Evaluation of the Impact of Climate Change on Storm Sewer System in Taipei City
Date Issued
2009
Date
2009
Author(s)
Wang, Hsuan-He
Abstract
Taipei city is well protected by complete storm sewer systems. Recently, global warning has caused climate change, then higher extreme rainfalls and more inundation disasters are expected in the future. As necessary, simulations of storm sewer system and predictions of impact of climate change shall be conducive to improvement of storm sewer systems.n the present study, simulation area is set to be Guting and Songshan storm sewer systems, located in Taipei central area. Hydrologic data, geographic data, and sewer system data are collected for numerical simulation. Tools for numerical simulation are the storm water management model (SWMM) and 2-Dimensional overland flow model. GCMs can produce 24-hour duration precipitation with climate change, but it will have problems of time-scale downscaling when 90-minute duration precipitation with climate change is needed. In order to solve this problem, Horner formula is used to build the relationship between 24-hour duration precipitation and 90-minute duration precipitation, after that Horner formula for climate change situation is estimated, then 90-minute duration precipitation with climate change can be calculated.t is observed that the effect of increasing precipitation on total overflow volume and inundation area is significant. In addition to tolerance analysis, we can find three different phases of tolerance. It shows that the system tolerance would also change with precipitation amount. Because of taking conservative decision, A2 scenario in HADCM3 model is selected to perform climate change analysis. Impact of climate change in 2010 to 2039, 2040 to 2069, and 2070 to 2099 are all calculated and listed. Simulation results show that impact of climate change on storm sewer system is significant on total overflow volume and inundation area.
Subjects
storm sewer system
climate change
downscaling
tolerance analysis
Type
thesis
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