Analysis and Synthesis of Typhoon Wind Pattern over Japan

The present status of the studies on analysis and synthesis of surface wind pattern of severe typhoons over the main islands of Japan made by the group of the present authors by the aid of Grant-in-Aid of Research on Natural Disasters is reviewed in the present paper. Forty nine severe typhoons in the period from 1951 to 1984 were analyzed and a statistical character of sever typhoons hitting the Japanese archipelago was obtained. Numerical simulation of a typhoon with the pressure pattern statistically consistent with the result was attempted to estimate severe wind conditions of a point. At the same time simpler method to construct the probable severe wind patterns caused by a typhoon model was also proposed. Some problems in translation of the gradient wind speed into the surface wind speed were also discussed