Flood Risk Assessment in Urban Areas of Southern Taiwan

A flood risk assessment of urban areas in Kaohsiung city along the Dianbao River was performed based on hazards and social vulnerability. In terms hazard analysis, a rainfall-runoff model (HEC-HMS) adopted to simulate discharges watershed, simulated were utilized as inputs for inundation (FLO-2D). Comparisons between observed at Wulilin Bridge flow station during Typhoon Kongrey (2013) Megi (2016) used HEC-HMS calibration validation, respectively. The water levels Changrun FLO-2D results indicated that reasonably reproduced observations. validated then applied predict depths extents under 50-, 100-, 200-year rainfall return periods form maps. For vulnerability, fuzzy Delphi method analytic hierarchy process employed select main factors affecting vulnerability yield weight each factor. Subsequently, map built. developed compiled both levels. Based map, mitigation strategies with structural nonstructural measures proposed consideration by decision-makers.