Abstract
The maximum wind radius (Rmax) of typhoon is one of the predominant parameters for the estimation of storm surges. The present paper reviewed the existing methods that estimate Rmax by either central pressure or maximum wind speed and concluded that all of which would substantially over or underestimate storm surges. It was found that the radius of 50-kt wind (R50) can be alternatively used for the Rmax estimation (Rmax = 0.23R50). It was also suggested that the variability of Rmax should be taken into account in the storm surge simulation in order to minimize estimation errors, considering a couple of different radii. The proposed Rmax estimation model using R50 is expected to increase reliability of storm surge prediction to a large extent and would contribute to the disaster risk management particularly in those countries located near Japanese southern ocean basin, such as Japan, China, Taiwan, and the Philippines.
