碩士 / 國立交通大學 / 土木工程系所 / 103 / Danshui river is the largest river in northern Taiwan. The coupled actions of coastal sand drift and river sand input render the coastal variation and erosion situation more complicated. The purpose of this study is about the evolution of the river mouth and coastal landform which will change because of typhoon event. In this case, we will use the Danish Hydraulic Institute´s (DHI) model, named Mike-21, to simulate the effects of the wave, current and the tide which cause the sand transport. Aere typhoon occurred in 2004 was selected to simulate the morphologic changes before and after the Danjiang bridge construction to obtain a better understanding of the influence of Danjiang bridge .
From the results of the numerical modeling, the current speed in downstream channel and river mouth are faster after the construction of Danjiang bridge, Moreover, suspended load will diverse due to the existence of bridge piers. There is a maximum of 0.1 meter contraction scour depth near Danjiang bridge pier. The variation of coastal bed variation and erosion situation between north breakwater of Taipei harbor to the levee of Linkou thermal power plant is within a narrow range about 0.15 meter. It can be seen that wave is the dominant force for the morphologic in the nearshore.
| Identifer | oai:union.ndltd.org:TW/103NCTU5015081 |
| Date | January 2015 |
| Creators | Chen,Kuan-Han, 陳冠翰 |
| Contributors | Yeh,Keh-Chia, Chang,Hsien-Kuo, 葉克家, 張憲國 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 92 |
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