| Summary: | 碩士 === 國立臺灣海洋大學 === 河海工程學系 === 95 === Due to excessive urban development and population growth, both impervious area and water demand in urban area increases dramatically. Consequently, less water is infiltrated into the ground and water conservation capability is worse. Therefore, water balance is urban are interrupted and more frequent flooding are increased. In order to restore the water balance in the urban area, the long-term water balance model to assess the environment impacts by installing rainwater harvest facilities rooftop rainwater harvesting and porous pavement is needed.
This research collects and analyzes the researches performed by domestic and foreign authors in the areas of urban water cycle modeling, hydrology model, evapotranspiration estimation and the strategies of water environment improvement. The lumped distribution concept, which divided land use into porous and impervious pasts was used, to establish the theoretical framework of "Urban Water Environment Decision System" using the language of Microsoft Visual Basic 6.0.
To evaluate the feasibility of this model, the watershed of Liu-guan pumping station of Datung district in Taipei city is selected for the study. Sensitivity analysis of parameters in the model, model calibration and verification are carried out using the established window-based model using data form years of 2005 and 2006. The simulation result show that the adaptability of "Urban Water Environment Decision System" is suitable for the long-term simulation and the roof rainwater catchment system decreases the water supply system demand, and obtain the benefit of flood mitigation. The porous pavement alternatives which include five different types can effectively improve the conservation ,infiltration , evapotranspiration, and runoff reduction in the urban area.
The model developed by this research is capable for assessing any impacts to urban water cycle due to land use change and provides as an useful tool for relative urban planners.
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