The Flood Risk Assessment of Green Roofs and Surface Retention for Climate Change
Date Issued
2014
Date
2014
Author(s)
Hsu, Ling-Chen
Abstract
Population growth and urban development, especially the land use change, put pressure on urban drainage water infrastructure. As a result, the severe flooding events happened in the recent years. The traditional structural measures, like increasing storm sewer systems, river dredging, and dike construction are difficult to reconstruct in the existed urban area, especially in Taipei city. Urban floods endanger the people of casualties and causing serious property losses.Therefore, the other flood measure using adaptation strategies of risk assessment in urban area is a significant problem to be study.In this way, a series of alternative plans were studied and compared by the flood risk assessment to get suitable prevention and adaptation in order to reduce the impact of disasters.
Hazard and vulnerability are two major factors affecting the risk analysis. The inundation depth in urban area is calculated under the consideration of adaptation strategy and climate change for hazard assessment. The adaptation for hazard is green roofs and detention ponds installation in the study. The adaptation is to reduce the peak discharge and delay time occurring storm water runoff. The hydraulic experiments of the water storage of green roofs with varies soil types are conducted. The numerical inundation model is employed to calculate water depth in cases of the adaptation and climate change. The risk map which is drawn by risk matrix from the hazard potential and social vulnerability is used to show the effect of the adaptation and mitigation for the global change.
The center Taipei city is chosen as the study area. The vulnerability under present conditions and the estimation of the social vulnerability in 2039 are carried out in this study. The A1B scenario of rainfall for climate change by Intergovernmental Panel Change is simulated. The Storm Water Management Model and the Two-dimensional Inundation Model are employed to calculate the flooding situation. The return period of 10, 25, 100 and 200-year hazard maps and risk maps are investigated for the center Taipei city.
Subjects
氣候變遷
綠屋頂
滯留措施
危險度
脆弱度
風險評估
Type
thesis
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