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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 | Ai-Tzu Liu | en |
dc.contributor.author | 劉愛慈 | zh_TW |
dc.date.accessioned | 2021-06-15T07:04:42Z | - |
dc.date.available | 2011-01-17 | |
dc.date.copyright | 2011-01-17 | |
dc.date.issued | 2010 | |
dc.date.submitted | 2010-12-18 | |
dc.identifier.citation | 1. Blenkinsopp, C. E., Chaplin, J. R. 2008. “The effect of relative crest submergence on wave breaking over submerged slopes,” Coastal Eng. Vol. 55, pp. 967-974.
2. Bullock, G. N., Obhrai, C., Peregrine, D. H. and Bredmose, H. 2007. “Violent breaking wave impact. Part 1: Results from large-scale regular wave tests on vertical and sloping walls.” Coastal Eng. Vol. 56, pp. 733-746. 3. Capart, H., Young, D. L. and Zech, Y. 2002. “Voronoï imaging methods for the measurement of granular flows.” Exp Fluids Vol. 32, pp. 121-135. 4. Huang, Z-C., Hsiao, S-C., Hwung, H-H. and Chang, K-A. 2009. “Turbulence and energy dissipations of surf-zone spilling breakers.” Coastal Eng. Vol. 56, pp. 733-746. 5. Kirkgöz, M. S. 1978. “Breaking waves: their action on slopes and impact on vertical seawalls.” Thesis presented to the University of Liverpool, U. K., in partial fulfillment of the requirements for the degree of Doctor of Philosophy. 6. Kirkgöz, M. S. 1982. “Shock pressure of breaking waves on vertical walls.” J. Waterway Port Coastal & Ocean Div., A.S.C.E. Vol. 108, pp. 81-95. 7. Kirkgöz, M. S. 1991. “Impact pressure of breaking waves on vertical and sloping walls.” Ocean Eng. Vol. 18, pp. 45-59. 8. Kirkgöz, M. S. 1995. “Breaking wave impact on vertical and sloping coastal structures.” Ocean Eng. Vol. 22, pp. 35-48. 9. Melville, W. K., Veron, F., White, C.J. 2002. “The velocity field under breaking waves: coherent structures and turbulence.” J. Fluid Mech. Vol. 454, pp. 203–233. 10. Perlin, M., He, J. 1996. “An experimental study of deep water plunging breakers.” Phys Fluids Vol.8, pp. 2365-2374. 11. Ryu, Y., Chang, K-A. and Mercier, R. 2007. “Runup and water velocities due to breaking wave impinging and overtopping.” Exp Fluids Vol. 43, pp. 555-567. 12. Tsai, C-P., Chen, H-B., Hwung, H-H. and Huang, M-J. 2005. “Examination of empirical formulas for wave shoaling and breaking on steep slopes.” Ocean Eng. Vol. 32, pp. 469-483. 13. 鄔振聲,1998。「淺化碎波在直立堤上之衝擊波壓量測分析」,國立臺灣大學造船及海洋工程研究所碩士論文。 14. 林明弘,1999。「淺化碎波作用在傾斜壁上之衝擊波壓量測與分析」,國立臺灣大學造船及海洋工程研究所碩士論文。 15. 趙偉廷,2009。「深水碎波衝擊直立壁之流場分析研究」,國立臺灣大學工程科學與海洋工程學研究所碩士論文。 | |
dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/48614 | - |
dc.description.abstract | 本研究採用坡度為1/10的堤前底床,使波浪經淺化後,形成完美碎波,分別拍擊在傾斜角度為0°、10°、20°、30°之傾斜壁,並使用粒子影像測速儀(P.I.V.),觀測碎波撞擊前後堤壁附近的流場變化,其中包含速度向量場與渦度場之分析,以及撞擊瞬間堤壁所受波壓之估算。堤壁所受波壓分布之計算則是根據實驗所得的瞬時速度場,配合控制體積與Stokes二階波方程式而得。從結果可看出,隨著堤壁傾斜角度的增加,波浪撞擊堤壁後有較多向右的空間,速度變化較不劇烈,流體從堤壁上滑落的情況與波形的變化也漸趨緩和。碎波衝擊堤壁,下滑後會產生一個明顯的渦旋,此現象會隨著堤壁傾斜角度增加,變得較不顯著。而堤壁附近的紊流,也會隨著傾斜角度的增加而減少。本研究並針對波壓估算模式的準確性進行驗證,發現時間觀測尺度對估算模式之準確度有很大的影響。在撞擊瞬間,在靠近堤壁1 cm內,壓力急遽上升,在距離堤壁3~5 cm處,壓力在垂直堤壁方向變化非常小,類似以均勻流方式入射堤壁。以P/γH、y/d與PH/γhL、y/H兩種參數做無因次壓力分析時,發現四種堤壁波壓分布差不多,皆看不出傾斜角度對波壓的影響。 | zh_TW |
dc.description.abstract | In this study the slope of the approaching bed in front of the wall is 1/10. The impacts on the different sloping walls of 0°, 10°, 20°, and 30° by the perfect breaking waves after shoaling are studied, by using particle image velocimetry (P.I.V.) to observe the flow field variations near the walls right before and after the impact of the breaking waves on the walls, from which the velocity fields and vortex fields are analyzed and the wave pressures on the walls right on the instant of impact are evaluated. The distributions of the wave pressures on the walls are derived according to the instant velocity fields obtained from the experiments along with the control volume concept and the second-order Stokes wave equation.
It is observed from the results that, with the increase of the oblique angles, there is more space toward the right hand side after waves impacting the wall; therefore, the variation of the velocity is not so severe, in addition, the fluid sliding down from the walls and the changes of the wave shapes are both mitigated. After impact of the breaking wave on the wall, there is a vortex induced by the sliding of the fluid. This phenomenon is less significant with the increase of the oblique angle of the wall. While the turbulence near the wall is mitigated with the increase of the oblique angle. In addition, the accuracy of the model for the wave pressure evaluation has been verified. It is found that the observation time scale is significant on the accuracy of the evaluation. Right on the instant of impact, within the proximity of 1 cm to the wall, the pressure increases rapidly; however, away from the wall 3 to 5 cm, the pressure normal to the wall has no much change, similar to the uniform flow impinging on the wall. From the non-dimensional pressure analyses with (P/γH,y/d) and (PH/γhL,y/H) two parameters, the wave pressure distributions for the four different oblique walls are no much difference; therefore, there is no influence on the wave pressure due to the oblique angles. | en |
dc.description.provenance | Made available in DSpace on 2021-06-15T07:04:42Z (GMT). No. of bitstreams: 1 ntu-99-R97525008-1.pdf: 7219171 bytes, checksum: c86d1a97f0e72aac530074588beb10b0 (MD5) Previous issue date: 2010 | en |
dc.description.tableofcontents | 口試委員審定書……………………………………………….i
誌謝……………………………………………………………ii 中文摘要………………………………………………….…..iii 英文摘要………………………………………………………iv 目錄……………………………………………………………vi 圖目錄………………………………………………………..viii 表目錄………………………………………………………….x 第一章 導論……………………………………………1 1-1 研究目的 ……………………………………………………………………1 1-2 文獻回顧 ……………………………………………………………………2 1-3 研究內容 ……………………………………………………………………7 第二章 實驗佈置與方法………………………………8 2-1 實驗設備 ……………………………………………………………………8 2-2 實驗佈置… …………………………………………………………………10 2-3 實驗條件與方法… …………………………………………………………13 2-4碎波重複性驗證 ……………………………………………………………16 第三章 影像處理及分析………………………………21 3-1 前置工作……………………………………………………………………21 3-2 影像質點辨識………………………………………………………………22 3-3 質點位移判定方法與驗證…………………………………………………23 3-4 流場分析……………………………………………………………………26 3-5 渦度場分析…………………………………………………………………28 3-6堤壁壓力估算模式… ………………………………………………………29 3-6-1直立壁壓力估算模式 ……………………………………………………29 3-6-2傾斜壁壓力估算模式 ……………………………………………………35 3-6-3撞擊瞬間之分析方法 ……………………………………………………38 第四章 實驗結果與討論……………………………40 4-1 速度向量場 …………………………………………………………………42 4-2 渦度場 ………………………………………………………………………50 4-3 直立壁及傾斜壁之波壓分布 ………………………………………………58 4-3-1 壓力估算模式之驗證 … …………………………………………………58 4-3-2 撞擊瞬間壓差分布與堤壁距離之探討 … ………………………………62 4-3-3 堤壁所受波壓與無因次分析結果 … ……………………………………66 第五章 結論…………………………………………74 參考文獻 ……………………………………………76 | |
dc.language.iso | zh-TW | |
dc.title | 淺化碎波衝擊直立壁及傾斜壁之流場量測與分析 | zh_TW |
dc.title | Flow Field Measurements of Shoaling Breaking Wave Impacts on Vertical and Sloping Walls | en |
dc.type | Thesis | |
dc.date.schoolyear | 99-1 | |
dc.description.degree | 碩士 | |
dc.contributor.oralexamcommittee | 林銘崇,許文翰,江允智,許朝敏 | |
dc.subject.keyword | 粒子影像測速儀,傾斜壁,壓力場估算,速度場,渦旋場,淺化碎波, | zh_TW |
dc.subject.keyword | P.I.V.,pressure field,velocity filed,vorticity field,sloping wall,shoaling breaking wave, | en |
dc.relation.page | 77 | |
dc.rights.note | 有償授權 | |
dc.date.accepted | 2010-12-20 | |
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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