碩士 / 國立臺灣海洋大學 / 河海工程學系 / 102 / Taiwan is frequently struck by typhoons and is severely influenced by the resulting disasters that occur, especially in coastal areas. The overdevelopment and improper use of coastal areas may cause severe coastal erosion and even endanger the lives and property of citizens. In recent years, the concept of coastal buffer zones (CBZs) that can prevent and reduce coastal disasters has attracted increased attention. The definition and planning of CBZ boundaries are vital topics in coastal management and restoration.
We explored CBZ boundaries from a hydrodynamic perspective and analyzed water movement and sediment transport in actual typhoon cases. The research area was Yanliao Beach in the Northeast and Yilan Coast National Scenic Area. The CBZ comprises land and ocean boundaries. Regarding the CBZ land boundary, wave run-up empirical formulae and the coastal modeling system (SMC) Petra cross-section module simulation were used to calculate the extent of water movement, coastal erosion, and scouring positions before conducting comparisons with the actual cross-section affected by typhoons and a suitability assessment based on a t test. The CBZ ocean boundary was calculated using the empirical formulae for critical depth of sediment movement, the SMC Petra cross-section module, and Mopla planar module. We calculated the ocean sediment transport range and determined the optimal calculation method by analyzing the calculation results and performing characteristic analysis. The case analysis results indicated that the CBZ land boundary calculated using the empirical wave run-up empirical formula developed by Mase (1989), which considers the surge tide and wave setup factors, and the SMC Petra cross-section module was consistent with the actual coastal cross-section variations that occurred during typhoons. The CBZ ocean boundary calculated using the SMC Mopla planar module, which considers wave and nearshore current factors, was superior. Moreover, calculation results based on the typhoon wave conditions over a 50-year recurrence interval, which were used to determine the CBZ boundary ranges, indicated that the CBZ land boundary of the Yanliao Beach should be marked at the +5 m contour line and the ocean boundary should be marked at the -40 m contour line.
| Identifer | oai:union.ndltd.org:TW/102NTOU5192052 |
| Date | January 2014 |
| Creators | Lee, Yu-Hsun, 李侑勳 |
| Contributors | Hsiao, Sung-Shan, Lan, Yuan-Jyh, 蕭松山, 藍元志 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 131 |
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