Abstract
Through numerical simulation using the three-dimensional Delft3D-Flow model, a unique phenomenon was found in a tropical, large, riverine reservoir in China on the Lancang-Mekong River, namely the Nuozhadu Reservoir. The surface water temperature rises significantly from the upper end of the reservoir to the dam, by about + 3.8 ℃ per 100 km, far exceeding the original longitudinal increase rate before construction of the reservoir. As a result, the water is always warmer than the air in front of the dam all the year round. Analysis illustrated that this phenomenon results from the strong solar radiation in the tropical region and the strong thermal stratification in the reservoir and the increase of surface water temperature is positively correlated with the hydraulic residence time. This phenomenon may have an important effect on the local environment; since there are many large, riverine reservoirs in tropical regions across the world, this study can serve as a reference for the management of the reservoirs with similar characteristics.
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Availability of Data and Materials
The authors are grateful to the China Meteorological Data Sharing Service System (http://cdc.cma.gov.cn/) for providing the meteorological data, and Huaneng Lancang River Hydropower Inc for providing the topography, flow rates, and field data, which contributed a lot to our research results reported in this paper. All the simulated results and measured data presented in this paper are available upon request to the corresponding author (zhudejun@tsinghua.edu.cn).
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Acknowledgements
This paper greatly benefited from the valuable discussion with and advice from Prof. Danxun Li from the Tsinghua University, Beijing, China.
Funding
The authors gratefully acknowledge the financial support from the National Key R&D Program of China (Grant No. 2022YFC3201803) and the National Natural Science Foundation of China (Grant No. U224320107).
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S Guo conducted the simulation and wrote the first draft of the paper. D Zhu conceptualized the research, improved the manuscript, and acquired funding. Y Chen discussed about the results and improved the manuscript.
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Guo, S., Zhu, D. & Chen, Y. Modelling and Analyzing a Unique Phenomenon of Surface Water Temperature Rise in a Tropical, Large, Riverine Reservoir. Water Resour Manage 37, 1711–1727 (2023). https://doi.org/10.1007/s11269-023-03450-y
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DOI: https://doi.org/10.1007/s11269-023-03450-y