Wave Scattering of Random Waves by a Composite Wavy-type Submerged Breakwater

• Main Authors: Chun-Yi Li, 李俊毅
• Other Authors: Ching-Yun Yueh
• Format: Others
• Language: zh-TW
• Published: 2007
• Online Access: http://ndltd.ncl.edu.tw/handle/48276414097226291226

碩士 === 國立臺灣海洋大學 === 河海工程學系 === 95 === Abstract 　　By using the numerical simulations of a BEM model, the wave characteristics in front of composite wavy-type submerged dikes induced by irregular waves were investigated. The incident wave spectrum is either Bretschneider or JONSWAP spectrum. Different layouts were created by changing the relative submerged depth, number of dikes and distance between dikes. The numerical results show that, for the cases of different relative submerged depth under the wave actions of Bretschneider spectrum, the reflection coefficient arise as the depth decreased; for the cases of different number of submerged dikes under the wave actions of JONSWAP spectrum with different wave periods, the peak value and the number of peaks in the reflection coefficient curves increased as the number of dikes increased. 　　For the relations between the reflection coefficient, width of dike (B), distance between dikes (S), and the wave length above the dike ( ), in all cases, the results show that the peak values of reflection coefficient occur at =1.0 and 2.0, and is increased as S increased. The second peak is found always smaller than the first peak. Keywords: Boundary element method, Irregular waves, Reflection, Composite wavy-type submerged dike