臺灣博碩士論文加值系統

本研究是針對削減波浪的波能為主，一般而言，如何削減波浪的波能使其對海岸或結構物的影響較小為海岸工程的重要目標。利用波浪通過孔隙結構物後的反射率，來了解波浪能量衰減的多寡。
本試驗在斷面水槽進行，水槽的一端為造波機，另一端則為孔隙結構物，利用五種不同的孔隙結構物型式，以增加波浪與結構物之間的作用區間和加大孔隙結構物材料的孔隙率為主，搭配50cm、70cm以及90cm三種水深，波浪週期為1.2秒至2.7秒，波高範圍為利用波浪尖銳度0.02至0.05做選取，探討波浪與孔隙結構物之間反射率的關係，並期望可以造出一消波設施，使波浪反射率皆小於10%，以便往後斷面水槽中，定床試驗的研究。
本試驗依據波浪的尖銳度(H/L)與無因次週波率(σ^2 h/g)與波浪的反射率做一探討，並討論實驗過程中觀察到波浪的碎波與未碎波與反射率的關係，結果顯示，波浪週期越大則反射率越大，透過孔隙結構物的改善，能夠有效的削減波能，使其反射率降低，而長波的反射率雖較高，但在消波設施的改善中，其對長波的波能損耗較顯著，而較短週期的波浪，由於未碎波的關係，其反射率有部分還大於週期較長但是產生碎波的波浪，可以得知，碎波為波浪衰減波能的主要方式。

This research is mainly for reduction of the wave energy, how to cut down the wave energy to let it less impact on the coast or structures is important for coastal engineering goals. Make use of waves through the porosity structures of reflectivity, to understand the amount of wave energy attenuation.
The test is carry on a cross-section sink, the sink has a wave maker in its end, and the other side is the porosity structure. Based on five different porosity structures type, in order to increase the active area between waves and structures and increase the porosity of the material, the water depth are 50cm、70cm and 90cm, and the waves period are from 1.2 sec to 2.7sec, the waves height range are use the waves steepness from 0.02 to 0.05 to make a selection, explore the reflectivity between the waves and the porosity structure relationship, and expectations to create a facility that can dissipate the waves energy and let the wave reflectivity less than 10%, sothe sink can do fixed bed test in the future.
The test are based on the waves steepness(H/L) and the dimensionless frequency rate(σ^2 h/g) to do a study with wave reflectivity, and discuss the waves break or not the relationship between the reflectance which are observed in the experimental process. The results show that the greater the wave period, the greater the reflectance, through the improvement of the structures, can effectively reduce wave energy, reducing its reflectance, as the long wave has higher reflectance, but in the wave absorption facility improve, the long wave can be more significant losses, and shorter wave which are not broken, its reflectivity greater than the long waves but the waves are broken informed that the waves broken is the main way to dissipate the waves energy.

目錄
摘要 I
Abstract II
第一章 緒論 1
1-1 前言 1
1-2文獻回顧 2
1-3 研究目的與方法 7
1-4 論文架構 9
第二章 水工模型試驗 10
2-1 實驗設備 10
2-2 消波設施模型設計與波高計配置 12
2-3 波浪條件設計 17
2-4 試驗步驟(圖2-4.1) 20
2-4-1 消波設施配置 20
2-4-2 波高計的架設 20
2-4-3 進水與波高計率定 21
2-4-4 觀察與記錄水位資料 21
2-5 分析方法 24
2-5-1 資料擷取 24
2-5-2 入射波分析 24
2-5-3 反射率分析 24
第三章 水工模型試驗結果 26
3-1 波浪尖銳度與反射率之關係 27
3-1-1 消波設施A 27
3-1-2 消波設施B 28
3-1-3 消波設施C 30
3-1-4 消波設施D 33
3-1-5 消波設施E 34
3-2 無因次週波率與反射率之關係 36
3-2-1 消波設施A 36
3-2-2 消波設施B 39
3-2-3 消波設施C 40
3-2-4 消波設施D 42
3-2-5 消波設施E 44
第四章 各種消波設施探討與比較 48
4-1 不同水深下與消波設施之關係 48
4-2 相同水深下與消波設施之關係 52
4-3 碎波與未碎波 55
4-4 接觸面積與消波設施之關係 58
4-5 消波設施綜合討論 61
第五章 結論與建議 65
5-1 結論 65
5-2 建議 66
參考文獻 67

參考文獻

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