行政院國家科學委員會補助專題研究計畫成果報告:防洪示範區淹水境況模擬與決策支援系統之研究(二)─台南科學園區排洪能力及洪災防治措施之研究(二)
Date Issued
2002
Date
2002
Author(s)
許銘熙
DOI
902625Z002007
Abstract
This project is the subproject-2, A Study on Drainage Ability and Flood-Damage Mitigation Measures for Tainan Science-Based Industrial Park, of the second-year of the three-year integrated project, Inundation Scenario Simulation and Decision Support System for Flood-Damage Mitigation in Pilot Areas (II). The main purpose of this study is to investigate surface inundation with the consideration of water surcharges from drainage systems. Moreover, detention pond model is taken into account to analyze the flooding areas for various return periods of flood.
Based on hydrologic and topographic conditions and hydraulic characteristics of storm systems, an inundation model will be developed and applied in the Tainan Science-Based Industrial Park. The inundation model, which combines two-dimensional overland model, detention pond simulation model and storm sewer systems model, is developed to simulate the surcharge-induced inundation in the Park. Storm Water Management Model (SWMM) is employed to solve the storm sewer flow component and to provide the surcharged flow hydrographs for surface runoff exceeding the capacity of the storm sewers. The 2-D diffusive overland-flow model considering the non-inertia equation with alternative direction explicit numerical scheme is then used to calculate the inundation zones and depths due to the surcharged water on overland surface. Detention pond model considers outlet work with rectangular orifices and weirs used for solving hydraulic equations to provide the outflow hydrographs of the detention ponds.
In the first year, the drainage and inundation models were developed based on the hydraulic characteristics of the sewerage system in the study area. The 25-, 50- and 100-year return period designed storm and topographical characteristics of the Tainan Science-Based Industrial Park were employed to simulate the inundated extent of the study area. In the second year, the inundation model for the Tainan Science-Based Industrial Park is verified by the Typhoon Nan event in Central Taipei area in 2001. Different flooding scenarios are simulated for the Tainan Science-Based Industrial Park with different obstruction ratios of the sewer drainage systems. The simulated results can be used to examine the flood draining ability of current drainage systems and flood mitigation measures in the third year, and provide guide lines for the development of flood mitigation measures.
Subjects
Storm sewer system
Overland flow
Detention pond
Geographic Information System
Inundation model
Publisher
臺北市：國立臺灣大學生物環境系統工程學系暨研究所
Type
report
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902625Z002007.pdf
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Format
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