| Summary: | 碩士 === 國立臺灣大學 === 地理環境資源學研究所 === 102 === Urbanization and climate change have caused many problems and one of the serious problems is flooding in urban area. Urbanization can lead to hydrologic condition change such as stream peak flow will increase and time of concentration will decrease etc. Many researches also point out that using engineer methods alone to deal with flood problems could not solve the problem in urban area. From integrated watershed management point of view, non engineer methods (water retention facilities) and engineer methods are innovative methods to reduce urban surface run off , it can also create a healthier ecology city. This paper will take Fazih River Basin as an example which is in the fastest urbanization rate in Taiwan. We use 2D inundation model and geographic information system to simulate how land use transformation can affect flood condition. The analysis consequence reveals that non engineering methods make significant effect on flood control, but havy precipitation will limit its retention capacity. The result of analysis shows that under the heavy rainfall event, water retention methods can not decrease flood area effectively. However, it can delay time of concentration and decrease initial flood discharge. Under the ordinary rainfall event, water retention facilities can not only reduce flood area but decrease flood discharge and delay time of concentration. When facing climate challenge, water retention methods maybe are one of good solutions. Promotion of water retention methods will form an ecology city in the future, so government should convey this concept to its citizen to generate a better city.
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