Experimental study on the energy dissipation due to the composite porous structures

• Main Authors: Chien-Ming Lin, 林建明
• Other Authors: Sung-Shan Hsiao
• Format: Others
• Language: zh-TW
• Published: 2006
• Online Access: http://ndltd.ncl.edu.tw/handle/55848407096456052180

碩士 === 國立臺灣海洋大學 === 河海工程學系 === 93 === The purpose of this study is to investigate incident wave energy dissipation due to the combinations of porosity, width of porous wall and floating structure in a harbor due to the porous wall and dock. In this study, a series of experiments were conducted to examine the effect of the wave energy dissipation with different incident waves due to the composite porous structure. The results show that the composite porous structure with porosity equals to 0.6 has more effect on energy dissipation for a fixed width of porous wall and floating structure, while the non-dimensional frequency less than 1.0. For a fixed porosity of porous wall and width of floating structure, B/h=0.95 is more effective on energy dissipation as the non-dimensional frequency less than 1.0. An opposite trend can be found when non-dimensional frequency is more than 1.0. The non- dimensional width of floating structure D/h=0.95 has more effect on wave energy dissipation, with the fixed porosity and width of porous wall. For the long period wave, reflection coefficient decreases when the effective depth decreases, with the fixed porosity and width of porous wall and width of floating structure. It also finds that the composite porous structure with porosity n1=0.6, the non- dimensional width of dock B/h=0.95 and the non- dimensional width of floating structure D/h=0.95, can reduce 90% wave energy.