碩士 / 弘光科技大學 / 環境工程研究所 / 102 / The objective of this thesis was the exploration and characteristic analysis of the topographical evolvement mechanism around the Kaomei Wetland, taking into account the effects of tidal fluctuation, waves and water currents and to conduct a topographical erosion study. The Danish DHI hydrodynamic model has been used to analyze and explore the topographical fluctuations and characteristics and the impact of external forces. The MIKE21 (the wave, hydrodynamic and topographical evolvements) was used to model and calculate changes in the sea areas near Kaomei that take place under the influence of tidal forces.
The topographical history and related data has been analyzed, utilizing the MIKE21 ST model to simulate a sand-shifting model to investigate the nearby tidal currents that cause silting at the northern breakwater, northern sand groin and head of the old US Kaomei military pipeline sea embankment, under the force of seasonal incident, where erosion occurs on the outer circumference. In the summer season, the waves do not have much impact to the north of the northern breakwater, but the tidal current force causes erosion to the north of Taichung Port. In winter the waves have insignificant impact to the south of the northern breakwater and Taichung Port. However, the extent of silting north of the northern breakwater is expanding steadily and also extending to the sea at the outer edge of the Kaomei Wetlands. Historical field surveys of topographical erosion, and silting characteristic analysis, has shown that silting has been steadily extending to the south and north behind the northern breakwater over some years. In 2002 the annual erosion trend was C1: 0.4730 m/year, and C2: 9423 m/year. The overall B1 area to the left of the northern breakwater shows stable silting, but this has been gradually saturating since 2003 and the speed of erosion has slowed down by 0.05 m/year. The C1 and C3 areas on the Kaomei Wetland outer beach has shown a silting state after 2002, where the erosion trend is 0.322 m/year.
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| Identifer | oai:union.ndltd.org:TW/102HKU05515007 |
| Creators | Meng-Sian Jhuo, 卓孟賢 |
| Contributors | Chih-Chung Wen, 溫志中 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 102 |
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