Study on Rainfall-Runoff Analysis for Urban Area of Fa-Tzu River by Simple Tank Model and Their Application

• Main Authors: Yung-Nien Chan, 詹永年
• Other Authors: 陳榮松
• Format: Others
• Language: zh-TW
• Published: 2008
• Online Access: http://ndltd.ncl.edu.tw/handle/22485039141076897050

碩士 === 國立中興大學 === 土木工程學系所 === 96 === In recent years, with the development of the social economic activities and the growth of population, there is an increasing need for residential land. Under the situation of changed land-use and the phenomenon of climate warming in these years, the original hydrological phenomenon is also changed, so the runoff mechanism of the area must be influenced. Respecting this situation, this study utilized the modified simplified tank model to explore and simulate the outflow pattern of Fa-Tzu River in the urban area during the rainfall events, in order to understand how the heavy rainfall events influence the runoff in the urban area. In this study, Multi-Start Powell was used to be the calibration of the physical parameters of the model, in order to investigate the actual rainfall amount and the river flow data of the area. Meanwhile, this study categorized the hyetograph into heavy rain and sporadic rain. The model input and the calibration of the parameters are based on this categorization. After obtaining the best range of the parameters of each group, the rainfall-runoff was simulated and the simulation result was evaluated by 5 indexes—RMSE, CE, EQP, ETP and EV. It was found that the tank model was not only suitable for the paddy field, hillside and woodland which have better water retention, but also quite suitable for the urban area which has worse water retention. Besides, the peak flow of every heavy rainfall event and recession limb were in a good situation in the simulation.