英文摘要
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In hydraulic engineering planning and flood early warning, hydrological and hydraulic models are often used for numerical simulation. Therefore, the hydrological and hydraulic models need sufficient and reliable field data for parameter calibration and verification to ensure that the simulation results can correctly reflect the on-site hydraulic phenomena. However, the drainage systems in Taiwan are often extremely complex and there are many hydraulic structures, which cannot be correctly displayed through the current customary suggested values of model parameters. In order to improve the accuracy of the simulation results of the numerical model, we first select a drainage basin with relatively simple geography characteristics and use the on-site hydrological observation data to discuss the localization of the parameter values of the hydrology and hydraulics model. In 2019, the Bagu drainage system was selected for long-term hydrological monitoring in this study. Two rainfall stations, 18 water level stations, and six water level and surface velocity stations were set up in the catchment area. So far, the observation data with rainfall and water level of many rainstorms and typhoons over the years has been obtained. In addition, the rainfall-runoff module and the one-dimensional channel flow module of the SOBEK hydrodynamic model are used to provide the basis for calibration and verification of model parameters through complete long-term observation data. And through the calibration and verification procedure, the optimization method is used to calculate and discuss the localized curve number of different land use types in the Bagu drainage catchment area.
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