Flood Risk Analysis for Taipei City
Date Issued
2012
Date
2012
Author(s)
Lin, Yi-Chieh
Abstract
Taiwan is on the typhoon path of the East Pacific Ocean Region. Typhoons often bring heavy rainfall in July and August, and cause severe flooding that result in serious losses of life and property. The population and the development of socio economic in urban areas have been grown rapidly in recent years. Along with the increasing extreme rainfall events in Taiwan, the impact of flooding is raising. In addition to apply the structaral methods to reduce the flooding disaster, the concept of risk management is also an important issue for now. The Social Vulnerability Index was developed in the study to determine the flood risk by combining the hazard information.
This paper presents the process of constructing a flood risk map in Central Taipei Area (CTA), including ten districts of Shilin, Datong, Zhongshan, Songshan, Wanhua, Zhongzheng, Da’an, Xinyi, Nangang and Wenshan, and applies the FDM (Fuzzy Delphi Method) and AHP (Analytic Hierarchy Process) to select the social vulnerability indices (SVI) and set up the weights of these indices. The SVI is calculated at the district level, which has an area of about 10 km2. For the hazard part, the flood potential information was simulated by a hydraulic model using a regular grid with 40m resolution, and simulates the return period 5-year, 10-year, 20-year, 50-year, 100-year and 200-year for 6 cases. The district level was too coarse to represent the spatial distribution of inundation such that the flood hazard was integrated into village level that has an area about 0.2 km2. The SVI was combined with the flood potential information to determine the flood risk indices for each village.
By considering the temporal variation of demographical data, the study further demonstrated that change of social vulnerability indices and the risk. The analyzing results can help the city government to realize the most vulnerable area within the CTA. Hence, the resources for flood damage reduction can be allocated to reduce the risk of community of Taipei City.
Subjects
Vulnerability
Social Vulnerability Indices
Fuzzy Delphi Method
Analytic hierarchy process
Risk map
SDGs
Type
thesis
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