| 英文摘要
| Facing the challenges of climate change and high urbanization, the water environment risks faced by modern cities are becoming more and more serious. The traditional concept of stormwater management is hard to cope with the threat of future urban changes. in this regard, the concept of stormwater management has gradually turned into a sponge city strategy that resiliently adapts to environmental changes and floods. The core concept is low-impact development (LID), which increases the infiltration of catchment area or water storage space and reduces surface runoff through distributed source-processing design, alleviating the impact of urban development on the hydrological cycle. This study combines urban planning and the LID design concept to explore the impact of regional permeable and detention capacity on urban resilience. The study area is based on the high-density development of the Yonghe district of New Taipei City. The US Environmental Protection Agency (US EPA) storm water management model (SWMM) is used to select suitable LID facilities or detention tanks based on the land use characteristics of the area. Rainfalls with different return periods and different delays were simulated. The results show that LID can be most effective in low return period and short-delay rainfall, and the use of detention tanks is more effective in rainfall above 25-year return period. In addition, in the case of limited space, rainwater should be used for collection; in the case of limited costs, green roofs should be used to maximize their effectiveness.
This study designates the A7 consolidation area in the specific area of Linkou as the research area and employs the storm water management model (SWMM) developed by the US Environmental Protection Agency (US EPA). Accordingly, the present study explores the efficacy of LID and subtractive peak flow and surface runoff of detention ponds by design reasonable LID facilities according to the urban planning of the area and simulating different rainfall conditions.The results show that LID can produce better results in rainfall of short-delay and return periods, and the results are not as significant as the detention when the return period is more than 10 years. From the perspective of unit cost, the green roof boasts the best peak flow reduction efficiency. While from the perspective of unit area, the stormwater collection system produces the best result. For the LID design of the entire metropolitan area, the best configuration needs to be considered to maximize cost-benefits. This study discusses the optimal peak flow reduction and subtractive runoff efficacy of LID and its spatial configuration in different costs by virtue of multi-objective genetic algorithm (MOGA). The results show that in order to reduce the subtractive peak flow, LID should be preferentially configurated in the upstream and downstream of the drainage trunk. To reduce surface runoff, highly cost-effective LID facility should be employed regardless of the drainage system. In general, 80% configurable area of LID serves to achieve 100% effect. Finally, the urban morphology has been randomly changed by virtue of the Monte Carlo test. The results show that in order to reduce the peak flow, a higher proportion of LID can be configurated in areas with higher water impermeability, and the reduction of surface runoff is impertinent to the impervious rate. Therefore, surface runoff is a more appropriate LID indicators of urban design. |
