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 flood hazards and social vulnerability. In terms of hazard analysis, a rainfall-runoff model (HEC-HMS) was adopted to simulate discharges in the watershed, and the simulated discharges were utiliz...

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Bibliographic Details
Published in:Sustainability 2021-03, Vol.13 (6), p.3180
Main Authors: Liu, Wen-Cheng, Hsieh, Tien-Hsiang, Liu, Hong-Ming
Format: Article
Language:English
Subjects:
Analytic hierarchy process
Calibration
Data collection
Delphi method
Disasters
Drainage
Environmental risk
Flood hazards
Flood mapping
Flooding
Floods
Hazard mitigation
Hydrologic models
Hydrology
Mitigation
Rain
Rainfall-runoff relationships
Risk assessment
Rivers
Roads & highways
Simulation
Sustainability
Two dimensional models
Typhoons
Urban areas
Water level fluctuations
Water levels
Watersheds
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Summary:A flood risk assessment of urban areas in Kaohsiung city along the Dianbao River was performed based on flood hazards and social vulnerability. In terms of hazard analysis, a rainfall-runoff model (HEC-HMS) was adopted to simulate discharges in the watershed, and the simulated discharges were utilized as inputs for the inundation model (FLO-2D). Comparisons between the observed and simulated discharges at the Wulilin Bridge flow station during Typhoon Kongrey (2013) and Typhoon Megi (2016) were used for the HEC-HMS model calibration and validation, respectively. The observed water levels at the Changrun Bridge station during Typhoon Kongrey and Typhoon Megi were utilized for the FLO-2D model calibration and validation, respectively. The results indicated that the simulated discharges and water levels reasonably reproduced the observations. The validated model was then applied to predict the inundation depths and extents under 50-, 100-, and 200-year rainfall return periods to form hazard maps. For social vulnerability, the fuzzy Delphi method and the analytic hierarchy process were employed to select the main factors affecting social vulnerability and to yield the weight of each social vulnerability factor. Subsequently, a social vulnerability map was built. A risk map was developed that compiled both flood hazards and social vulnerability levels. Based on the risk map, flood mitigation strategies with structural and nonstructural measures were proposed for consideration by decision-makers.
ISSN:2071-1050
2071-1050
DOI:10.3390/su13063180