The computation of maximum wind speeds of typhoon

At present, it is still difficult to obtain an accurate maximum wind speed of typhoon with modern means,such as satellite survey, radar tracing and airplane reconnaissance.The performance of statistical equation established with observational maximum wind speed and the central pressure of typhoon is unstable,and it is unreliable in operational use.Therefore a general pressure field model of typhoon is introduced in this paper based on atmospheric motion equations and formulas are derived for computing the maximum wind speed around typhoon center over sea surface.The theoretical curves derived from these formulas are in good agreement with those using the statistic empirical curves of typhoon pressure-wind relations over the western Pacific.Tests were conducted for typhoons which occurred in 1973 and in 1983 and the strongest typhoons selected each year during 1970 and 1978,the results were satisfactory.Meanwhile the analyses of computing results showed that the effect of Coriolis force could be negligible and the eccentric-elliptical pressure structure of typhoon could be treated as circular symmetric.