臺灣博碩士論文加值系統

本研究以水工模型試驗，探討規則波、不規則波、多方向不規則波通過1/20斜坡及斜坡上有潛堤時，在潛堤上方有、無碎波的條件下，潛堤附近波場之變化試驗中，波高計量測方式以潛堤中心線直列進行量測，並搭配週期入射斜坡。
再將分析後的量測結果繪製成二維圖，藉此探討波浪通過斜坡上潛堤後，其波場中心線折射、繞射現象，以及潛堤前方、上方與後方的波浪變形和波高變化，進而了解潛堤附近波場波浪變形之情況。
由試驗結果發現，波浪通過潛堤會受到潛堤高所影響，造成堤前的反射波，在堤上則會因為淺化，折射以及繞射使得波浪變形，堤後受到兩側波浪繞射波集中以及水深變深使得波浪變大。

This study employed a hydraulic mode experiment to discuss how change took place in the wave filed near the submerged breakwater when irregular waves, regular waves, and multi-directional irregular waves passed through a 1/20 sloping breakwater on conditions of no breaking waves on the submerged breakwater. Moreover, a wave gauge was utilized to measure linearly along the central line of the submerged breakwater, with reference to a periodic incident angle on the slope.
Then, measurement results from the analysis were mapped into a two-dimensional drawing, which was utilized to discuss the phenomenon of refraction and diffraction of the central line of the wave field. Moreover, the change in wave form and wave height in front of, above and behind the submerged breakwater were also discussed to further understand how waves in the wave field near the submerged breakwater changed shape.
Results from the experiment show that waves passing through the submerged breakwater were affected by the height of the submerged breakwater, which caused reflected waves before the breakwater. On the breakwater, due to shallow bottom, refraction and diffraction, waves, shape changed. And behind the breakwater, as the wave diffraction concentrated and the water was deeper, the waves height became bigger.

目錄
摘要.............................................................................................................................. Ⅰ
Abstract........................................................................................................................ Ⅱ
目錄.............................................................................................................................. Ⅲ
圖目錄.......................................................................................................................... Ⅴ
表目錄.......................................................................................................................... Ⅶ
照片目錄......................................................................................................................Ⅷ
第一章 緒論.................................................................................................................. 1
1-1研究動機................................................................................................................ 1
1-2前人研究................................................................................................................ 2
1-3研究方法................................................................................................................ 3
1-4本文組織................................................................................................................ 3
第二章 試驗配置與方法.............................................................................................. 4
2-1 試驗設備和儀器................................................................................................... 4
2-1-1平面水槽和蛇形造波機...................................................................................4
2-1-2 波高計和增幅器............................................................................................. 5
2-1-3 資料擷取系統與軟體..................................................................................... 6
2-2 試驗模型製作與配置........................................................................................... 8
2-2-1 試驗地形與潛堤模型製作與佈置................................................................. 8
2-2-2 試驗儀器設置與量測範圍............................................................................. 9
2-3 試驗條件..............................................................................................................10
2-3-1方向分佈函數................................................................................................ 11
2-4 試驗內容............................................................................................................. 12
2-4-1 儀器率定....................................................................................................... 12
2-4-2 試驗資料取得與分析................................................................................... 13
2-4-3零上切法........................................................................................................ 14
2-4-4 試驗流程....................................................................................................... 15
第三章 平面波場變化結果與分析............................................................................ 16
3-1 試驗量測穩定度分析檢討................................................................................. 16
3-2 波浪通過1/20斜坡之結果與分析.....................................................................18
3-3 波浪通過1/20斜坡上長3米寬1米潛堤之結果與分析…............................24
3-4 波浪通過1/20斜坡上長3米寬2米潛堤之結果與分析................................30
3-5規則波縱剖面波高變化之比較.......................................................................... 36
3-5-1 規則波之Kd值與淺化係數Ks之比較...................................................... 36
3-5-2 規則波不同週期同地形之比較................................................................... 39
3-6 不規則波同地形不同示性週期之比較.............................................................41
3-6-1 不規則波通過斜波上無潛堤之討論........................................................... 41
3-6-2 不規則波通過斜波上長3米寬1米潛堤之討論........................................43
3-6-3 不規則波通過斜波上長3米寬2米潛堤之討論........................................45
3-7不規則波同地形不同週期之比較...................................................................... 47
3-7-1不規則波通過斜波上無潛堤之討論.............................................................47
3-7-2不規則波通過斜波上長3米寬1米潛堤之討論.........................................49
3-7-3不規則波通過斜波上長3米寬2米潛堤之討論..........................................51
第四章 結論與建議.................................................................................................... 53
4-1 結論.....................................................................................................................53
4-2 建議.....................................................................................................................54
參考文獻......................................................................................................................55
謝誌..............................................................................................................................56
作者簡歷......................................................................................................................57

1.Yoshimi Goda, Random seas and Design of Maritime Structures, p28-29