台風0423号通過時における佐賀県小城市周辺風況のCFD解析

概要

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Although Typhoon Tokage(0423) didn't directly hit the Island of Kyushu, the damage to buildings and structures that it caused was concentrated in Ogi city in Saga Prefecture in Japan. This area is more than 300 km away from the typhoon's path. The northeastern winds associated with the typhoon may also have become much stronger under the influence of a mountainous terrain located in the north of the city. In this paper we focus on the outbreak of strong winds in Ogi city and examine the outbreak condition of such hazardous winds using a computational simulation. We found that when the northeastern winds blow in, they converge in the shallow valley of the southward-facing slope of the mountains and become stronger. When the atmospheric state is stabilized, strong winds tend to flow along the mountain surface and so they are affected more strongly by terrain in a narrow area around Ogi City.
九州大学の論文