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Laterally averaged two-dimensional modeling of thermal structure in river-type reservoirs |
Dai Lingquan1,2, Dai Huichao1,2, Mao Jingqiao2, Jiang Dingguo1 |
1.College of Hydraulic and Environmental Engineering, China Three Gorges University, Yichang, Hubei 443002, China; 2.College of Water Conservancy and Hydropower Engineering, Hohai University, Nanjing, Jiangsu 210098, China |
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Abstract The impoundment of the reservoirs has a strong influence on the hydrologic regime of the natural river course, and the water thermal structure characteristics maybe change at the same time. In this work, a laterally averaged two-dimensional model for river-type reservoirs to simulate water temperature is developed. Taking the Three Gorges Reservoir(TGR)show as an example, the thermal structure after the operation of the TGR is predicted based on a normal year and an extreme dry year. Results show that the temperature has marked difference in the longitudinal direction in Spring and Summer, the commonly used one-dimensional model is difficult to reflect the real vertical temperature distribution near far from the dam; the reservoir has no stable thermal stratification during the whole year in different typical years, but in Spring, a transient and weak stratification may arise, the maximum temperature difference in the vertical direction in a normal year is 8.14 ℃,while it is 8.82 ℃ in an extreme dry year. The regions of the large temperature gradient(<100.0 m)are located below the elevation of the power plant intake(130.0 m).The water in the region with the large temperature gradient does not affect the discharged flow from the Three Gorges Reserovir in Spring.Therefore, the results can provide a scientific basis for management of the ecological environment in the Three Gorges Reservoir.
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Received: 04 November 2014
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