著者

細田 尚 磯野 太俊

出版者

Japan Society of Civil Engineers

雑誌

応用力学論文集 (ISSN:13459139)

巻号頁・発行日

vol.11, pp.825-834, 2008

被引用文献数

1 1

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This paper describes the fundamental characteristics of vertical heat transfer due to thermal convection during the cooling period (September to February) in the northern part of Lake Biwa. The seasonal variations of the vertical water temperature and water quality distributions are firstly shown with the comparisons of calculated results by 1-D model and observed ones to explain the fundamental features of heat and mass transfer occurring in Lake Biwa through a year. Based on the examination of these results, it is pointed out that the thermal convection during the cooling period is the main mechanisms of DO transfer from the water surface to the bottom of lake. Then the mixing mechanism caused by thermal convection is investigated in detail numerically using 3-D CFD model. It is shown that thermal convection cells are observed in the computational domain, changing the positions of submerging portion temporally and promoting the mixing near the interface between the thermally stratified two layers. It is also pointed out that a fractal structure is observed in the flow generated by thermal convection.<BR>A stochastic model with Monte-Carlo simulation, which is similar to Ising model and forest gap model, is proposed to consider the results of numerical experiments. It is pointed out that the spatial flow structures can be simulated by the stochastic model qualitatively.