STUDY ON FLOOD HAZARD IN RIVER RECREATION SITE DUE TO HEAVY RAINFALL

A mathematical model which can simulate inundation process in river recreation site due to heavy rainfall has been developed. This model comprises the runoff model by the kinematic wave method and the 2-D inundation flow model based on the generalized curvilinear coordinate system. This model was applied to Hiragino park area in the Kamo river basin, Kyoto city. It was found out that under the same rainfall condition that caused the flood disaster at Tanigawadake in August 2000, the park area can become very dangerous. Also, the flood hazard possibility is expressed by the rainfall intensity and the time taken for rise of water depth or river velocity.