Management and Construction of the Three Gorges Project

Dai, Huichao; Cao, Guizhou; Su, Huaizhi

doi:10.1061/(asce)0733-9364(2006)132:6(615)

Cited by 22 publications

(14 citation statements)

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“…The TGD reservoir is 600 km long with a surface area of 1084 km 2 and storage of 39.3 km 3 of water (Dai et al, 2006). It was built to help alleviate flooding on the Yangtze plain, for hydroelectric power generation and to improve upstream navigation.…”

Section: Introductionmentioning

confidence: 99%

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Climate change impacts on Yangtze River discharge at the Three Gorges Dam

Birkinshaw

Guerreiro

Nicholson

et al. 2017

Hydrol. Earth Syst. Sci.

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Abstract. The Yangtze River basin is home to more than 400 million people and contributes to nearly half of China's food production. Therefore, planning for climate change impacts on water resource discharges is essential. We used a physically based distributed hydrological model, Shetran, to simulate discharge in the Yangtze River just below the Three Gorges Dam at Yichang (1 007 200 km 2 ), obtaining an excellent match between simulated and measured daily discharge, with Nash-Sutcliffe efficiencies of 0.95 for the calibration period (1996)(1997)(1998)(1999)(2000) and 0.92 for the validation period (2001)(2002)(2003)(2004)(2005). We then used a simple monthly delta change approach for 78 climate model projections (35 different general circulation models -GCMs) from the Coupled Model Intercomparison Project Phase 5 (CMIP5) to examine the effect of climate change on river discharge for 2041-2070 for Representative Concentration Pathway 8.5. Projected changes to the basin's annual precipitation varied between −3.6 and +14.8 % but increases in temperature and consequently evapotranspiration (calculated using the Thornthwaite equation) were projected by all CMIP5 models, resulting in projected changes in the basin's annual discharge from −29.8 to +16.0 %. These large differences were mainly due to the predicted expansion of the summer monsoon north and west into the Yangtze Basin in some CMIP5 models, e.g. CanESM2, but not in others, e.g. CSIRO-Mk3-6-0. This was despite both models being able to simulate current climate well. Until projections of the strength and location of the monsoon under a future climate improve, large uncertainties in the direction and magnitude of future change in discharge for the Yangtze will remain.

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Section: Introductionmentioning

confidence: 99%

“…It was built to help alleviate flooding on the Yangtze plain, for hydroelectric power generation and to improve upstream navigation. Construction finished in 2012, when it was the largest hydropower dam in the world in terms of installed capacity, with a maximum output of 23 200 MW from 34 turbines (Dai et al, 2006).…”

Section: Introductionmentioning

confidence: 99%

Climate change impacts on Yangtze River discharge at the Three Gorges Dam

Birkinshaw

Guerreiro

Nicholson

et al. 2017

Hydrol. Earth Syst. Sci.

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show abstract

“…In fact, the environmental impact assessment was carried out during the planning and the verification phases. It was concluded that the project would create both positive and negative impacts on ecological environment but that the positive will prevail over the negative [27]. Before impoundment, many studies predicted that eutrophication and potential algal blooms would be one of the major negative impacts on this reservoir [28,29].…”

Section: Introductionmentioning

confidence: 99%

“…For example, Dai et al [27] pointed out that the drainage of sewage from the residential areas must be perfectly controlled for the purpose of the sustainable management of TGR system. On the other hand, if a bloom has been formed, it is possible to take into consideration three kinds of control measures: physical, chemical and biological.…”

Section: Introductionmentioning

confidence: 99%

Impacts of water release operations on algal blooms in a tributary bay of Three Gorges Reservoir

Zheng

Mao

Dai

et al. 2011

Sci. China Technol. Sci.

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Water release operation is crucial for water quality in large reservoirs such as Three Gorges Reservoir (TGR), because it determines the hydrodynamics and hence the self-purification capability. As algal blooms were often observed in some tributary bays of TGR during the release periods, high frequency field observations were carried out in a typical eutrophic tributary bay (Xiangxi River) from February 9 to May 10, 2009. In this paper we assess the hydrodynamic behaviour, density stratification, and trophic status in this bay, respectively using a series of observations for flow, physical, chemical and biological parameters . Then, we analyze the effects of reservoir release operations on algal blooms using correlation analysis method. An empirical prognosis is concluded for the likelihood of algal bloom occurrence as a function of daily fluctuation of water level (DFWL) and water temperature. Our results indicate that during the release period, the algal bloom occurrences are closely tied to the DFWL in that if the ratio of DFWL to total water depth ranges from 10×10 4 to 0, the possibility of algal blooms may reach up to 70%, and if the ratio is less than 10×10 4 , then that risk can be significantly reduced to less than 10%. This paper finally suggests that a wave-type water release operation should be beneficial in reducing bloom frequencies in the tributary water bodies, which is helpful for TGR water quality management, especially for the water release operation optimization.Three Gorges Reservoir, Xiangxi River, water release operation, algal bloom, water quality, wave-type operation

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“…There is a large body of research on the optimized operation of cascade reservoirs [1,2] . By time internal, there are long-term, short-term and daily optimization models.…”

Section: Introductionmentioning

confidence: 99%

Daily optimized model for long-term operation of the Three Gorges-Gezhouba Cascade Power Stations

Cao

Zhiguo

Liu

et al. 2007

Sci. China Ser. E-Technol. Sci.

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This paper presents the step-by-step genetic algorithm based on artificial intelligence guidance and builds a long-term daily optimized operating model for the Three Gorges-Gezhouba HydropowerComplex with single generating set as the based operating unit. Actual operating data from 2004 to 2006 are used to verify the model, and results show that the simulation accuracy determined by measuring the total amount of cascade power generation reaches 99.66%. Statistic hydrological data of normal years and actual data of three years of 2004-2006 are respectively used to perform an optimized prediction of the power generation process and benefits in future when the water stored in the TGP Reservoir reaches 175 m level and power generation benefits under different operation modes, such as delayed subsiding water level, advance water storage, and adopting of different flood-limited water levels, are forecasted. In the case of years with normal inflows, the total amount of cascade power generation running on current specifications reaches 107500 GWh per year. If the commencement of water storage after the flood season is moved forward by 20 days, the amount of power generation can be increased by 3400 GWh per year. If the limited water level in the flood season is raised by three to five meters, the amount of power generation can be increased by 1600 to 3200 GWh per year. If the commencement of water storage is moved forward while the maximum water level allowed in the flood season is raised, the amount of power generation can be increased by 6400 GWh per year. cascade operation, Three Gorges Project, genetic algorithm, optimization, forecast CAO GuangJing et al. Sci China Ser E-Tech Sci | Oct. 2007 | vol. 50 | Supp. I | 98-110 99

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Management and Construction of the Three Gorges Project

Cited by 22 publications

References 0 publications

Climate change impacts on Yangtze River discharge at the Three Gorges Dam

Climate change impacts on Yangtze River discharge at the Three Gorges Dam

Impacts of water release operations on algal blooms in a tributary bay of Three Gorges Reservoir

Daily optimized model for long-term operation of the Three Gorges-Gezhouba Cascade Power Stations

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