SURGE-WAVE-TIDE PREDICTION MODEL INCLUDING TRANSIENT WAVE RUNUP, OVERTOPPING AND OVERFLOW MODELLING

Abstract

 This study developed the coupled model of Surge-WAve-Tide (SuWAT) by integrating a model of Transient Wave Runup, Overtopping and Overflow (IFORM) to improve the accuracy of inundation due to extreme surge heights. IFORM was incorporated into SuWAT in which overflow due to wave overtopping occurs before a sea level exceeds the freeboard; such phenomena were not modeled in conventional storm surge models. In estimating overtopping, the imaginary slope of foreshore and seawall can be fixed as 1:2 slope since an actual calculation to get imaginary slope is not changed so much as a model condition if wave characteristics at the toe of structures are employed. Results show that SuWAT-IFORM is able to well simulate a flooding event induced by a set of transient wave runup, overtopping and overflow.