Experimental Study of Reflected Waves on Inclined porous bed

• Main Authors: Yue-Hsien Lin, 林宇銜
• Other Authors: H.H. Hwuang
• Format: Others
• Language: zh-TW
• Published: 2003
• Online Access: http://ndltd.ncl.edu.tw/handle/65896250629120315391

碩士 === 國立成功大學 === 水利及海洋工程學系碩博士班 === 91 === The purpose of this study is to investigate wave reflections on smooth and varied porous inclined beds in a wave flume of Tainan Hydraulics Laboratory. Among the 585 tests, it was mainly categorized into two groups, which were those covered the entire inclined beds and those porous beds only covered the surf-zone region. The characteristics and reflection coefficients of waves propagate on porous beds of varied slopes, constructed material, porosities, the ratio of incident wave heights to thickness of constructed material and nonlineality were investigated.. Experimental results show that wave dissipation is influenced by porous inclined beds of varied material. The presented results also show that the larger the porosity is, the more wave energy would be dissipated. While nonlineality increases, the porosity increases with an decrease in influences of slope. Moreover, the ratio of incident wave heights to thickness of constructed material will influence the distribution of reflection coefficients on the porous inclined beds. The wave reflection influenced by incident wave height reveals more obviously on smooth beds. Finally, the distribution graghs of Ur combined with Hi、d、L and Cr yield that the wave dissipation of porous structure reveals more obviously subject to long waves.