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| DC 欄位 | 值 | 語言 |
|---|---|---|
| dc.contributor.advisor | 柯彥廷 | zh_TW |
| dc.contributor.advisor | Yen-Ting Ko | en |
| dc.contributor.author | 何昆錡 | zh_TW |
| dc.contributor.author | Kun-Chi Ho | en |
| dc.date.accessioned | 2024-08-16T16:56:38Z | - |
| dc.date.available | 2024-08-17 | - |
| dc.date.copyright | 2024-08-16 | - |
| dc.date.issued | 2024 | - |
| dc.date.submitted | 2024-08-11 | - |
| dc.identifier.citation | Alashloo, S. M., Ghosh, D. P., Shahbazi, A., Hermana, M., & Ismail, W. W. (2016). Enhancing Seismic Imaging of Deep Structures Using Anelliptic VTI Traveltimes. In International Petroleum Technology Conference. IPTC.
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| dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/94595 | - |
| dc.description.abstract | 亞重力波是一種海洋重力波，週期較長，範圍從20到300秒，其形成機制是來自於風場動力學、海浪傳播、海岸地形、海床地形和各種波過程之間複雜的非線性相互作用。在這項研究當中，我們應用環境噪訊干涉法分析了在太平洋收集為期十年的Deep-ocean Assessment and Reporting of Tsunami (DART)資料，得到了對應於亞重力波週期的經驗格林函數。經驗格林函數所展示的傳遞行為與理論波的色散現象一致。功率譜密度和頻譜圖分析揭示了北太平洋和東南太平洋站點能量的季節性變化，前者在冬季達到高峰，後者則在夏季達到高峰，與WAVEWATCH III中的亞重力波觀測相似。我們結合Fast Marching Method (FMM)的波傳路徑，徹底探索了亞重力波強度和傳遞方向的季節變化，目的是建立與氣候變遷的潛在的聯繫，並辨認亞重力波的能量來源。我們的結果顯示，在冬季盛行西風加劇的時期，氣旋活動主要是亞重力波的能量來源。我們觀察到亞重力波由西向東傳遞，與以阿留申群島為中心的氣旋活動移動路徑一致。相反地，當盛行西風減弱時，無論在冬季還是夏季，沿岸反射都將成為亞重力波的主要能量來源。 | zh_TW |
| dc.description.abstract | Infra-gravity waves (IGWs), characterized by gravity waves with longer periods ranging from 20 to 300 seconds, originate from the intricate interplay of nonlinear interactions involving wind dynamics, wave dispersion, coastal features, seabed topography, and various wave processes. In this study, we applied ambient noise interferometry to analyze cross-correlation functions (CCFs) derived from a 10-year dataset collected by the Deep-ocean Assessment and Reporting of Tsunami (DART) system in the Pacific Ocean, yielding empirical Green's functions (EGFs) corresponding to IGWs periods. The EGFs demonstrated notable propagating behavior, aligning with empirical wave dispersion relationships. Power Spectral Density (PSD) and spectrogram analysis unveiled seasonal patterns in North and Southeast Pacific Ocean stations, with winter intensity peaking in the former and summer in the latter, resembling IGWs observations from WAVEWATCH III. We combined the ray path from Fast Marching Method (FMM) to thoroughly explore the seasonal variation of IGWs in intensity and propagation direction, aiming to establish potential links to climate changes and to identify the sources of IGWs. Our results reveal that during periods of heightened winter Westerlies, storm activity predominantly fuels the source energy of IGWs. This inference is supported by the west-to-east propagation direction of IGWs along the Aleutian Islands, aligning with the movement of storms. Conversely, when Westerlies weaken, whether in winter or summer, shoreline reflection emerges as the primary energy source for IGWs. | en |
| dc.description.provenance | Submitted by admin ntu (admin@lib.ntu.edu.tw) on 2024-08-16T16:56:38Z No. of bitstreams: 0 | en |
| dc.description.provenance | Made available in DSpace on 2024-08-16T16:56:38Z (GMT). No. of bitstreams: 0 | en |
| dc.description.tableofcontents | 口試委員會審定書 i
誌謝 ii 摘要 iii Abstract iv 目次 v 圖次 viii 表次 xiv 第一章 緒論 1 1.1 引言 1 1.2 環境噪訊與地震干涉法 2 1.2.1 環境噪訊 2 1.2.2 環境噪訊干涉法 3 1.3 波浪 4 1.3.1 波浪的性質 4 1.3.2 線性重力波理論與頻散現象 5 1.4 亞重力波 7 1.4.1 亞重力波概述 7 1.4.2 亞重力波的生成機制 7 1.4.3 亞重力波的觀測 8 1.5 海嘯波 11 1.5.1 海嘯波概述 11 1.5.2 歷史上的海嘯 13 1.5.3 海嘯預警系統 14 1.6 研究動機與目標 17 第二章 研究方法 18 2.1 頻譜分析 18 2.1.1 功率譜密度 18 2.1.2 時頻分析 20 2.2 互相關函數與經驗格林函數 23 2.3 環境噪訊互相關 25 2.4 快速行進算法 29 2.5 康奈爾多重網格耦合海嘯模型 31 第三章 資料處理與分析 33 3.1 資料來源與處理流程 33 3.2 資料前處理與頻譜分析 34 3.3 MSNoise 39 3.4 資料正規化 40 3.5 互相關函數 43 3.6 堆疊時間長度與穩定性 45 第四章 結果與討論 47 4.1 亞重力波之傳遞特性 47 4.2 亞重力波與海嘯預警系統 51 4.3 亞重力波季節性變化 58 第五章 結論 66 參考文獻 68 附錄 84 A1 本研究測站資料時間間隔統計 84 A2 本研究測站之時序資料 85 A3 本研究測站之時頻圖 100 A4 本研究測站之波傳路徑 115 | - |
| dc.language.iso | zh_TW | - |
| dc.title | 利用環境噪訊干涉法擷取太平洋亞重力波之經驗格林函數 | zh_TW |
| dc.title | Empirical Green's Functions Retrieval of Infra-gravity Waves in the Pacific Ocean via Ambient Noise Interferometry | en |
| dc.type | Thesis | - |
| dc.date.schoolyear | 112-2 | - |
| dc.description.degree | 碩士 | - |
| dc.contributor.oralexamcommittee | 黃信樺;洪淑蕙;陳映年 | zh_TW |
| dc.contributor.oralexamcommittee | Hsin-Hua Huang;Shu-Huei Hung;Ying-Nien Chen | en |
| dc.subject.keyword | 環境噪訊干涉法,經驗格林函數,亞重力波,季節變化,海嘯, | zh_TW |
| dc.subject.keyword | Ambient noise interferometry,Empirical Green’s function,Infra-gravity waves,Seasonal variations,Tsunami, | en |
| dc.relation.page | 129 | - |
| dc.identifier.doi | 10.6342/NTU202403669 | - |
| dc.rights.note | 同意授權(全球公開) | - |
| dc.date.accepted | 2024-08-13 | - |
| dc.contributor.author-college | 理學院 | - |
| dc.contributor.author-dept | 海洋研究所 | - |
| 顯示於系所單位： | 海洋研究所 | |
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