Evaluation of Strategy for Flooding Reduction in Urban Areas－A Case Study of Wayaogou in New Taipei City
Date Issued
2014
Date
2014
Author(s)
Wang, Wei
Abstract
In recent years, extreme rainfall events become more frequent due to global climate anomaly. The flood disasters are more serious especially in metropolitan because of its high population density and excessive development. Therefore, it leads to the increment of the flood risk. This research takes Wayaogou Drainage located in New Taipei City as the study area which is highly developed and selects four adjustment strategies based on the characteristics of urban areas to analyze flood mitigation. This study evaluates the mitigation performance of these four strategies separately by using the simulated results obtained from flood inundation modeling. The flood inundation model is verified by the flood event occurred on August 12, 2009 to check the numerical accuracy.
The above selected adjustment strategies are building retention, green roof, permeable pavement and ecological detention pond, respectively. Two different rainfalls (5-year and 10-year return periods) are input into the flood inundation model to analyze the benefits and limitations of these four strategies. The simulated results show that the flood area reduced after applying the adjustment strategies. Among the four strategies, building retention can decrease the most flood area. Regarding the aspect of adaptation benefits (e.g. the ratio of reduction of flood areas to adaptation areas), the strategy of the ecological detention pond is more efficient than others. It can obviously reduce flood areas in its surrounding region.
For 10-year return period rainfall, the peak discharge in channels will approach to the safety value and be prevented from overbanking by applying the selected strategies, except for ecological detention pond. Eventually, the contribution of the four strategies is presented in flood risk map. Through conducting these adjustment strategies, they all descend the flood risk and then ascend the flood resilience in Wayaogou drainage.
Subjects
淹水模擬
都會區淹水
調適策略
耐受度
風險度
Type
thesis
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