臺灣博碩士論文加值系統

中文摘要
本文以多重排列式直立圓柱堤為對象，理論計算以Mei et al.(1974)，Mei (1983)提出波浪通過直立孔隙板之理論為基礎，推廣出多排圓柱堤之理論解，並以水工實驗探討在不同波浪條件下多排直立圓柱堤之消波性能，理論及實驗有良好一致性，結果顯示單排圓柱體中，入射波形尖銳度增加及相對水深減小時，反射率增加及透射率減小，消波性能較佳。影響雙排及三排圓柱堤消波性能最顯著的因素為相對排距，隨著多排堤排距的變化，堤前總反射波及堤後總透射波為不同相位成分波疊合成波高相異之合成波，在特殊相對排距下能同時降低反射率及透射率，當排距為波長之四分之一時總反射波及總透射波合成波波高皆出現極小值，消波效果為最佳，而排距為波長之二分之一時消波效果為最差。另根據理論解及部分實驗結果可得知增加排數確可提高其消波性能，但過多的排數並無太大的功用。
關鍵字：透水堤，圓柱堤，浮式防波堤，反射率，透射率，能量損失，孔隙比，消波特性

Abstract
In this thesis, an experiment of wave sheltering by multi-layer vertical cylinder fences was conducted in a wave flume. The incident, reflected and transmitted waves were measured. Then the reflection and transmission coefficients and energy losses were estimated. Under the assumption of shallow water wave Mei(1983) proposed a theoretical solution for the reflection and transmission coefficients as the wave propagates through a one-layer cylinder fence. For multi-layer fence system, the analytic solution can be proposed under the assumption of linearity. Results show that theoretical computations agree well with the experiment. For one-layer fence system, the reflection coefficient increases and transmission coefficient decreases as the wave steepness increases. For multi-layer fence system, the reflection and transmission coefficients are both maximum as the ratio of the layer spacing to the wave length(S/L) is 1/2. On the other hand, the coefficients are minimum, as the ratio is 1/4. Furthermore, a multi-layer system has better sheltering effect then single-layer one. Of cause, increasing number of layer can increase the energy losses but too much layer is not economical.
Keywords: Cylinder fence, Permeable breakwaters, Porosity, Reflection coefficient, Transmission coefficient, Wave barrier, Wave damping.

目 錄
內容 頁次
中文摘要 Ⅰ
英文摘要 Ⅱ
目錄 Ⅲ
圖目錄 Ⅴ
符號說明 Ⅷ
第一章 緒論…………………………………………………….. 1
1-1 研究背景及目的……………………………….. 1
1-2 文獻回顧……………………………………….. 2
第二章 理論分析…………………………………………….. 7
2-1 單排理論……………………………………….. 7
2-2 多排理論分析………………………… 10
第三章 實驗方法…………………………………………….. 14
3-1 實驗設備及配置…………………………….. 14
3-2 波浪條件……………………………………….. 16
3-3 分析方法……………………………………….. 17
3-4 實驗步驟…………………………………….. 18
第四章 結果與討論……………………………………….. 19
4-1 束縮流量係數(empirical discharge coefficient)的決定. 20
4-2 單排圓柱堤的探討………………………….. 20
4-2-1 波形尖銳度 對單排圓柱堤消波特性的影響…20
4-2-2 相對水深 對單排圓柱堤消波特性的影響…. 21
4-3 多排圓柱堤的探討…………………………….. 21
4-3-1 相對排距 對雙排圓柱堤的影響………….. 21
4-3-2 相對排距 對三排圓柱堤的影響………….. 23
4-3-3 圓柱堤排數對消波性能的影響……………. 24
第五章 結論與建議…………………………………………….. 26
5-1 結論………………………………………….…. 26
5-2 建議………………………………………….…. 26
參考文獻 28
附錄A 61

參考文獻
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