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Deep Ocean Ambient Noise Analysis an...

Farrokhrooz, Mehdi.

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Deep Ocean Ambient Noise Analysis and Modeling for SPICEX.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Deep Ocean Ambient Noise Analysis and Modeling for SPICEX./
作者:	Farrokhrooz, Mehdi.
出版者:	Ann Arbor : ProQuest Dissertations & Theses, : 2017,
面頁冊數:	175 p.
附註:	Source: Dissertation Abstracts International, Volume: 79-01(E), Section: B.
Contained By:	Dissertation Abstracts International79-01B(E).
標題:	Acoustics. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=10279759
ISBN:	9780355302592

Deep Ocean Ambient Noise Analysis and Modeling for SPICEX.
Farrokhrooz, Mehdi.

Deep Ocean Ambient Noise Analysis and Modeling for SPICEX. - Ann Arbor : ProQuest Dissertations & Theses, 2017 - 175 p.

Source: Dissertation Abstracts International, Volume: 79-01(E), Section: B.

Thesis (Ph.D.)--George Mason University, 2017.

This item is not available from ProQuest Dissertations & Theses.

Shipping and wind are the dominant sources of ocean noise in the frequency band between 20 and 500 Hz. This dissertation analyzes noise in that band using data from the SPICEX experiment, which took place in the North Pacific in 2004-2005. The ambient noise analysis in SPICEX includes several key results. First, the noise levels in 2004-05 at 50 Hz measured in SPICEX had not increased relative to levels measured by Morris [J. Acoust. Soc. Am. 64, 581--590 (1978)] at a nearby North Pacific site three decades earlier, but rather were comparable to those levels. Second, at 50 Hz the noise below the conjugate depth decreases at a rate of -9.9 dB/km, which is similar to the rate measured by Morris and much less than the rate measured by Gaul et al. [IEEE J. Ocean. Eng. 32, 497-512 (2007)] for the CHURCH OPAL experiment. Third, the ambient noise in SPICEX shows a seasonal pattern over the year-long time series of the measurements. Inspired by the results of SPICEX noise analysis, this dissertation shows that the internal wave scattering can be an effective mechanism to transfer the near-surface generated noise into the SOund Fixing And Ranging (SOFAR) channel. Due to large number of sources in open ocean, the effect of internal wave scattering in coupling the near-surface generated noise into SOFAR channel is comparable with shallowing the SOFAR channel in high latitudes. This dissertation simulates local and distant wind noise and adds them to the distant shipping noise and compares the total simulated noise with SPICEX. This comparison shows that the distant wind plays an important role in generating the low frequency ambient noise and explaining its seasonal variations. Finally, this dissertation investigates the effect of array tilt on the measured ambient noise as a source of observation error.

ISBN: 9780355302592Subjects--Topical Terms:

879105
Acoustics.

Deep Ocean Ambient Noise Analysis and Modeling for SPICEX.
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