MODEL ANALYSIS CONSIDERING BOTTOM HEAT TRANSFER ON WEAK THERMAL STRATIFICATION IN LAKE SUWA

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  • 底面熱輸送を考慮した諏訪湖の弱い水温成層形成に関するモデル解析

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<p> Shallow lakes are more susceptible to the effects of climate and climatic changes than deep lakes and dams because of their small depth. In shallow lakes, diurnal stratification occurs during daytime with mixing during nighttime, although it is not easy to model and analyze the effects of diurnal stratification. In this study, after preparing wind condition and estimation of temperature of inflowing river water, we aimed to improve the simulation of water temperature stratification in Lake Suwa by using a bottom heat transfer model that can take into account the cooling effect of mud at the bottom of the lake. The results suggested that the mud layer at the bottom of Lake Suwa cools the bottom water mass directly in summer period when the temperature is vertically stratified, and the hydrodynamic model coupled with the bottom heat transfer model would effectively simulate the structure of the theramal stratification in summer. Meanwhile, lowering the inflow river temperature as a boundary condition did not have a significant effect on the reproduction of low temperature in summer bottom layer.</p>

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