| Summary: | 碩士 === 國立臺灣大學 === 造船及海洋工程學研究所 === 89 === Design of “Artificial Habitats” with the function of shore protection is the main purpose of this research. Porous rectangular structures were introduced to mimic the feature of artificial habitats. Nine different structure dimensions were formed by the combination of six identical model units and each model unit was made by six different porosities, ranging from 0.42 to 0.91. Without the occurrence of breaking during wave propagation, each model case was tested by many incident wave conditions to study the influences of model height, width and the porosity of models on reflected and transmitted waves. The effects of layout of identical submerged porous structures were also studied here. Several conclusions were made from experimental results. The increase of structure height and width reduces apparently the transmitted wave height. With the same number of model units, the higher the structure height, the smaller the transmitted wave height. Reflected wave height is affected mainly by structure height and structure porosity. However, structure width has negligible effect on reflection. The increase of structure height and the decrease in porosity increase reflected wave heights. The structure with porosity in between 0.6 and 0.8 can damp more transmitted wave energy. Also, Bragg resonance reflection was detected by suitable alignments of identical submerged structure.
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