台風シミュレーション・システムの開発と風向別最大風速の評価

Abstract

The basic wind speed for a long-span bridge was examined using GIS-based typhoon simulation system. First, the recorded typhoons which generated strong wind at the proposed bridge site were extracted from the typhoon data by the Japan Meteorological Agency, and probabilistic models expressing the characteristics of the typhoons were created. Next, the surface wind speed and direction were calculated using the Meng's formula, and they were examined by comparing with wind observation records at the site. Based on these results, the probability distributions of the annual maximum wind speed for every 16-divided wind direction were computed by the Monte-Carlo method. Various analyses were efficiently performed making the best use of the functions of GIS.