Study on the characteristics of internal velocity field induced by a solitary wave propagating over a sloping bottom

• Main Authors: Ya-Ning Shih, 石雅寧
• Other Authors: Chang Lin
• Format: Others
• Language: zh-TW
• Published: 2011
• Online Access: http://ndltd.ncl.edu.tw/handle/18414283888612026753

碩士 === 中興大學 === 土木工程學系所 === 99 === The purpose of this study is to investigate the characteristics of internal velocity field induced by a solitary wave propagating on 1:10 sloping bottom using the flow visualization technique and time-resolved particle image velocimetry (PIV). The characteristics of flow fields induced by solitary waves with different wave-height (H0) and water-depth (h0) conditions are discussed. (1) The maximum horizontal velocity (umax-up) along the x direction to the vicinity of the breaking point increases gradually after the rapid decay of the resulting situation. Therefore, the study used the maximum horizontal velocity (uhmax) of horizontal bottom bed as velocity scale and employed the water depth (h0) of horizontal bottom bed as length scale. The study has shown the similarity results of maximum horizontal velocity distribution in different solitary wave conditions over a sloping bottom. (2) Run-down flow propagates to offshore direction over a sloping bottom. In order to investigate the characteristics of maximum adverse velocity distribution in run-down process, the study applied the location of shore line as the basis reference and shifted the horizontal reference position to obtain the similarity of maximum adverse velocity.