国内既往最大規模の竜巻を対象とした発生頻度の地域性について
A study on the regionalization of tornadogenesis for the domestic largest scale of tornado
著者:
杉本 聡一郎 Soichiro SUGIMOTO 野原 大輔 Daisuke NOHARA 平口 博丸 Hiromaru HIRAKUCHI
発刊日:
公開日:
Maximum wind speedMesoscale analysisRegionalizationSynoptic scale analysisTornado
概要
Abstract: A new regulatory guide has been issued by the Nuclear Regulation Authority of Japan since the last year. According to this guide, electric power companies have to assess the influence of tornadoes on their nuclear power plants for operation. The purpose of this study is to evaluate the likelihood of the occurrence of F3 tornadoes, which are the largest encountered in Japan, and to consider the possibility of the regionalization of the maximum wind speed. Then, mesoscale analysis with a numerical meteorological model and re-analysis data is performed along with synoptic scale analysis. Especially, tornado parameters such as SReH (Storm Relative Helicity) and CAPE (Convective Available Potential Energy) are used for evaluating the potential tornadogenesis of F3 tornado. Both analyses indicate that favorable meteorological condition tends to occur in the coastal zones in the Pacific side west of Ibaraki and around Kyushu island. The frequency in these zones is different from the one in the other area in the order of 1 or 2, which is large enough for regionalization.
