Abstract
AbstractIn this study, the physiographic inundation model that comprehensively accounts for the physical process of overland flow due to heavy rainfall and typhoon‐induced storm surge was applied to describe potential inundation in a coastal zone. A comparative study was first conducted to validate the model; the simulated results excellently agree with the field measurement concerning inundated depth and area during Typhoons Haitang and Kalmaegi. The model was then applied to calculate the corresponding potential inundation, inundated area, and inundated risk in a flood‐prone coastal zone under design rainfall of seven return periods (2‐year, 5‐year, 10‐year, 20‐year, 50‐year, 100‐year, and 200‐year) and the given hydrograph of storm surge. The simulated result indicates that 7.59% of the study area is under flooding when the return period is 2‐year and the ratio increases to 10.16% when the return period is 200‐year. Moreover, the ratio of the inundated area where the inundated depth is greater than 1 m to the total inundated area increases with an increase in the return period. It can be also found that more severe inundation arises in the lagoon and estuary together with both sides of tidal reach of rivers which also have higher inundated depth and risk.
Published Version
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