頁籤選單縮合
題名 | 波浪作用下沙漣形成過程之數值模擬=Numerical Simulation of the Formation Processes of Wave Induced Ripples |
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作者 | 林銘崇; 江允智; | 書刊名 | 海洋工程學刊 |
卷期 | 3:2 2004.02[民93.02] |
頁次 | 頁39-57 |
分類號 | 443.1 |
關鍵詞 | 波浪; 沙漣; 形成過程; 數值模擬; Wave; Ripples; Formation process; Numerical simulation; |
語文 | 中文(Chinese) |
中文摘要 | 本文旨在以數值模擬計算由近似平坦底床發展至成熟沙漣之形成過程,文中流場數值模式主要以座標轉換及ADI有限差分法計算二階史托克(Stokes)有限振幅波作用下自由水面至沙漣底床邊界之二維流場。在底床變形計算方面,利用漂砂守恆方程式配合底床載漂沙量計算,由近似平坦沙面開始計算,以一波浪周期為單位,計算作用後之底床改變,並以此新得到之底床沙漣形狀進行下一波浪周期之流場及漂沙量計算,如此反覆計算直至形成成熟沙漣為止。計算結果並與黃(1995)及Lofquist(1978)所提出沙漣形成試驗結果進行比較,顯示結果合理。 |
英文摘要 | The paper investigates the formation processes of wave-induced ripples by numerical simulation. In the present study, the flow fields of surface waves over various sinusoidally shaped rigid ripples were calculated to recognize the formation of ripples. The coordinate transformed and ADI (Alternating Direction Implicit) finite difference method are used to calculate the flow field. In order to simulate the formation process of ripples from near even rough bottom to full-developed ripples, the present bed-load sediment transport is involved. We examine the bed level after every wave period and update it until the full-developed ripple formed. The results compared with Hwang (1995) and Lofquist (1978) and demonstrated that the numerical simulation predicted formation of ripples sufficiently well. |
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