AM06-17-009 琵琶湖北湖を想定した冷却期の熱対流に関する一考察(河川・湖沼・沿岸域の環境流体(2),一般講演)

概要

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This paper describes the fundamental characteristics of vertical heat transfer due to thermal convection during the cooling period from 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 some calculated results by 1-D model to observed ones to understand the fundamental features of heat and mass transfer occurring in the Lake through a year. Through the examination of these results, it is pointed out that the thermal convection is the main mechanism of DO transfer at the bottom of lake. Then the detailed mixing mechanism caused by thermal convection during the cooling period is investigated numerically using 3-D CFD method. It is shown that thermal convection cells with the spatial scale of a few hundred meters are observed in the 3-D computational domain, changing the positions of submerging portion temporally and generating the mixing near the interface between the stratified two layers.
日本流体力学会の論文
2006-09-05