Evaluation and Application Study on Urban-Area Inundation Models(I)
|關鍵字:||地表逕流;淹水潛勢分析;淹水模式;Surface Runoff;Potential Inundation Tendency Analysis;Inundation Model|
The study of flood resulted from typhoons and storms at urbanized area is taken seriously accompanied by the rapid growth of socioeconomic development in Taiwan. Some of the examples include: the management and operation of storm water gates, the installation of detention pound, the planning of flood diversion way, and the combination of urban planning development and storm sewer design. The management of urban storm water and the pump stations is therefore brought to great attention, for example: the paralyzed MRT system in Taipei by the flood resulted from the Nari Typhoon in 2001; the heavy damages on the cities and towns by the Mindulle Typhoon in 2004, and the inadequate drainage of floods at parts of Taipei by the Haitang Typhoon in 2005. Therefore, the discharge of flood has crucial effects on the protection of the lives and properties of citizens. The locations and area of inundation are affected by the function of drainage facilities, which bears the flow from the runoffs resulted from the rainfall. This runoff flow through the streets and the inlets of the trenches leading to the storm sewer before being transported to the water gates or the pump stations in order to be drained to the rivers, lakes, or coastal areas nearby. Therefore the phenomenon of inundation could be simulated by integrating the inundation model, street network surface flow model, the storm sewer network model, and the operation model of the water gates and pump stations. The purpose of this study is to review six urban inundation model theories and numerical models to evaluate the advantages, disadvantages and limitations of the existing domestic and foreign modern inundation models in order to choose and apply to the local cases in Taiwan. In the meantime, the sub-plan researches such as the rain fall distribution, flood control and drainage facilities, and the urban sewer are combined for the analysis of the urban potential inundation trend of the applied target (the Yu Cheng Pump Station in Taipei). Related suggestions and measures would be made in order to achieve the goal of improving the inundation control in urban settings. This plan would be divided into a three-year study. The first year would be the review and evaluation of existing inundation model theories and their computations with emphasis on the research of the boundary conditions needed for the simulations plus the analysis of the sensitivity of the model variables. Entering into the second year, there would be an actual application of the model on the target of interest where the results from different models would be compared and evaluated. Counter-measures and suggestions would be made in the third year, after attaining the results from the potential inundation tendency analysis.
|Appears in Collections:||Research Plans|
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