B231 火山の噴煙上昇における潜熱加熱の効果 : 三宅島 2000 年噴火(数値実験)

概要

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Numerical experiments are performed to examine the effects of water vapor condensation on the maximum height of the smoke column at the Miyakejima volcano. The result clearly shows the importance of the latent heat of condensation to show the realistic eruption colomn. For example, in the simulation the eruption on 10 August, the smoke rises up to 8000m with the water condensation, whereas it rises only to 3500m without the water vapor. The evaporation of rain water drives a downdraft, which brings some of smoke material down to the ground surface. This may have an implication to the observed weak surges. The experiments with the atmospheric structure of various seasons show that the smoke height considerably varies with seasons (higher in summer and lower in winter), even without the activity of volcano.
日本流体力学会の論文
2002-07-23