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完整後設資料紀錄
DC 欄位 | 值 | 語言 |
---|---|---|
dc.contributor.advisor | 陳琪芳 | |
dc.contributor.author | Chun-Ming Yang | en |
dc.contributor.author | 楊純明 | zh_TW |
dc.date.accessioned | 2021-05-19T17:56:05Z | - |
dc.date.available | 2026-08-17 | |
dc.date.available | 2021-05-19T17:56:05Z | - |
dc.date.copyright | 2016-08-25 | |
dc.date.issued | 2016 | |
dc.date.submitted | 2016-08-19 | |
dc.identifier.citation | 參考文獻
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dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/7854 | - |
dc.description.abstract | 台灣西南方-北南海陸波上,有許多因海洋內波所造成的特殊地形-沙丘。沙丘分布在160公尺至600公尺水深,發現其振幅最大可達16公尺,導致此海域的水下音傳會受到沙丘地形影響,而產生三維擾動效應。本文將使用拋物線方程式(parabolic equation)為基礎的數值模式進行模擬,數值模式可分為二維拋物線方程式(RAM)以及可計算三維拋物線方程式(FOR3D)的模式進行模擬計算,而模擬結果是否正確取決於許多因素,其中初始場佔有很大的影響力。根據過去的模擬結果發現RAM所使用的初使場(self starter)會出現過分初始化的現象而影響模擬結果,且為確保模擬結果正確需找出符合實驗聲源的初始條件,故本文將針對初始場的問題進行探討,並使用合適的初始場模擬2014年於此海域所獲得相關實驗資訊進行聲學模擬比對,分別以二維及三維傳播模式探討,分析南海沙丘對水下音傳所造成的三維擾動效應。 | zh_TW |
dc.description.abstract | There are many underwater sand dunes caused by the internal wave located in the depth of 160 meters to 600 meters in northern South China Sea. The largest amplitude of these sand dunes is about 16m. Underwater acoustic transmission is affected by this topographic feature, and also has three dimensional effects. In this research the 2-D and 3-D underwater acoustic propagation models (RAM and FOR3D respectively), are used to simulate acoustic propagation in the region. There is starter issue to be resolved for the high-impedance, low-loss ocean bottom of the region. RAM with self-starter is overly initialized, thus the initial field is produced to match with the source beam-pattern. A tunable Gaussian starter is then used to avoid over initialization, which is a proper starter for the moored source. The acoustic field received at VLA emitted from the moored source is simulated with the proper starter. Results show temporal variations with respect to that of water column, and three dimensional effects over sand dunes. | en |
dc.description.provenance | Made available in DSpace on 2021-05-19T17:56:05Z (GMT). No. of bitstreams: 1 ntu-105-R03525010-1.pdf: 13015274 bytes, checksum: 8c9dee9af7572e347962fd8e633015f4 (MD5) Previous issue date: 2016 | en |
dc.description.tableofcontents | 目錄
誌謝 i 中文摘要 ii ABSTRACT iii 目錄 iv 符號目錄 vi 圖目錄 vii 表目錄 xii 第一章 緒論 1 1.1 前言 1 1.2研究動機及目的 2 1.3 文獻回顧 2 1.4論文架構 5 第二章 2014年北南海沙丘實驗 6 2.1 實驗介紹 6 2.1.1 實驗目的 6 2.1.2 實驗規劃 6 2.2實驗資料 14 第三章 研究方法 20 3.1 二維拋物線方程式 20 3.2 Self-Start 22 3.3 三維效應分類 23 3.4 Lee-Saad-Schultz (LSS)數學模式 24 第四章 模式參數設定 27 4.1 初始場修正 27 4.1.1 FOR3D with Standard Gaussian Starter 27 4.1.2 RAM with Standard Gaussian Starter 28 4.1.3 符合聲源之初始場 40 4.2 探討FOR3D角度限制 45 4.3 合適距離變化量 49 第五章 模擬結果 53 5.1 地形比較 53 5.2聲速隨時間變化於無沙丘地形 57 5.3聲速隨時間變化於沙丘地形 58 5.4 三維音傳模擬 61 第六章 結論與未來工作 66 6.1 結論 66 6.2 未來工作 67 參考文獻 72 附錄A 聲速隨時間變化於沙丘地形(每15分鐘) 74 附錄B TUDAS-32各麥克風於2014年6月9日隨時間變化的音傳損耗 86 附錄C RAM之程式碼 102 附錄D ram.in格式範例 106 | |
dc.language.iso | zh-TW | |
dc.title | 南海沙丘地形之水下音傳研究 | zh_TW |
dc.title | Studying Sound Propagation over South China Sea Upper-slope Sand Dunes Using Parabolic Equation Models | en |
dc.type | Thesis | |
dc.date.schoolyear | 104-2 | |
dc.description.degree | 碩士 | |
dc.contributor.oralexamcommittee | 王昭男,趙正生(Ching-Sang Chiu),邱永盛 | |
dc.subject.keyword | 南海沙丘,拋物線方程式,RAM,FOR3D,初始場, | zh_TW |
dc.subject.keyword | underwater sand dune,parabolic equation,RAM,FOR3D,initial field, | en |
dc.relation.page | 106 | |
dc.identifier.doi | 10.6342/NTU201600177 | |
dc.rights.note | 同意授權(全球公開) | |
dc.date.accepted | 2016-08-20 | |
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 |
dc.date.embargo-lift | 2026-08-17 | - |
顯示於系所單位: | 工程科學及海洋工程學系 |
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