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題名 | 離堤水面壓波板對表面波之影響 |
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作者姓名(中文) | 蔡清標; 許俊文; | 書刊名 | 力學 |
卷期 | 10:4 1994.12[民83.12] |
頁次 | 頁289-296 |
分類號 | 443.31 |
關鍵詞 | 水面壓波板; 波浪反射率; 直立堤; 波壓; Horizontal plate; Wave reflection; Breakwater; Wave pressure; |
語文 | 中文(Chinese) |
中文摘要 | 本文旨在研究一均勻水深中直立堤前離堤固定之水面壓波板對表面波動之影響, 探討壓波板對波浪之反射率與透射率及作用於壓波板與直立堤之波壓特性。理論分析以微小 振幅波理論,配合直立堤、壓波板與底部不透水等邊界條件,及板兩端之流量連續與能量流 通率守恆條件,以分離變數法及正交函數之關係解得流場之波動解;文中計算各種不同板長 與離堤距所組合之複合斷面引致的波動等性。結果顯示,固定板長時,波浪反射率係隨波浪 參數值 C ( C= σ�� d/g, σ為波浪週波率,d 為水深,g 為重力加速度)之增加而遞減 至最低值後再遞增。反射率之理論值與實驗值大致吻合,但在較小之波浪參數C值情況,因 板下實際有氣袋形成,導致壓力之實驗值與理論值差異稍大。由理論及實驗結果顯示,堤前 水面壓波板對防波堤之波壓有顯著降低之作用。 |
英文摘要 | The wave reflection and transmission from a horizontal plate at the water surface which is fixed in front of a breakwater are investigated theorectically and experimentally in this paper. The boundary-value problem governed by the Laplace equation is solved by the separation variable method from the equations of the mixed type boundary conditions, and the conservation of mass and energy flux between adjacent regions. The wave pressures acted on the breakwater and the horizontal plate are obtained. It is found that, for any fixed length of plate, the wave reflection decreases to a minimum value then increases when the wave parameter C increases. The wave parameter C is defined as σ�� d/g, where σ is the wave frequency, d the water depth and g the gravitational constant. Model study was also carried out in a two-dimensional wave flume to measure the reflection coefficients and the pressures on the breakwater and the plate. Wave transformation and breaking over the plate can be investigated in conditions with small values of C. Nevertheless, theoretical results of the reflection coefficitents and pressures on breakwater are well in comparison with the model measurements. |
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