NUMERICAL SIMULATION OF INUNDATION PROCESS IN LOWLAND AREAS OF EAST TOKYO CAUSED BY THE OVERFLOW FROM THE ARA RIVER

Abstract

Inundation process in lowland areas of east Tokyo which is bordered by the Ara River and the Sumida River was investigated under the assumption that the overflow from the Ara River into this area occurred. Numerical simulation model was constructed by extending our previous computational model to evaluate the flows in vacant lands as well as on the road-networks in this area. The overflow point and its discharge were the assumed one in this stage. As a result of this simulation, the time series of information about the flow path of inundated water were obtained, and the characteristics of inundation in this area were made clear. This kind of information must be useful when we make a plan of evacuation route if we experience such serious inundation.