臺灣博碩士論文加值系統

本文旨在探討波浪通過光滑斜面與不同材質之孔隙斜坡底床後波浪反射率之變化。孔隙斜坡底床建立於成大水工試驗所雷射實驗室小型斷面水槽之斜坡底床上，在585組規則波試驗當中，主要可將模型條件區分為鋪設全段斜坡底床與僅鋪設碎波帶底床兩種型態，分別探討波浪經過孔隙斜坡底床後之變化特性及波浪反射率並探討坡度、孔隙結構物材質、入射波高與孔隙材料厚度比值及非線性強弱對反射率的影響。
實驗結果顯示不同材質之孔隙底床對於波浪減衰的影響，孔隙率越高者消波性能越佳，而坡度對反射率的影響在非線性越強時，孔隙率越大者坡度的影響越小。再者，入射波高和孔隙材料厚度比值的改變會影響孔隙斜坡底床反射率的分佈；在無孔隙結構物被覆的光滑斜面，入射波振幅對於波浪反射的影響更是顯著。最後，由波高、水深、波長等因子結合成之無因次參數 與反射率 的分佈曲線可得知孔隙結構物對於長波的波浪場消波效果最為顯著。

The purpose of this study is to investigate wave reflections on smooth and varied porous inclined beds in a wave flume of Tainan Hydraulics Laboratory. Among the 585 tests, it was mainly categorized into two groups, which were those covered the entire inclined beds and those porous beds only covered the surf-zone region. The characteristics and reflection coefficients of waves propagate on porous beds of varied slopes, constructed material, porosities, the ratio of incident wave heights to thickness of constructed material and nonlineality were investigated..
Experimental results show that wave dissipation is influenced by porous inclined beds of varied material. The presented results also show that the larger the porosity is, the more wave energy would be dissipated. While nonlineality increases, the porosity increases with an decrease in influences of slope. Moreover, the ratio of incident wave heights to thickness of constructed material will influence the distribution of reflection coefficients on the porous inclined beds. The wave reflection influenced by incident wave height reveals more obviously on smooth beds. Finally, the distribution graghs of Ur combined with Hi、d、L and Cr yield that the wave dissipation of porous structure reveals more obviously subject to long waves.

中文摘要I
英文摘要II
謝誌IV
目 錄V
圖目錄VI
表目錄VIII
符號說明IX
第一章緒論1
1.1 研究動機1
1.2 文獻回顧3
1.3 本文組織7
第二章實驗設計及方法8
2.1 因次分析8
2.2 實驗設備10
2.3 實驗條件12
2.4 資料分析14
2.5 實驗佈置17
2.6 實驗步驟19
第三章 實驗結果與討論21
3.1 孔隙斜坡底床試驗結果之比較21
3.2 碎波帶鋪設孔隙斜坡底床試驗結果之比較34
第四章 結論與建議38
4.1 結論38
4.2 建議39
參考文獻40

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