東華大學圖書館 |

語系: 繁體中文

說明(常見問題)

回圖書館首頁

手機版館藏查詢

登入

回首頁

切換: 標籤 | MARC模式 | ISBD

Mapping The Ocean Sound Speed at The...

Sukpholtham, Sitthichat.

FindBook

Google Book

Amazon

博客來

Mapping The Ocean Sound Speed at The Aloha Cabled Observatory Using Reliable Acoustic Path Tomography.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Mapping The Ocean Sound Speed at The Aloha Cabled Observatory Using Reliable Acoustic Path Tomography./
作者:	Sukpholtham, Sitthichat.
出版者:	Ann Arbor : ProQuest Dissertations & Theses, : 2019,
面頁冊數:	112 p.
附註:	Source: Masters Abstracts International, Volume: 81-03.
Contained By:	Masters Abstracts International81-03.
標題:	Ocean engineering. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=13882068
ISBN:	9781085638463

Mapping The Ocean Sound Speed at The Aloha Cabled Observatory Using Reliable Acoustic Path Tomography.
Sukpholtham, Sitthichat.

Mapping The Ocean Sound Speed at The Aloha Cabled Observatory Using Reliable Acoustic Path Tomography. - Ann Arbor : ProQuest Dissertations & Theses, 2019 - 112 p.

Source: Masters Abstracts International, Volume: 81-03.

Thesis (M.S.)--University of Hawai'i at Manoa, 2019.

This item must not be sold to any third party vendors.

We have investigated the feasibility of Reliable Acoustic Path (RAP) tomography using a mobile ship platform (R/V Kilo Moana) and the existing acoustic infrastructure at the ALOHA Cabled Observatory (ACO). Travel times of acoustic signals traveling along direct paths between the shipboard acoustic source and the bottom-mounted hydrophones were measured. Perturbations of the travel times relative to predicted travel times were obtained, based on the CTD cast closest in time to the experiment date. Stochastic linear inversion was employed to solve for sound speed perturbation fields using the travel time perturbation measurements. This provides a spatially-dependent sound speed field (a proxy of temperature) over a 60-km-diameter "teacup" volume of the ocean. This project is a continuation of previous RAP work which laid the foundation for the work described herein. The preliminary results from three RAP cruises since June 2017 showed non-physical range-dependence and ship-dependence of the travel time perturbations. Improvements to the ray tracing and corrections to data processing were made to solve these issues. This resulted in a reasonable range of travel time perturbation variability which yielded realistic sound speed spatial variability from the inversion process. The sensitivity of the travel time perturbation to the third empirical mode of the vertical sound speed perturbation structure was found to be higher than expected. The vertically-averaged sound speed was used to represent the model parameters as it had the overall highest resolution and corresponding low estimated error. These results demonstrate the practicality and utility of the RAP tomography at the ACO and general applicability for other observatories and seafloor geodesy.

ISBN: 9781085638463Subjects--Topical Terms:

660731
Ocean engineering.
Subjects--Index Terms:

Ocean Acoustics

Mapping The Ocean Sound Speed at The Aloha Cabled Observatory Using Reliable Acoustic Path Tomography.
LDR:02921nmm a2200361 4500 001 2268835
005 20200824100405.5
008 220629s2019 ||||||||||||||||| ||eng d
020 $a 9781085638463
035 $a (MiAaPQ)AAI13882068
035 $a AAI13882068
040 $a MiAaPQ $c MiAaPQ
100 1 $a Sukpholtham, Sitthichat. $3 3546134
245 1 0 $a Mapping The Ocean Sound Speed at The Aloha Cabled Observatory Using Reliable Acoustic Path Tomography.
260 1 $a Ann Arbor : $b ProQuest Dissertations & Theses, $c 2019
300 $a 112 p.
500 $a Source: Masters Abstracts International, Volume: 81-03.
500 $a Advisor: Howe, Bruce.
502 $a Thesis (M.S.)--University of Hawai'i at Manoa, 2019.
506 $a This item must not be sold to any third party vendors.
520 $a We have investigated the feasibility of Reliable Acoustic Path (RAP) tomography using a mobile ship platform (R/V Kilo Moana) and the existing acoustic infrastructure at the ALOHA Cabled Observatory (ACO). Travel times of acoustic signals traveling along direct paths between the shipboard acoustic source and the bottom-mounted hydrophones were measured. Perturbations of the travel times relative to predicted travel times were obtained, based on the CTD cast closest in time to the experiment date. Stochastic linear inversion was employed to solve for sound speed perturbation fields using the travel time perturbation measurements. This provides a spatially-dependent sound speed field (a proxy of temperature) over a 60-km-diameter "teacup" volume of the ocean. This project is a continuation of previous RAP work which laid the foundation for the work described herein. The preliminary results from three RAP cruises since June 2017 showed non-physical range-dependence and ship-dependence of the travel time perturbations. Improvements to the ray tracing and corrections to data processing were made to solve these issues. This resulted in a reasonable range of travel time perturbation variability which yielded realistic sound speed spatial variability from the inversion process. The sensitivity of the travel time perturbation to the third empirical mode of the vertical sound speed perturbation structure was found to be higher than expected. The vertically-averaged sound speed was used to represent the model parameters as it had the overall highest resolution and corresponding low estimated error. These results demonstrate the practicality and utility of the RAP tomography at the ACO and general applicability for other observatories and seafloor geodesy.
590 $a School code: 0085.
650 4 $a Ocean engineering. $3 660731
650 4 $a Physical oceanography. $3 3168433
650 4 $a Acoustics. $3 879105
653 $a Ocean Acoustics
653 $a Ocean Acoustic Tomography
653 $a Ocean observatory
653 $a Physical Oceanography
690 $a 0547
690 $a 0415
690 $a 0986
710 2 $a University of Hawai'i at Manoa. $b Ocean & Resources Engineering. $3 3546135
773 0 $t Masters Abstracts International $g 81-03.
790 $a 0085
791 $a M.S.
792 $a 2019
793 $a English
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=13882068