頁籤選單縮合
題 名 | 直立防波堤前海流導致底床沖刷之數值模擬=Numerical Modeling of Current-induced Erosion around the Head of Vertical-wall Breakwater |
---|---|
作 者 | 劉景毅; | 書刊名 | 海洋工程學刊 |
卷 期 | 3:1 2003.07[民92.07] |
頁 次 | 頁15-33 |
分類號 | 351.9 |
關鍵詞 | 海流導致之底床沖刷; 海域地形變化模式; Current-induced erosion; Sediment transport model; |
語 文 | 中文(Chinese) |
中文摘要 | 本文建立一水深平均二維海域地形變化模式,此模式加入考量底床坡度對臨界底床剪應力與平衡水深之影響,並應用於模擬分析麥寮港西防波堤堤前沖刷問題。模擬結果顯示,麥寮港西防波堤興建所造成防波堤堤頭附近之漲退潮流速與流向不對稱以及強大速度梯度所引起之輸砂量不平衡現象應為導致堤前發生嚴重沖刷之主因,而底床沖刷現象應主要發生於大潮期間流速較強時。坑洞形成過程係首先在堤頭附近發生底床沖刷,然後逐漸加深形成主坑洞,再往外海方向拓展擴大。 |
英文摘要 | A depth-averaged sediment transport model was developed and applied to study the erosion process around the head of vertical-wall breakwater at Mailiau Harbor. The effect of bed slope to threshold bed shear stress is included in the model in order to confine equilibrium scour depth. Modeling results reveal that the scour hole in front of breakwater head is caused by strong velocity gradient and unbalance sediment transports around vertical-wall breakwater during the flood and ebb tides, especially in the spring tide period. Results also show that main scour hole occurs in front of breakwater head firstly, then deepens gradually and spread out to offshore. |
本系統中英文摘要資訊取自各篇刊載內容。