| Summary: | 碩士 === 國立成功大學 === 水利及海洋工程學系專班 === 94 === The coast is a dynamic response that shorelines and beaches are subject to natural processes such as waves, tides, currents and sea level changes as well as human activities. Human activities that interrupt the sediment transport balance have direct and indirect influences on changes of the coast. Human induced coastal erosion in Taiwan include (1) reduction of sediment supply from rivers; (2) constructions of improper structures and (3) over pumping of ground water resulting in land subsidence.
This study aims at the analyses of topography changes along the coast of Tainan county in Taiwan. At first, a bulk of field data such as waves, typhoon, currents, sediment transportation, coastal topographical evolutions and beach profiles in the area are collected. Statistical and hydrodynamic methods are used to examine the reasons of beach evolution. Numerical models for simulating coastal processes such as the wave field, nearshore currents and shoreline changes are performed to investigate mechanism of beach erosion. According to these analyses, some conclusions to collect the affecting factors for beach changes could be draw. Changes wave field, tidal current and coastal process were compared through model results. It is concluded that human-intervention is the key factor causing coastal erosion along Tainan coast.
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