日本海冬季沿岸地域における竜巻状渦の発生機構と突風の高解像度モデル解析(渦・回転+大気(4),一般講演)

概要

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The present study investigates the development and evolution of microscale vortices embedded in convective bands by conducting high-resolution simulations with the Weather Research and Forecasting (WRF) model. A case on 2 December 2007 over the Shonai Plains is chosen for the present analysis. The control simulation well represents well-defined multiple vortices embedded at the leading edge of a weak cold-air outflow in a precipitating cloud band, where horizontal wind shear is significant. Since the environmental low-level atmosphere is very unstable owing to cold air over the warm sea surface temperature, the strength of convective clouds becomes very significant enough to enhance the vortices. A sensitivity simulation is also performed in order to examine the role of the low-level instability in intensifying the vortices. The present simulation captures observed high wind speeds and their local scales due to the strong tornado-like vortices.
日本流体力学会の論文
2009-09-02