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完整後設資料紀錄
DC 欄位 | 值 | 語言 |
---|---|---|
dc.contributor.advisor | 丁肇隆 | |
dc.contributor.author | Fang-Cheng Li | en |
dc.contributor.author | 李芳承 | zh_TW |
dc.date.accessioned | 2021-06-16T13:27:41Z | - |
dc.date.available | 2018-07-30 | |
dc.date.copyright | 2013-07-30 | |
dc.date.issued | 2013 | |
dc.date.submitted | 2013-07-23 | |
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Reflection and transmission characteristics of regular and random waves from a submerged horizontal plate. Coastal Engineering 13, 161-182. [33] Rey, V., Belzons, M., Guazzelli, E., 1992. Propagation of surface gravity waves over a rectangular submerged bar. Journal of Fluid Mechanics 235, 453-479. [34] Torrence, C., Compo, G.P., 1998. A practical guide to wavelet analysis. Bulletin of the American Meteorological Society 79(1), 61-78. [35] Wei, G., Kirby, J. T., Grilli, S. T., Subramanya R. (1995) “A fully nonlinear Boussinesq model for surface waves. Part 1. Highly nonlinear unsteady waves,” Journal of Fluid Mechanics, Vol.294, pp. 71-92. [36] Wu, W.C., Liang, S.J., Chen, Y.C., Jheng, Y.T., 2011. Numerical studies of bathymetry effects on waves deformation using shallow water equation. 海洋工程學刊,11(2),171-186頁。 [37] 莊士賢,吳立中,董東璟,高家俊(2007):高維小波轉換應用於波場影像的波速與群波速分析之初探,第29屆海洋工程研討會論文集,553-558。 [38] 莊士賢,吳立中,董東璟,高家俊(2008):時空合域連續小波轉換分析近海波場影像可行性探討,第30屆海洋工程研討會論文集,194-198。 [39] 莊士賢,吳立中,董東璟,高家俊(2009):時空合域連續小波轉換應用於波流場影像分析—非均勻性波流作用之解析,第31屆海洋工程研討會論文集,745-750。 [40] 吳立中,莊士賢,董東璟,高家俊(2010):連續小波轉換應用於遙測影像之分析—海底地形之解析,第32屆海洋工程研討會論文集,665-670。 [41] 莊士賢,吳立中,董東璟,高家俊(2010):時空合域連續小波轉換應用於岸基雷達觀測近岸波流場之可行性研究,第32屆海洋工程研討會論文集,671-676。 [42] 沈茂霖,黃清哲(2007):不規則波通過潛堤之變形,海洋工程學刊,7(2),47-67頁。 [43] 陳鴻彬,蔡清標,陳信佑(2007):潛堤與海堤間波浪變形特性之數值模擬,第29屆海洋工程研討會論文集,95-100。 [44] 陳恪光,石瑞祥(2007):沒水潛堤所引起的波動流場變化之數值研究,第29屆海洋工程研討會論文集,361-366。 [45] 許朝敏,林銘崇(2008):數值模擬波浪通過潛堤之變形,第30屆海洋工程研討會論文集,57-62。 [46] 林詹翰,黃材成(2008):不規則波通過梯形系列潛堤之布拉格共振數值研究,第30屆海洋工程研討會論文集,254-258。 [47] 林詹翰,唐宏結,黃材成(2009):不規則波通過梯形系列潛堤之布拉格共振數值研究,海洋工程學刊,9(1),59-79頁。 [48] 吳一平,李忠潘(2010):潛堤消波特性之實驗研究,第32屆海洋工程研討會論文集,201-205。 [49] 許朝敏,林銘崇(2010):波浪通過橢圓形潛堤之變形,海洋工程學刊,10(2),143-162頁。 [50] 蔡清標,馬煒倫(2011):潛堤與海堤間之波流場變化研究,第33屆海洋工程研討會論文集,281-286。 | |
dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/62099 | - |
dc.description.abstract | 本文藉由在台大工程科學暨海洋工程所基礎流力實驗室中的斷面造波水槽,應用造波系統配合高速攝影技術與光學系統拍攝一系列波浪通過台階式結構物的波浪影像,再利用影像處理技巧進行邊緣偵測,數位化、分析波浪連續自由液面高程。其中從全尺度拍攝中,成功地利用LabVIEW發展多斷面影像連結技術與邊緣偵測技術,藉由量測Y軸向放大影像觀察所波浪通過潛堤細部物理特徵現象,同時,數位化水面高程資料,透過Matlab發展二維快速傅立葉轉換(2DFFT)結合一維Morlet小波轉換(1DMWT)方法完整分解波浪訊號。
由於高速攝影機進行多斷面全尺度波浪液面量測方法,取樣速度快且空間解析度高,所以優於一般低取樣數的CCD量測與傳統波高計量測,由Y軸向放大影像和連結結果,所得到連接面誤差低於2像素(Pixel),且在時間軸上幾乎可達無誤差。另外,本文提出的方法,更可以分解任意不同水深條件下,波浪通過構物之入反射波、高階諧和波與自由波和強迫波訊號,對於分析波浪複雜的非線性交互作用現象具有相當的實用性,作者所發展的方法也得到良好的驗證。 實驗研究針對波浪過不同堤寬Bx之矩形潛堤探討其高頻諧和波生成影響,透過能量通率(E*Cg) 空間分佈計算,在能量(振幅)與能通量(E*Cg)觀點下,將結果進行最佳化參數,利用入射波條件Ur.數並引入 〖〖(B〗_x/λ_i)〗^(±n)參數,訂定出以二階諧和波生成門檻值,分析結果得到n=0.09;再以能通量觀點,其中強迫波與自由波能量生成,分析結果得到分別n=+0.39與n=-0.32。研究中也針對主頻率與二倍頻空間振幅關係,提出一組數學方程組模擬,空間上模擬因摩擦效應振幅曲線中的衰減率,不能忽視。最後探討,探討波浪通過潛堤時,在Step1與Step2 所造成之反射率、透射率與能量消散影響。本實驗結果相當具可信度與參考價值,可提供數值模式發展研究者,進行比對驗證之。 | zh_TW |
dc.description.abstract | This study used wavemaker system and high speed camera tech with optical system to take wave passed over a step construct images at the fundamental fluid mechanics lab, department of Engineering Science and Ocean Engineering, NTU. And used the image processing techniques with edge detection and digitize to analysis the free surface elevation. In the Full-scale image, using LabView successfully developed multi-section image connection technique with edge detection. By measuring enlarge Y axis image to observe the physical phenomenon details when the wave passed over the submerged dike, at the same time, the digital free surface data could be totally analysis the wave phenomenon by using Matlab to develop 2DFFT and 1DMWT.
Multi-section Full-scale measure techniques by using high speed camera, it's better than the low sampling CCD camera and wave gages because of its higher sampling and space resolution. The enlarge Y axis error is less than 2 pixels at connecting surface, and almost no error at time. Otherwise, the propose method could decompose the waves of incident, reflect, even the free and bound wave of higher harmonics. By this method also useful to deal with the complex nonlinear harmonic waves interaction and had been good validation. Finally, this study focused on research the effects of generating higher harmonics waves by different width (Bx) of step obstacle.The point view of energy(amplitude) and energy flux(E*Cg) by determining the spatial distribution of energy flux(E*Cg) and take the result to parameter optimation. Setting a threshold of generated second harmonics wave by using incident wave Ursell number and introduced a parameter(Bx/λi)±n, n=0.09. And the viewpoint of energy flux, the results were obtained n=+0.39 and n=-0.32 at generating bound wave and free wave. In this research also bring up a simulation of math model to describe the relationship of spatial amplitude between first and second harmonics. At the simulation spatial domain, the curve decay rate of amplitude can't be neglect because the friction effects. At the last, we discussed the effects of reflect(Kr)、transmission(Kt) and energy dissipation(Kd) at Step1 and Step2 when waves propagate over a submerged. And our results were quite reliable and could be provided to numerical researchers to examine their models. | en |
dc.description.provenance | Made available in DSpace on 2021-06-16T13:27:41Z (GMT). No. of bitstreams: 1 ntu-102-D91525005-1.pdf: 6386348 bytes, checksum: 556b87b2249471fc7eb6b38723415558 (MD5) Previous issue date: 2013 | en |
dc.description.tableofcontents | 口試委員審定書 I
謝辭 II 中文摘要 III Abstract.IV 目錄 VI 圖目錄 IX 表目錄 XIII 符號說明 XIV 第一章 緒論 1 1.1研究目的 1 1.2文獻回顧 2 1.2.1波浪與沒水結構物交互作用 2 1.2.2波浪訊號分解方面 4 1.2.3國內近年相關研究 5 1.3研究內容 8 第二章 實驗設備、佈置與影像數位化 9 2.1實驗設備 9 2.1.1造波系統與水槽 9 2.1.2非干擾式光學量測系統 9 2.2實驗佈置 12 2.3 影像數位化 12 2.3.1 影像校正 12 2.3.2 影像連結與邊緣偵測 13 2.4 實驗條件與相關波浪參數計算 15 第三章 數據分析方法 18 3.1 數位化波高訊號分解(decomposition)流程 18 3.2二維快速傅立業轉換與移動短視窗傅立業轉換法 20 3.2.1 二維快速傅立業轉換原理(2DFFT) 20 3.2.2 2DFFT移動短時窗 28 3.3 1D Morlet小波法(1DMWT)原理 30 3.3.1複數型MWT介紹 30 3.3.2各諧和波中強迫波與自由波成分之分解 33 3.4反射率之量測 38 第四章 高階諧和波的生成 41 4.1 高階諧和波生成 41 4.1.1 空間振幅之分佈 41 4.1.2 堤上的a1min與a2max之最佳化參數 51 4.1.3 Region III的波浪成份 54 4.2 諧和波生成的界定 57 4.3 空間振幅分佈之模擬 62 第五章 能通量之空間分佈 68 5.1 小波法分解自由波與強迫波 68 5.1.1 Region I~III之小波法分析 70 5.1.2 過渡區(transient)內波長之演化 77 5.2 能通量分佈與最佳化參數 80 5.2.1 能通量之計算 80 5.2.2 自由波與強迫波能通量之最佳化參數 86 5.3 反射率、透射率及能量消散率討論 89 5.3.1 Region I之反射率比較 89 5.3.2 Step1與Step2之反射係數、透射係數與能量消散係數 93 第六章 結論與建議 100 6.1結論 100 6.2建議 101 參考文獻 103 附錄A Goda合成波分離法(兩點法) 106 作者簡歷 108 | |
dc.language.iso | zh-TW | |
dc.title | 波浪通過矩形潛堤:堤寬對諧和波生成影響之實驗研究 | zh_TW |
dc.title | Surface Waves Propagate over a Submerged Step : The Effect of the Width of Step on Harmonic Generation | en |
dc.type | Thesis | |
dc.date.schoolyear | 101-2 | |
dc.description.degree | 博士 | |
dc.contributor.oralexamcommittee | 林銘崇,蕭松山,蔡進發,林呈,楊智傑 | |
dc.subject.keyword | 2DFFT,1DMWT,高階諧和波,Ur.數,能量通率(E*Cg), | zh_TW |
dc.subject.keyword | 2DFFT,1DMWT,Higher harmonics,Ursell number,Energy flux, | en |
dc.relation.page | 108 | |
dc.rights.note | 有償授權 | |
dc.date.accepted | 2013-07-23 | |
dc.contributor.author-college | 工學院 | zh_TW |
dc.contributor.author-dept | 工程科學及海洋工程學研究所 | zh_TW |
顯示於系所單位: | 工程科學及海洋工程學系 |
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