Simulations of Storm Runoff and Inundation in Watershed

• Main Authors: Chang-Rong Chen, 陳昌榮
• Other Authors: Ming-Hsi Hsu
• Format: Others
• Language: zh-TW
• Published: 2002
• Online Access: http://ndltd.ncl.edu.tw/handle/56944059831205283740

碩士 === 國立臺灣大學 === 生物環境系統工程學系暨研究所 === 90 === A two-dimensional overland model has been developed to simulate surface inundation. The surface inundation of the study area is investigated to provide the inundation information for the local residents and the authority concerns in order to prevent from the flood hazards in advance. The study areas are the Yen-Shui Creek Basin and Tainan Science-Based Industrial Park. The two-dimensional overland model was applied in Tainan Science-Based Industrial Park to simulate the sewer drainage and the surface inundation with considering the effects of the storm sewer systems and the detention pond during storm periods. In addition, the influence on the park of the surface runoff and the flux from drainage of the Yen-Shui Creek Basin was simulated. According to the water-level relations between Tainan Science-Based Industrial Park and Yen-Shui Creek Basin, the flux per unit width of the boundary is calculated to investigate the mutual influence of Yen-Shui Creek Basin and Tainan Science-Based Industrial Park for floods. Moreover, the flow discharged from the detention ponds located in Tainan Science-Based Industrial Park to Yen-Shui Creek Basin is taking into consideration in the simulation model so as to acquire the results more accurately. For the development of Tainan Science-Based Industrial Park, the elevation of the land surface in the park is higher than the Yen-Shui Creek Basin. Applying the free weir equation or the submerged weir equation that uses the water-level relations between the inner and outer boundary points, the mutual inflow and outflow flux can be calculated. The study results reveal that the effects of the flux from the boundaries of Tainan Science-Based Industrial Park are dominated, including the raise of both inundation depth and inundation area. The simulation results conform the practical situations.