Author(s): Tsung-Yi Pan; Lung-Yao Chang; Shiang-Kuan Chang; Jihn-Sung Lai; Cheng-Shang Lee
Linked Author(s):
Keywords: Inundation map; Early warning; Climate characteristics; Emergency management
Abstract: Forecasting rainfall-inundation process is always a difficult task in Taiwan due to the flash flood induced by the rugged topography of the watersheds. Most inundation disaster was caused by heavy rain associated with typhoons that affect Taiwan 3~4 times every year. Therefore, early inundation warning is a critical issue of flood prevention for emergency managements. This study applies the climatology characteristics to downscale the 24-hr cumulative rainfall forecasting to spatial and temporal hourly rainfall as the input data for inundation modeling. Based on the hourly typhoon rainfall forecasting, the inundation model solving shallow water equations calculates the inundation depth and extent in study areas. The inundation map generated by the inundation model using observed rainfall data is regarded as real inundation scenario to evaluate the early warning method developed in this study. Two inundation events caused by typhoons in 2004 and 2005 are selected as case studies herein. The simulated results show that the inundation model linking climatology characteristic method predicts 24-hour-ahead inundation depth which provides important information for flood emergency management.
Year: 2010