本研究採用沉箱式防波堤，研究波浪和堤之交互作用，以水工模型實驗量測入射波、反射波和透過波，考慮孔隙結構基座在露出靜水面和沒入靜水面的情況下，考慮不同大小粒徑、單層和雙層孔隙介質區，分析其反射率、透射率等消波特性，探討這些情況下的消波效能。

水工試驗方面，以玻璃珠作為孔隙介質，浪波條件考慮符合線性波理論的範圍，水深採用72 公分和40 公分水深兩種，單層粒徑各進行一次試驗，雙層粒徑採用直徑16mm 和35mm 的玻璃珠進行一次試驗，觀測並記錄試驗過程後，進而分析其消波特性。數值解析方面，純水區和孔隙區特徵值的計算採取牛頓法和沃德法，可以確實求解出來，代回延散方程式中驗證亦正確。目前在進行一連串疊代的過程中，在沉箱吃水較深時，尚未收斂。但加大mode 數和降低吃水深，有時可以增加收斂的可能性。由於切割分層數目較前人更複雜，尤其在需要的mode 大的時候，邊界條件組成的矩陣複雜度更
大。在沉箱下孔隙區計算出來的流速，疊代到後來非常大，以至於容易在求解過程中，產生正無限大或負無限大的錯誤。

本文之沉箱式防波堤，於波長較短時，摩擦阻力影響變大，反射率和透射率在波長較短時，有變低的趨勢。波長較長時，摩擦阻力影響變小，且在沉箱的影響下透水性較差，大部分能量反射，消波效能較差。在孔隙區沒入水中時，沉箱式防波堤約可固定消減掉三成到四成的能量；在孔隙區露出水面時，沉箱式防波堤消波效果更好，通常消能三成到七成，最高可以達到約九成左右。沉箱式防波堤反射率較大，透射率卻相當低，對於堤後方水域的保護效果顯著。透射率趨勢和粒徑大小有關，粒徑越小透射率相對越小，但造成之反射率相對較高。雙層粒徑堤跟同水深的其他單粒徑模型相比，消波
效能較好。無論長週期或短週期，雙層粒徑堤的表現較穩定。除了在長週期時，消波效能跳動範圍較大，其他週期都在相對偏低的位置。

In the study, wave reflection, transmission, and energy dissipation with a caisson-type breakwater have been investigated experimentally. Three different sizes of grain are used to construct the porous base, they are 16mm, 25mm, and 35mm, respectively.Single and double layers of porous base are considered.

Hydraulic test, porous media choice is glass ball.Wave conditions must be consistent with the scope of the linear wave theory. Two different depths are used to construct,they are 40 cm and 72 cm. Do a single trial of all size. Double size 16mm and 35mm
diameter glass ball is a test. Recording the test process, and then analyze energy
consumption. Water area's characteristics and pore area's characteristics are calculated
by the Newton’s method and the Ward’s method. It is the substitute for the dispersion
equation is also correct. During the course of a series, the draft of caisson is deeper, the
convergence is harder. But the increase and decrease the mode number or the draft, and
sometimes increase the possible of convergence. As the number of cutting layer are
more complex than other predecessors, particularly in the large number of required
mode, when the composition of the matrix of boundary conditions greater complexity.
In the caisson area calculated pore velocity, or on behalf of the later is very large, so it's
easy in the solution process, generate positive infinity or negative infinity error.

As the caisson-type breakwater with a shorter wavelength, the frictional resistance influences bigger. At this time, reflectance and transmittance has the Drop tendency.When the wavelength is longer, the frictional resistance influences smaller. Most of the
energy reflection because the caisson of less permeable. The caisson-type breakwater got the wave force to increase. The effect is bad in the Wave force reduced. If the static water surface above the pore structure, the caisson-type breakwater can be reduction of about 30% to 40% off the energy. If the static water surface under the pore structure, the
caisson-type breakwater wave damping efficiency is better. Usually remove 30% to 70% energy. Sometimes, it’s up to about 90%.Reflectivity of the caisson breakwater is larger, but the transmissivity is lower. For the waters behind the breakwater, the
protective effect is significant. Transmissivity trend is arranged according to media size. As the media size smaller, the transmissivity is smaller, the reflectivity is higher. At the same depth, double-size model compared with other single-size model of the wave
forces reduced is better. Whether long or short period, double-size model's performance is relatively stable. Except to a long cycle time, the wave damping efficiency has a larger range. Other cycles are at the lower position.

目錄
誌謝…………………………………………………………I
中文摘要……………………………………………………IV
英文摘要……………………………………………………V
圖表目錄……………………………………………………VI
符號說明……………………………………………………IX
第一章緒論............................................................................ 1
1.1 前言................................................................................. 1
1.2 文獻回顧......................................................................... 2
1.3 本文目的......................................................................... 2
1.4 論文架構......................................................................... 3
第二章基本假設和理論推導................................................ 4
2.1 基本假設......................................................................... 4
2.2 控制方程式..................................................................... 4
2.3 邊界值問題..................................................................... 6
2.4 邊界值問題解析............................................................. 8
2.4.1 純水區和介質區的延散方程式.................................. 8
2.4.2 特徵值在垂直方向上的關係................................... 13
2.4.3 未知係數A、B 討論................................................. 14
第三章水工模型試驗佈置與步驟..................................... 24
3.1 試驗設備....................................................................... 24
3.2 試驗配置....................................................................... 25
3.3 試驗步驟....................................................................... 26
3.4 試驗條件....................................................................... 26
第四章試驗分析與討論......................................................32
4.1 資料分析方法................................................................32
4.1.1 反射率分析................................................................32
4.1.2 透射率分析................................................................32
4.1.3 能量消散狀況分析....................................................33
4.2 實驗結果討論...............................................................33
4.2.1 相同粒徑下的比較....................................................33
4.2.2 同水深情況下的比較............................................... 35
4.2.3 尖銳度和反射率、透射率、剩餘能量的討論....... 36
第五章結論與建議............................................................. 54
5.1 結論............................................................................... 54
5.2 建議............................................................................... 54
參考文獻..............................................................................55
附錄一、孔隙介質流場之勢流理論..................................57
附錄二、沉箱式防波堤分析程式碼..................................61

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