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完整後設資料紀錄
DC 欄位 | 值 | 語言 |
---|---|---|
dc.contributor.advisor | 宋國士 | |
dc.contributor.author | Chiao Yang | en |
dc.contributor.author | 楊橋 | zh_TW |
dc.date.accessioned | 2021-06-16T03:39:24Z | - |
dc.date.available | 2015-03-16 | |
dc.date.copyright | 2015-03-16 | |
dc.date.issued | 2015 | |
dc.date.submitted | 2015-02-24 | |
dc.identifier.citation | 中文部分
1. 任國治,民83。由3.5仟赫聲納數位化信號探討聲波在海床表層沉積物中的衰減性質,國立臺灣大學理學院海洋研究所碩士論文。 2. 陳儀清、陳民本,民86。臺灣西南海域海床表層沈積構造與聲學特性圖集,國科會國防科技學術合作協調小組委託計畫研究成果。 3. 蔡明格,民100。臺灣東北海域反算底質音響參數分析研究,國立臺灣大學工學院工程科學及海洋工程學研究所碩士論文。 4. 黃偉克,民85。利用3.5仟赫聲納迴聲化訊號遙測海床表層沈積物特性可行性之探討,國立臺灣大學理學院海洋研究所碩士論文。 5. 林智偉,民100。利用聲納反射係數探討海床沉積物特性,國立中央大學地球物理研究所碩士論文。 6. 劉金源,民90。水中聲學:水聲系統之基本操作原理,國立編譯館。 7. 宋國士,民102。臺灣西岸中部海床軟硬程度分類調查,財團法人船舶暨海洋產業研發中心期中報告 英文部分 8. E. L. Hamilton, Reflection coefficients and bottom losses at normal incidence computed from Pacific sediment properties. Geophysics 35, 995-1004 (1970). 9. K. Davis, N. Slowey, I. Stender, H. Fiedler, W. Bryant, G. Fechner, Acoustic backscatter and sediment textural properties of inner shelf sands, northeastern Gulf of Mexico. Geo-Marine Letters 16, 273-278 (1996). 10. J. Bull, R. Quinn, J. Dix, Reflection Coefficient Calculation from Marine High Resolution Seismic Reflection (Chirp) Data and Application to an Archaeological Case Study. Marine Geophysical Researches 20, 1-11 (1998). 11. J. A. Goff, H. C. Olson, C. S. Duncan, Correlation of side-scan backscatter intensity with grain-size distribution of shelf sediments, New Jersey margin. Geo-Marine Letters 20, 43-49 (2000). 12. A. D. Sharke, APPLICATION OF CHIRP SONAR ACOUSTIC REFLECTION COEFFICIENT FOR SEA FLOOR SEDIMENT CLASSIFICATION:RESULTS FROM THE DELAWARE ESTUARY. The University of Delaware,(2007). 13. F. P. Shepard, Nomenclature based on sand-silt-clay ratios. Journal of Sedimentary Petrology 24,151-158,(1954). 14. K. A. Johannesson, R.B. Mitson, Fisheries acoustics: a practical manual for aquatic biomass estimation. FAO Fish. Tech Pap,240-249,(1983). 15. A. B. Baggeroer, Acoustic telemetry - An overview. Oceanic Engineering, IEEE Journal of 9, 229-235 (1984). 16. I. R. Stevenson, C. McCann, P. B. Runciman, An attenuation based sediment classification technique using chirp sub-bottom profiler data and laboratory acoustic analysis. Marine Geophysical Researches. 23, 277-298,(2002). 17. J. A. Goff, B. J. Kraft, L. A. Mayer, S. G. Schock, Seabed characterization on the New Jersey middle and outer shelf: correlatability and spatial variability of seafloor sediment properties, Marine Geology. 209, 147-172,(2004). | |
dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/54830 | - |
dc.description.abstract | 過去對於水域底質之判定多採用傳統岩芯取樣的方法,結果除沒有效率外,對區域的代表性也不佳。本次研究目的為測試使用聲波傳遞的方法,用來估算海床上和其下方淺層沉積物的反射係數值,進而判斷調查地方沉積物的顆粒大小分布。使用工具是連續變頻聲納(chirp sonar)系統,為EdgeTech公司1990年出產的Xstar系統,音鼓載具型號是SB-216S,作業使用頻段為2- 10kHz,工作地點在苗栗竹南外海。利用聲波反射能量來計算反射係數值,需考慮各介質中對能量的擴散、衰減等因素,研究中為了計算聲波在傳播過程中減少的能量,考慮了音束束寬傳播和聲波波長的效應關係,去求取反射係數解,這過程所得到的校正值和根據現場海床樣本的粒徑分布屬性,並利用Hamilton(1970)的實驗值尚稱吻合。本研究方法進一步用來計算海床次層的反射係數,用鑽孔資料做比對,結果顯示對海床下的聲波地層介面反射係數的估算偏差量,越往深處誤差可能會隨訊號強弱而改變。利用聲波去計算反射係數值,必須考量近場域壓力場測量值的代表性是否充分,或需建立一合理的聲場校正程序方能有效。參考測區附近的岩心資料對比本研究得出的各層反射係數值,驗證結果符合實際的沉積物淺層分佈的情形。 | zh_TW |
dc.description.abstract | In order to know the physical properties of seabed sediments, people traditionally adopted to practical grabbing the samples of seabed sediments and analyzed it directly. But there are dozens of drawbacks like inefficient for vast area and unrepresentative for region as a whole. This study aimed at looking for a method that is more efficient to acquire the reflection coefficients of seabed sediments and further to each interface of sediment layers beneath. The tool used is the geological chirp sonar called which the Xstar system composed of a transducer vehicle SB-216S produced by the EdgeTech in 1990. The survey was conducted in Chu-Nai offshore area and operated bandwidth in 2-10kHz. Draw upon acoustic reflection power to calculate the reflection coefficients that would contemplate on the factors of energy spreading and attenuation when acoustic waves transport the downwards in different mediums. In order to estimate the amount of energy loss, to precisely find the values of reflection coefficient, the spreading effect on beamwidth as well as the Fresnel zone effect on reflected energy have been considered. The calibration ratio is therefore obtained, and the value is compatible with the study adopted local seabed sediment sample to amend the reflection coefficient according to conclusion of Hamiltion(1970). The method we study is feasible to calculate reflection coefficient on seabed layers further beneath, and the result would illustrate more deviated in the deep when the singal/noise ratio is significantly decreased. If we utilized acoustic power to calculate reflection coefficient, we shall first considering the representative of Near-field pressure measurement is adequate or not. Or we have to set up a rationally calibration process of acoustic field. At last, we compare the reflection coefficients of 3 acoustic interfaces in shallow layers beneath seabed with the core drilling data nearby to attest what we calculate is in keeping with reality. | en |
dc.description.provenance | Made available in DSpace on 2021-06-16T03:39:24Z (GMT). No. of bitstreams: 1 ntu-104-R01241312-1.pdf: 2247155 bytes, checksum: d6780d1bbcf88f15a5b4046f66060519 (MD5) Previous issue date: 2015 | en |
dc.description.tableofcontents | 誌謝 I
中文摘要 II 英文摘要 III 目錄 V 圖目錄 VII 表目錄 IX 第一章 緒論 1 1.1前言 1 1.2研究動機與目的 2 1.3文獻回顧 3 1.4預期貢獻 5 1.5研究大綱 6 第二章 研究儀器概述與原理 7 2.1研究儀器介紹 7 2.1.1定位儀器 8 2.1.2連續變頻聲納之介紹 9 2.1.3海床沉積物採樣儀器 11 2.2 儀器運作原理概述 12 2.2.1水下震測原理 12 2.2.2連續變頻聲納之運作原理 13 2.2.3Xstar 系統 15 2.3分貝、聲強、聲壓 16 2.4聲波能量隨傳播距離改變之關係 18 第三章 研究方法與原理 21 3.1反射係數 21 3.2反射係數的求法 22 第四章 結果 37 4.1竹南外海海床地層資料的收集 37 4.2淺層主要沉積界面層反射係數的估算 38 第五章 結論 47 參考文獻 48 | |
dc.language.iso | zh-TW | |
dc.title | 利用連續變頻聲納對海底沉積物之淺層反射係數的估算研究 | zh_TW |
dc.title | A Study for Estimating the Reflection Coefficients of the Layering Sediments Using Chirp Sonar | en |
dc.type | Thesis | |
dc.date.schoolyear | 103-1 | |
dc.description.degree | 碩士 | |
dc.contributor.oralexamcommittee | 黃千芬,湛翔智 | |
dc.subject.keyword | 連續變頻聲納,反射係數,沉積物分類,傳播損失, | zh_TW |
dc.subject.keyword | chirp sonar,reflection coefficient,sediment classification,transmission loss, | en |
dc.relation.page | 49 | |
dc.rights.note | 有償授權 | |
dc.date.accepted | 2015-02-24 | |
dc.contributor.author-college | 理學院 | zh_TW |
dc.contributor.author-dept | 海洋研究所 | zh_TW |
顯示於系所單位: | 海洋研究所 |
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