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Hamagami K.,Laboratory of Bioproduction and Environment Information science | Hamagami K.,Kyushu University | Mori K.,Laboratory of Bioproduction and Environment Information science | Hirai Y.,Laboratory of Bioproduction and Environment Information science
Journal of the Faculty of Agriculture, Kyushu University | Year: 2010

In a closed water body with compound cross section, we examined the effects of horizontal convection based on the horizontal density difference on the characteristics of thermal convection generated by radiational cooling at water surface. An experiment for measuring water temperature revealed that the fluid exchange was done by the horizontal convection based on the density difference between deep and shallow parts. Moreover, a flow visualization experiment to investigate the characteristics of thermal, which are developmental factors in vertical convection, found that the generation frequency and the generation interval of thermals was higher in the case of compound cross section than the case of even depth. That is, it was understood that the change of the development characteristics of the mixed layer (vertical convection) based on the effect of horizontal convection occurred by the change of occurrence characteristics of the thermals. Source


Hamagami K.,Laboratory of Bioproduction and Environment Information science | Hamagami K.,Kyushu University | Mori K.,Laboratory of Bioproduction and Environment Information science | Hirai Y.,Laboratory of Bioproduction and Environment Information science
Journal of the Faculty of Agriculture, Kyushu University | Year: 2010

The characteristics of thermal convection in a closed water body with compound cross section were examined by experiment for measuring water temperature and flow visualization experiment, and considered the influence of the horizontal convection based on the horizontal density difference. A experiment for measuring water temperature revealed that there was little difference in the water temperature in each part though there was a difference of the heat flux on the water surface between the deep and shallow parts, that is, the fluid exchange was immediately done between both parts. Moreover, a flow visualization experiment and the theoretical analysis of the characteristics of the mixed layer found that the horizontal convection based on the density difference between the deep and shallow parts exerted an influence on the time change of the decreasing velocity of the water temperature in the mixed layer and also the developmental velocity of the mixed layer in the deep part. Source

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