| 研究生: |
翁和約 Weng, Ho-Yueh |
|---|---|
| 論文名稱: |
波浪通過三向透水潛堤之研究分析 Analysis of Waves Passing over three-directional Porous Submerged Breakwater |
| 指導教授: |
李兆芳
Lee, Jaw-Fang 許泰文 Hsu, Tai-Wen |
| 學位類別: |
碩士 Master |
| 系所名稱: |
工學院 - 水利及海洋工程學系碩士在職專班 Department of Hydraulic & Ocean Engineering (on the job class) |
| 論文出版年: | 2003 |
| 畢業學年度: | 91 |
| 語文別: | 中文 |
| 論文頁數: | 70 |
| 中文關鍵詞: | 三向透水潛堤 |
| 外文關鍵詞: | three-directional Porous Submerged Breakwater |
| 相關次數: | 點閱:75 下載:3 |
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本研究為探討三向透水之型塊對波浪反射和透過作用之影響,利用不同之波浪入射條件搭配不同尺寸的型塊潛堤來比較波浪變化情況,變換潛堤之堤頂沉沒水深以探求各項條件下的最佳效果,並架設攝影機紀錄觀察波浪通過三向透水潛堤後,堤頂透水孔產生上衝水流之現象,同時也觀察水流對入射波浪影響之情形。最後依據各項試驗數據資料,期能找出具親水性、景觀性及安全性的海岸保護結構物,並評估實際應用之可行性。
考慮試驗佈置方便性且不影響消波功能,採用三通塑膠管作為透水孔徑,用木板製造單列式形式之三向透水潛堤模型,然後混凝土灌製完成。潛堤模型為配合保護堤趾免受淘刷之功能,結構物底部設為不透水底板,使具有消除部分入射波能,降低海堤堤面之溯上高作用,同時可防止底部被淘刷。
經試驗結果發現,波浪通過透水潛堤時,其透過波浪減弱現象會隨著潛堤透水孔徑增加而降低,且隨著潛堤沉沒水深增加而降低;另外觀察發現,潛堤透水孔徑若大小一致或潛堤沉沒水深太大,波浪通過時潛堤堤頂時,預期產生之水流效果均不明顯。當調低潛沒水深並變更透水孔徑,使潛堤透水孔徑束縮比例越大,潛堤堤頂透水孔水流上衝效果則愈顯著。
The purpose of this thesis is to investigate wave reflection and transmission from a proposed porous structure that is permeable to water flow in three directions. The experiments are conducted in a wave channel that is 50cm wide, and equipped with a piston type wavemaker. The porous structures are constructed with concrete, and permeable flow paths are formed using connected plastic pipes. The porous structures are of two different sizes, namely, 12cm and 16cm square in height and width. The water depths used in the experiment are 16cm and 20cm. The wave periods are 1.0sec, 1.2sec, 1.5sec, 1.7sec and 2.0sec. In the experiment, wave reflection and transmission by the porous structure are measured, meanwhile, effects of up-flushing water flows produced by penetrating waves through porous structure are also observed. One of the present objectives aims at if the up-flushing flow induced by the designed porous structures would be capable of deducing incident waves passing the structure.
The experimental results show that when the structures are submerged, the generated up-flushing water flows are not strong enough to deduce incident waves. While the top positions of the structures are at mean water level, the up-flushing flows can be better observed. And when the porous paths inside the structures from the front position going to top position are decreased in diameters, the strengths of up-flushing flow can be increased. Preliminary results of the present experimental study indicate that utilizations of porous structures to generate up-flushing flows may need further investigation on the design of flow path diameters or flow directions to strengthen the effects. However, on practical applications the design concept of up-flushing effects against incident waves can be useful if environmental landscape designs are combined into engineering considerations.
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