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For predicting discharge hydrograph and progress of inundation flow caused by the levee breach, it is important to evaluate inundation discharge precisely. In this study, utilizing that the change in hydraulic and geometrical conditions during the flood appear in the temporal changes in water surface profiles, we developed a calculation model to estimate inundation discharge hydrograph using unsteady two-dimensional flow equations and the temporal change in water surface profiles including effects of the levee breach. To validate the model, we carried out field experiments of levee breach of a channel constructed in the Joganji River. Compared with the experimental results, the simulated inundation discharges showed acceptable accuracy. Finally, several issues were raised during appllying this method to actual rivers.

CALCULATION METHOD OF INUNDATION DISCHARGE HYDROGRAPH FROM THE TEMPORAL CHANGES IN WATER SURFACE PROFILES DUE TO RIVER LEVEE BREACH