| Summary: | 碩士 === 國立臺北科技大學 === 土木與防災研究所 === 97 === The Tanhsui river have three main tributaries, includes Tahan river, Hsintien river and Keelung river, the river flows through Kuantu and flows into the Taiwan straits from Tanhsui, the Tanhsui river is the first largest rivers in the north of Taiwan, the length of river is 159 km and drainage area is 2,726 km². Three main tributaries gather flow rate in the basin of Taipei within the range of 10 km, only one outfall in Kuantu can release floodwater. In this study uses the latest(A.D. 2005) data of watershed of Tanhsui river, the data including topography, hydrology and flow, and using SMS to simulate, then uses the same data of the topography section, and different silt range and silt height, uses the same models to simulate too. We can get the result and find difference between them. We are known by the result, the same topographical condition but different river section profundity, the discharge capacity to Er-Chung floodway will cause influence too, the result hopes to be consulted by scholar and hydraulic expert, when they assess the dredge questions of Tanhsui river and efficiency question of floodway.
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