| Summary: | 碩士 === 國立臺灣海洋大學 === 河海工程學系 === 97 === The major purpose of this research is to study the geomorphic change of Lin-Tou Park in Penghu County, to investigate the causes of shoreline changes, furthermore, to format its strategies and alternatives. This research adopts the numerical model with existing measured data to simulate the concepts of hydrodynamic and shoreline changes. The main reason of this method adoption and measure of shore protection is try to minimize impacts on ecological systems without safety sacrifices to decline the speed of shoreline changes. The results of this study are stated below:
The four principles of proposed measure of shore protection of Lin-Tou Park on this study including: (1) the shore protection with all its aspect; (2) the adoption of nature-working method or eco-engineering method; (3) water-accessible influence of shore protection facilities; and (4) overall area development plan of the park combined with the plan of land usage. The proposed strategies and alternatives adopted above mentioned principles for the shore protection are categorized into two: mechanical control-measure and non-mechanical control-measure. Mechanical control-measure includes: (a.) artificial reefs, and (b.) dune reconstructions; non-mechanical control-measure includes: (a.) constant coastal topographic monitor and meteorological observation, and (b.) shore management.
The artificial reefs which are sited on particular places with taking seasonal wave conditions into account through “coastal hydrodynamic numerical model”, the results have shown that those can actually reduce wave energy and speed partially even it cannot break waves before they are reaching fore-point of the artificial reef. Because of wave energy and speed decline eases up shoreline changes and increases sand drift deposits to create stability of shorelines. Besides, the function of a groin-head of Ai-Men set up can refract and diffract waves to create effect of sheltering, which helps deposits of sand drift.
The results of comparing the drawings created by MEPBAY software and aerial photographs from year of 1990 to 2008, it has shown and proven the high degree of shoreline overlaps between those two, and so does the static bay shapes of shoreline.
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