A two-dimensional numerical model of wind-induced flow and water quality in closed water bodies |
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Authors: | Bui Quoc Lap Ken Mori |
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Institution: | (1) Graduate School of Bioresource and Bioenvironmental Sciences, Kyushu University, Hakozaki 6-10-1, Higashi-ku 812-8581, Fukuoka, Japan;(2) Faculty of Agriculture, Kyushu University, Hakozaki 6-10-1, Higashi-ku 812-8581, Fukuoka, Japan |
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Abstract: | In closed water bodies, such as reservoirs and lakes, where the exchange with external waters is usually small, the wind-induced
flow significantly affects their water quality by mixing the surface waters and transfering heat down through the water column.
However, the circulation caused by wind acting on the water surface can be influenced by the excessive growth of aquatic plants
in summer, which may make their water quality to become worse. Therefore, understanding the response of the closed water bodies
to winds acting on the water surface is of great significance in examining and maintaining their water quality in good condition.
With that significance, this research has been done to build a two-dimensional, unsteady, laterally averaged model for simulating
the circulation and water quality in closed water bodies. To verify the model, the Tabiishidani reservoir located in Sasaguri
town, Fukuoka prefecture, Japan, was chosen as a case study. To illustrate the methodology of the research, water temperature
of the reservoir was chosen to calibrate the model. After calibration, the model was applied to simulate water temperature
in the Tabiishidani reservoir under different patterns of meteorology. The results of simulation clarified the change in water
temperature distribution along the depth of the reservoir under the different patterns of meteorology. This research shows
that the model can be a suitable tool for simulating the circulation and water temperature in closed water bodies. Moreover,
the model can be extended to simulate the circulation and any variable of water quality in closed water bodies with the coverage
of aquatic plants on the water surface. |
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Keywords: | Water environment Wind-induced flow Finite volume method Numerical simulation Field observation |
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