NUMERICAL STUDY ON WAVE OVERTOPPING AND OVERFLOW THROUGH SEAWALL LINE IN STORM SURGE

Abstract

 Overflow of the seawall can be caused by sea level rise and enforced typhoon because of global warming. However, the method to evaluate the innundation risk simultaneously considering overtopping and overflow hasn’t been established. In this study numerical experiments by CFD toolbox OpenFOAM were conducted to analyze the condition where overtopping and overflow cause at the same time. At first, the validity of the existing model to calculate flow rate of overtopping and overflow has been checked. Next, the simulation suggested that innundation level on land can rise higher than the sea level because of storm surge and waves. Finally the simple formula to estimate the inundation level on land was proposed by considering radiation stress in the sea area.