow, interflow and underflow, respectively. Field observations were conducted including travel distance and thickness of intrusion layer for 24 days in 2010. The average travel distance of overflow, interflow and underflow in XXB was 15.50 km, 8.78 km, and 9 km based on observations and 16 km, 9.40 km, 9.60 km based on the model results. Therefore, numerical simulations of density currents can be predicted to better understand the hydrodynamics and aquatic ecosystems in XXB of TGR.

scholarly journals Application of a 2D hydrodynamic model for the assessment of the influencing factor in Xiangxi Bay of the Three Gorges Reservoir

2021 ◽  
Author(s):  
RANOJIT KUMAR DUTTA ◽  
Baishakhi Das
Keyword(s):  
Algal Blooms ◽  
Three Gorges Reservoir ◽  
Influencing Factor ◽  
Travel Distance ◽  
Three Gorges ◽  
Density Currents ◽  
Quality Model ◽  
The Three Gorges Reservoir ◽  
The Three Gorges ◽  
Xiangxi Bay

Abstract A two-dimensional (2D), laterally averaged, hydrodynamic and water quality model, CE-QUAL-W2, was used to simulate the hydrodynamics and water temperatures of Xiangxi Bay (XXB) of the Three Gorges Reservoir (TGR). Algal blooms occurred seasonally in XXB which is influenced by density currents. The CE-QUAL-W2 model was calibrated using data collected in XXB from January to December 2010. The model was then used to examine the environmental factors that affect the density currents. The model predicted density currents such as overflows, interflows and underflows of the XXB. The results suggest that more than 25%, 58.33% and 16.67% of the density currents that occurred in the XXB were overflow, interflow and underflow, respectively. Field observations were conducted including travel distance and thickness of intrusion layer for 24 days in 2010. The average travel distance of overflow, interflow and underflow in XXB was 15.50 km, 8.78 km, and 9 km based on observations and 16 km, 9.40 km, 9.60 km based on the model results. Therefore, numerical simulations of density currents can be predicted to better understand the hydrodynamics and aquatic ecosystems in XXB of TGR.

Dynamics of main nutrient input to Xiangxi Bay of the Three-Gorges Reservoir

2008 ◽  
Vol 28 (5) ◽  
pp. 2073-2079 ◽  
Author(s):  
Li Fengqing ◽  
Ye Lin ◽  
Liu Ruiqiu ◽  
Cao Ming ◽  
Cai Qinghua
Keyword(s):  
Three Gorges Reservoir ◽  
Three Gorges ◽  
Nutrient Input ◽  
The Three Gorges Reservoir ◽  
The Three Gorges ◽  
Xiangxi Bay

scholarly journals Temporal variation of methane flux from Xiangxi Bay of the Three Gorges Reservoir

2013 ◽  
Vol 3 (1) ◽  
Author(s):  
Shangbin Xiao ◽  
Defu Liu ◽  
Yuchun Wang ◽  
Zhengjian Yang ◽  
Wenzhong Chen
Keyword(s):  
Temporal Variation ◽  
Three Gorges Reservoir ◽  
Methane Flux ◽  
Three Gorges ◽  
The Three Gorges Reservoir ◽  
The Three Gorges ◽  
Xiangxi Bay

A real-time operation of the Three Gorges Reservoir with flood risk analysis

2015 ◽  
Vol 16 (2) ◽  
pp. 551-562 ◽  
Author(s):  
Yixiang Sun ◽  
Deshan Tang ◽  
Huichao Dai ◽  
Pan Liu ◽  
Yifei Sun ◽  
...  
Keyword(s):  
Risk Analysis ◽  
Flood Risk ◽  
Reservoir Operation ◽  
Three Gorges Reservoir ◽  
Three Gorges ◽  
Hydropower Generation ◽  
Inference System ◽  
The Three Gorges Reservoir ◽  
Flood Season ◽  
The Three Gorges

Risk analysis is essential to reservoir operation. In this study, a new analysis for reservoir operation is proposed to enhance the utilization rate of the flood water from the Three Gorges Reservoir (TGR) during the flood season. Based on five scenarios of hydrology forecasting with the adaptive neuro-fuzzy inference system (ANFIS), a multi-objective optimum operation was implemented employing the risk control constraints of the genetic algorithm (GA) for the TGR. The results of this analysis indicated that the optimum hydropower generation was 5.7% higher than the usual operating hydropower generation, which suggested that, during flood season, it would be beneficial to increase hydropower generation from reservoirs, while maintaining a safe degree of flood risk.

Analysis of the Three Gorges Reservoir Operation on the Water Level of Yangtze River during the Non-Flood Season

2013 ◽  
Vol 864-867 ◽  
pp. 2207-2212 ◽  
Author(s):  
Jing Zheng
Keyword(s):  
Water Level ◽  
Yangtze River ◽  
Three Gorges Reservoir ◽  
Water Levels ◽  
Three Gorges ◽  
The Yangtze River ◽  
The Three Gorges Reservoir ◽  
Flood Season ◽  
The Three Gorges ◽  
Downstream Area

In the middle and downstream area of the Yangtze River, low water levels had occurred at post-flood season or before the flood season in recent years, since the trial impoundment of the Three Gorges Reservoir (TGR) in 2008. Based on the analysis of the low water levels, both rating curve of main stations in the middle and lower reaches of the Yangtze River and the operation of TGR in the dry season were analyzed in study to reveal the effects of the impoundment of TGR on water level of downstream areas. The research results show that the water supplement of the TGR could raise the downstream water level, which has positive effect on water supplement and navigation in this area.

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