COMPOUND FLOODING OF WAVE OVERTOPPING AND STORM SURGE USING A FULLY COUPLED SURGE, WAVE AND TIDE MODEL

Typhoons accompanied by storm surges, high waves, and heavy rainfall cause severe compound flooding in coastal areas. Various flood factors in compound coastal flooding interact dynamically. As a result, flood damage in coastal areas is exacerbated. For example, Kansai Airport experienced heavy flooding due to Typhoon Jebi (2018). During this event, multiple flood factors included wave overtopping, rainfall, seawater reverse flow through sewer systems, and partial seawall collapse caused by wave overtopping. As in previous studies, estimating flooding caused by individual factors has limitations in accurately analyzing the complex physical processes and interactions between the factors, such as compound flooding events at Kansai Airport. This study conducted a series of numerical experiments at Kansai Airport to propose a method for estimating compound flooding in coastal areas.