3次元モデルによる鳥取県東郷池の潮流および塩分侵入に関する解析

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In brackish lakes undergoing artificial salinity management, demonstrating countermeasure scenarios for optimum salinity management to protect water environments and increase the production of water resources is a very important issue. In fundamental research on this issue, the authors constructed a three-dimensional numerical model utilizing the operator splitting method to examine lake currents and salinity dispersion. We applied this model to Lake Togo in Tottori Prefecture, and studied the effects of wind speeds on the flow patterns of wind driven currents, sea water intrusion processes, and density stratification formation processes. The results of this study indicated that the form of salinity intrusion could be categorized into three types: stratified type at a wind speed of 1m/s, partially mixed type at a wind speed of 3m/s and well mixed type at a wind speed of 6m/s, and that the formation of density stratification could be seen under wind speed conditions of 1m/s and 3m/s. At a wind speed of 6m/s, the strong mixture effect of the wind resulted in almost no density gradient in the water depth direction, suggesting that vertical circulation was taking place on a large scale throughout all regions of the lake. Furthermore, under all wind conditions, the intruded saline had reached all regions of the lake 54 hours after the start of calculations, and the saline reached a level of 4 psu or more in all regions of the lake 150 hours after the start of calculations.
日本雨水資源化システム学会の論文

3次元モデルによる鳥取県東郷池の潮流および塩分侵入に関する解析

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