Shallow-water sound transmission measurements on the New Jersey continental shelf

Carey, William M.; Doutt, James A.; Evans, Richard B.; Dillman, Lynne M.

doi:10.1109/48.468241

Cited by 23 publications

(5 citation statements)

References 35 publications

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“…The source depths were 36 m in 1988 and 30 m in 1993, and the vertical receiver arrays were located in the bottom two thirds of the water column (with data used from 42.5, 57.5, and 73 m in 1988, and from 43.1, 52.6, and 69.7 m in 1993). A detailed description of the experiments is contained in Carey et al 2 In the first extensive analysis of these experiments by Evans and Carey, 3 parameters that characterize the nonlinear dependence of attenuation are referenced to the value at a frequency of 50 Hz, with a power-law exponent increase to a frequency of 1 kHz. In contrast, we use an estimate of the attenuation at 1 kHz based on the work of Hamilton 4 and determine the power-law decrease to lower frequencies.…”

Section: Introductionmentioning

confidence: 99%

Statistical analysis of sound transmission results obtained on the New Jersey continental shelf

Dediu

Siegmann

Carey

2007

The Journal of the Acoustical Society of America

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Experiments have been conducted near the site of AMCOR Borehole 6010 on the New Jersey Shelf to evaluate propagation predictability in sandy shallow-water environments. The influence of a nonlinear frequency dependence of the sediment volume attenuation in the uppermost sediment layer at this location is examined. Previously it was determined that a frequency power-law exponent of 1.5 was required for the best modeling of experimental results over the band 50-1000 Hz. The approach here references the attenuation to an accepted value at 1 kHz and makes extensive comparisons between measurements and calculations, to determine a power-law exponent of 1.85± 0.15.

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Section: Introductionmentioning

confidence: 99%

Statistical analysis of sound transmission results obtained on the New Jersey continental shelf

Dediu

Siegmann

Carey

2007

The Journal of the Acoustical Society of America

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“…This shows that sound waves are reflected from each other by the water column based on the grazing angle using the same principle as discussed previously. The wave then experiences transmission loss, the main cause of transmission loss in shallow waters is attenuation which is influenced by frequency and propagation loss which is influenced by distance because absorption and scattering are influenced by the type of sediment in the waters (Carey, 2003).…”

Section: Frequency 1000 Hzmentioning

confidence: 99%

Underwater Acoustic Propagation using Monterey-Miami Parabolic Equation in Shallow Water Kayeli Bay Buru Distric

Lalita,

Manik,

Brojonegoro

2024

JAGI

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Indonesia's geographical position is an advantage compared to other countries, both in terms of geoeconomics, geopolitics and geostrategy. For this reason, it is necessary to develop and use acoustic methods to describe underwater features, carry out underwater communications or to measure oceanographic variables at sea. This research was intended to provide an analytical and visual graphical description with the aim that it can be used for various purposes both in the research, military and other marine fields, as well as to analyze the influence of sediment and different frequencies on acoustic propagation patterns in shallow waters of Kayeli Bay. This research was conducted using CTD data from Kayeli Bay, which is a body of water in Buru Regency, Maluku Province and is located between 3° 15' 55'' – 3° 22' 50" S and 127° 01'35" – 127° 01' 35 "E, using the Monterey-Miami parabolic equation method using 4 types of sediment and 3 different frequencies as model input. From the results of this research it can be concluded that the propagation of sound waves in shallow seas is greatly influenced by the type of sediment and frequenty used. Changes in acoustic impedance at the bottom of the water and within the water column can significantly influence the behavior of acoustic waves in shallow water environments, and accurate acoustic impedance data are critical for effective ray tracing modelling.

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“…Descriptions of the ocean bottom in the Hudson Canyon area are available from other experiments that have been performed in the area. 16 A borehole known as AMCOR 6010 was drilled in 1976, 12 and seismic surveying was performed in the area. 17,18 Geoacoustic profile values for the first 50 m of the ocean bottom from Ref.…”

Section: B the Ocean Environmentmentioning

confidence: 99%

Extraction of acoustic normal mode depth functions using vertical line array data

Neilsen

Westwood

2002

The Journal of the Acoustical Society of America

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A method for extracting the normal modes of acoustic propagation in the shallow ocean from sound recorded on a vertical line array (VLA) of hydrophones as a source travels nearby is presented. The mode extraction is accomplished by performing a singular value decomposition (SVD) of individual frequency components of the signal's temporally averaged, spatial cross-spectral density matrix. The SVD produces a matrix containing a mutually orthogonal set of basis functions, which are proportional to the depth-dependent normal modes, and a diagonal matrix containing the singular values, which are proportional to the modal source excitations and mode eigenvalues. The conditions under which the method is expected to work are found to be (1) sufficient depth sampling of the propagating modes by the VLA receivers; (2) sufficient source-VLA range sampling, and (3) sufficient range interval traversed by the source. The mode extraction method is applied to data from the Area Characterization Test II, conducted in September 1993 in the Hudson Canyon Area off the New Jersey coast. Modes are successfully extracted from cw tones recorded while (1) the source traveled along a range-independent track with constant bathymetry and (2) the source traveled up-slope with gradual changes in bathymetry. In addition, modes are successfully extracted at multiple frequencies from ambient noise.

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Shallow-water sound transmission measurements on the New Jersey continental shelf

Cited by 23 publications

References 35 publications

Statistical analysis of sound transmission results obtained on the New Jersey continental shelf

Statistical analysis of sound transmission results obtained on the New Jersey continental shelf

Underwater Acoustic Propagation using Monterey-Miami Parabolic Equation in Shallow Water Kayeli Bay Buru Distric

Extraction of acoustic normal mode depth functions using vertical line array data

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