東華大學圖書館 |

Language: English

Help

回圖書館首頁

手機版館藏查詢

Back

Switch To: Labeled | MARC Mode | ISBD

Long-term ambient noise statistics i...

University of New Orleans.

Linked to FindBook

Google Book

Amazon

博客來

Long-term ambient noise statistics in the Gulf of Mexico.

Record Type:	Language materials, printed : Monograph/item
Title/Author:	Long-term ambient noise statistics in the Gulf of Mexico./
Author:	Snyder, Mark Alan.
Description:	161 p.
Notes:	Source: Dissertation Abstracts International, Volume: 68-12, Section: B, page: 8074.
Contained By:	Dissertation Abstracts International68-12B.
Subject:	Engineering, Marine and Ocean. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3292304
ISBN:	9780549352853

Long-term ambient noise statistics in the Gulf of Mexico.
Snyder, Mark Alan.

Long-term ambient noise statistics in the Gulf of Mexico. - 161 p.

Source: Dissertation Abstracts International, Volume: 68-12, Section: B, page: 8074.

Thesis (Ph.D.)--University of New Orleans, 2007.

Long-term omni-directional ambient noise was collected at several sites in the Gulf of Mexico during 2004 and 2005. The Naval Oceanographic Office deployed bottom moored Environmental Acoustic Recording System (EARS) buoys approximately 159 nautical miles south of Panama City, Florida, in water depths of 3200 meters. The hydrophone of each buoy was 265 meters above the bottom. The data duration ranged from 10-14 months. The buoys were located near a major shipping lane, with an estimated 1.5 to 4.5 ships per day passing nearby. The data were sampled at 2500 Hz and have a bandwidth of 10-1000 Hz. Data are processed in eight 1/3-octave frequency bands, centered from 25 to 950 Hz, and monthly values of the following statistical quantities are computed from the resulting eight time series of noise spectral level: mean, median, standard deviation, skewness, kurtosis and coherence time.

ISBN: 9780549352853Subjects--Topical Terms:

1019064
Engineering, Marine and Ocean.

Long-term ambient noise statistics in the Gulf of Mexico.
LDR:03481nam 2200301 a 45 001 852948
005 20100701
008 100701s2007 ||||||||||||||||| ||eng d
020 $a 9780549352853
035 $a (UMI)AAI3292304
035 $a AAI3292304
040 $a UMI $c UMI
100 1 $a Snyder, Mark Alan. $3 1019085
245 1 0 $a Long-term ambient noise statistics in the Gulf of Mexico.
300 $a 161 p.
500 $a Source: Dissertation Abstracts International, Volume: 68-12, Section: B, page: 8074.
502 $a Thesis (Ph.D.)--University of New Orleans, 2007.
520 $a Long-term omni-directional ambient noise was collected at several sites in the Gulf of Mexico during 2004 and 2005. The Naval Oceanographic Office deployed bottom moored Environmental Acoustic Recording System (EARS) buoys approximately 159 nautical miles south of Panama City, Florida, in water depths of 3200 meters. The hydrophone of each buoy was 265 meters above the bottom. The data duration ranged from 10-14 months. The buoys were located near a major shipping lane, with an estimated 1.5 to 4.5 ships per day passing nearby. The data were sampled at 2500 Hz and have a bandwidth of 10-1000 Hz. Data are processed in eight 1/3-octave frequency bands, centered from 25 to 950 Hz, and monthly values of the following statistical quantities are computed from the resulting eight time series of noise spectral level: mean, median, standard deviation, skewness, kurtosis and coherence time.
520 $a Four hurricanes were recorded during the summer of 2004 and they have a major impact on all of the noise statistics. Noise levels at higher frequencies (400-950 Hz) peak during extremely windy months (summer hurricanes and winter storms). Standard deviation is least in the region 100-200 Hz but increases at higher frequencies, especially during periods of high wind variability (summer hurricanes). Skewness is positive from 25-400 Hz and negative from 630-950 Hz. Skewness and kurtosis are greatest near 100 Hz. Coherence time is low in shipping bands and high in weather bands, and it peaks during hurricanes.
520 $a The noise coherence is also analyzed. The 14-month time series in each 1/3-octave band is highly correlated with other 1/3-octave band time series ranging from 2 octaves below to 2 octaves above the band's center frequency. Spatial coherence between hydrophones is also analyzed for hydrophone separations of 2.29, 2.56 and 4.84 km over a 10-month period. The noise field is highly coherent out to the maximum distance studied, 4.84 km.
520 $a Additionally, fluctuations of each time series are analyzed to determine time scales of greatest variability. The 14-month data show clearly that variability occurs primarily over three time scales: 7-22 hours (shipping-related), 56-282 hours (2-12 days, weather-related) and over an 8-12 month period.
520 $a Keywords. Ambient noise, autocorrelation, acoustics, coherence, correlation, fluctuations, Fourier transform, Gulf of Mexico, hurricanes, kurtosis, long-term, omni-directional, percentiles, power spectral density, probability density functions, shipping noise, skewness, spectrogram, standard deviation, statistics, underwater, variability, variance, wave height, weather noise, wind speed.
590 $a School code: 0108.
650 4 $a Engineering, Marine and Ocean. $3 1019064
650 4 $a Physics, Acoustics. $3 1019086
690 $a 0547
690 $a 0986
710 2 $a University of New Orleans. $3 1019084
773 0 $t Dissertation Abstracts International $g 68-12B.
790 $a 0108
791 $a Ph.D.
792 $a 2007
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3292304