陸棚沿岸域における台風高潮について

Abstract

This work concerns to a part of study on typhoon-induced storm surge as one of the important factors at considering the coastal hazards and related protection works. Main interest is concentrated to the problem on a nonlinear effect in the shallow waters of the coastal and shelf zones at passage of a typhoon. In order to find dynamical mechanism of the nonlinear effect, a simple theoretical model is introduced first. The result suggests that there are various possible patterns of the sea level variations as the nonlinear effect, even after eliminating the predicted astronomical tides and the reversed barometric effect. As an example of the recent storm surges, a case of the typhoon 9119 is introduced with a notice about the observed variations in relation to the patterns of the theoretical model. With the dynamical understanding of the storm surge, a more advanced prediction and protection works could be expected in practice referring to the observations and numerical simulations.