The risk of wave overtopping and overflowing is increasing in the water-front of several countries because of the rise of mean sea level by global warming and the rise of the storm surge due to the typhoon or hurricane scale increasing. In the paper a tree dimensional fluid analysis model for wave overtopping and inundation is introduced. A numerical prediction of inundation risk in a coastal area is carried out applying the model and its applicability is demonstrated.
Sea level change due to global warning now becomes an urgent problem to coastal areas. In the Japanese urban areas facing to the oceans, the rise of storm surge deviation and wave heights are also risky to the human lives and properties as well as the rise of mean sea level. The inundation risk management like implementation of tidal barriers or warning system risk should be established especially in the residential and office areas located in the backyards of sea walls. As countermeasure against inundation due to wave overtopping and overflows the construction of high tidal barrier or sea wall has been carried out so far. But such construction of large walls may cause the disadvantages in landscape and need a large cost. Other simple facilities and development of soft ware to mitigate the risk of inundation is in great importance to protect the risky coastal areas in relatively short time. At the first the paper describes the characteristics of inundation due to wave overtopping and storm surges in a model area facing to the Tokyo Bay, Japan employing a numerical simulation method. The MARS (Multi-Advection Reconstruction Solvers) is employed to simulate the wave overtopping. The validity and applicability of the model was obtained by Hiraishi et al.(2006).