The strong winds are observed over Japan, although the distribution is varied because of the mountainous terrain. The topography effect resulting in the strong winds associated with tropical cyclones (TCs) is intimately linked to the TC tracks. The purpose of this study is to examine the distribution of surface winds associated with TCs over Japan, based on numerical experiments. Using ensemble experiments with several TC cases, we detected the distribution of surface winds associated with TC tracks and developed a disaster-prevention graph so called “Typhoon Nomogram” at each location in Japan. The Typhoon Nomogram is useful for understanding the variability in the distribution of surface winds over Japan which depend on TC tracks and is useful for reducing the wind disasters caused by TCs.
It is important for wind resistant design and wind environmental survey to consider the wind turbulence intensity. Therefore, it is necessary to study relation between turbulence intensity, gust factor, and peak factor. Also, it is useful to propose their relational expressions which evaluate unknown values from a known value. For this reason, the present paper provides the relation between peak factor and turbulence intensity by using a lot of observation data at various locations, and proposes an empirical formula for this relation.