Numerical Investigation of Wave Field around Submerged Breakwater

• Main Authors: KE-GUANG CHEN, 陳恪光
• Other Authors: RUEY-SYAN SHIH
• Format: Others
• Language: zh-TW
• Published: 2007
• Online Access: http://ndltd.ncl.edu.tw/handle/11149477247248394474

碩士 === 東南技術學院 === 防災科技研究所 === 95 === The variation of wave field and the path lines of water particles around submerged obstacles are being numerically investigated in this study by using the boundary element method (BEM). This study is an further extension of the 2D numerical wave flume developed by Chou and Shih, impermeable dikes were located in an arbitrary position of the flume, by using the BEM as well as applying the Lagrange description of fluid particles movements, the variations of wave field around the breakwater are analyzed using the path line and wave field when regular wave propagate over the breakwater,. Since the results was deeply affected by the width B of the breakwater, as well as the height D and σ2h/g, the tracking of water particles motion and the appearance of eddy is investigate in this study by using different conditions of B, D and σ2h/g. The water velocities of particles increase while waves propagate above the breakwater. It shows that the direction of the eddy under the wave crest rotate contrarily with the wave direction on both sides of the breakwater. The eddy phenomenon will be conspicuous when the width B of breakwater is larger or the height D greater, the occurrence was also found obviously in Double fixed breakwater.