臺灣博碩士論文加值系統

本研究探討波浪通過水下航道及矩形坑洞周圍所產生水位波高之互制變化問題，並利用實驗結果進行分析探討。本文是利用一個規則波浪來進行水工模擬試驗，其場地為一不透水底床，航道採用學者(William.G 1996)理論模擬的尺寸(1000m)並縮小為1/50後之試驗尺寸，波浪條件採用水下航道(18m)及矩形坑洞(長4m、寬2m)之間的三種不同間距及水深來探討。本研究是為了驗證水力工模型實驗觀測結果與學者(William.G 1996)利用線性淺水波理論所設計波高之分析結果。當一規則波浪經過單一水下航道時，發現在水下航道約1/3段時，左右兩側發生波高變大的現象，且呈明顯對稱的趨勢，且當波浪經過水下航道的航道中央處產生波浪變小的現象，此結果與William.G的理論分析結果相當接近。另一個實驗則是在水下航道前挖一個矩形坑洞，此實驗是應用三種不同間距(水下航道及坑洞之間)以及水深(0.65m、0.60m)來進行探討，證明William之理論波高及波峯分佈之分析結果與實驗方面之觀測波高數據及波峯之分佈相當接近。

This research is focus on surface waves interaction between navigation channel and rectangular pit. Regular waves were first used to initiate hydrodynamic simulation with an impermeability bottom. Followed by the William G (1996) with a scale model of one to fifty the navigation channel therefore been design. The conditions include three different distances (between the navigation channel and rectangular pit) and depths.The investigation of hydrodynamic model was attested in order to analysis the effects to Willian’s theory. The result show when regular waves passed the navigation channel for about one third of the channel, the wave seems to be accelerated by height and symmetrical. Moreover, when waves passed over the center of navigation channel it accunted for decrease on the wave height. This result shows quite the same result compare with William’s theory. The other experiment included a rectangular pit in front of the navigation channel with three different distances (between the navigation channel and rectangular pit) and two different depths (0.60m and 0.65m) that were been done. These experiments results also show close results between the experiment and the William’s theory.

中文摘要……………………………………………………………….. Ⅰ
英文摘要 ……………………………………………………………… Ⅱ
誌謝 …………………………………………………………………… Ⅲ
目錄 …………………………………………………………………… Ⅳ
表目錄 ………………………………………………………………… Ⅶ
圖目錄 ………………………………………………………………… Ⅷ
符號說明 ……………………………………………………………… IV


第一章 緒論 …………………………………………………………………………… 1
1.1 前言………………………………………………………….……………………… 1
1.2 研究動機與目的…………………………………………………………………… 1
1.3 預期成果…………………………………………………………………………… 2
1.4 內容架構與研究流程……………………………………………………………… 2

第二章 文獻回顧 ……………………………………………………………………… 4
2.1 緒言………………………………………………………………………………… 4
2.1.1 人為產生的現象……………………...…………………………………… 4
2.1.2 自然產生的現象…………………………….……………………………… 7
2.2 海域底床坑洞對波浪變動之影響………………………………………………… 8
2.3 小結………………………………………………………………………………… 10

第三章 實驗規劃與佈置……………………………………………………………… 11
3.1 實驗規劃…………………………………………………………………………… 11
3.1.1模型相似律………………………………………………………………………… 12
3.1.2實驗儀器…………………………………………………………………………… 15
3.2 實驗佈設…………………………………………………………………………… 17
3.2.1實驗條件…………………………………………………………………………… 17
3.2.2實驗場地佈置……………………………………………………………………… 19
3.2.3實驗步驟…………………………………………………………………………… 23
3.3 實驗數據資料取得與處理………………………………………………………… 25
3.3.1 試驗數據之取得…………………………………………………………… 25
3.3.2 波高試驗數據之取得……………………………………………………… 25

第四章 水下航道對波浪傳動特性之試驗成果分析……………………………… 26
4.1 前言……………………………………………………………………………… 26
4.2 波浪通過水下航道之波高影響分析…………………………………………… 26
4.3 波高係數與橫縱斷面之比較……………………………………………………… 40
4.3.1縱斷面波高之差異性……………………………………………………………… 40
4.3.2橫斷面波高之差異性……………………………………………………………… 45
4.4 小結………………………………………………………………………………… 48

第五章 水下航道及矩形坑洞對波浪傳動特性之試驗成果分析…………………… 49
5.1 前言………………………………………………………………………………… 49
5.2 波浪通過水下航道及矩形坑洞之波高影響分析………………………………… 49
5.2.1 第一類試驗條件(h=65cm, S=1.5m, H=5cm、7cm, T=1.0s、 1.2s)……………………………………… 49
5.2.2 第二類試驗條件(h=65cm, S=1.5m, H=5cm、7cm, T=1.0s、1.2s)……………………………………… 58
5.2.3 第三類試驗條件(h=65cm, S=1.5m, H=5cm、7cm, T=1.0s、1.2s)……………………………………… 67
5.2.4 第四類試驗條件(h=65cm, S=1.5m, H=5cm、7cm, T=1.0s、1.2s)……………………………………… 77
5.2.5 第五類試驗條件h=65cm, S=1.5m, H=5cm、7cm, T=1.0s、1.2s)……………………………………… 85
5.3 比較分析…………………………………………………………………………… 94
5.3.1 水下航道縱斷面波高之差異性…………………………………………… 106
5.3.2 水下航道橫斷面波高之差異性………………………………………… 122
5.4 小結……………………………………………………………………………… 142

第六章 結論與建議…………………………………………………………………… 143
6.1 結論……………………………………………………………………………… 144
6.2 建議……………………………………………………………………………… 145
參考文獻…………………………………………………………………………………… 146
作者簡歷…………………………………………………………………………………… 148

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