Frequency dependence of sediment attenuation in two low-frequency shallow-water acoustic experimental data sets

Author

Evans, Richard B. ; Carey, William M.

Author_Institution

SAIC, New London, CT, USA

Volume

23

Issue

4

fYear

1998

fDate

10/1/1998 12:00:00 AM

Firstpage

439

Lastpage

447

Abstract

Shallow-water transmission loss measurements taken in 1988 and 1993 along the same cross slope track on the New Jersey shelf are examined for the frequency interval 50-1000 Hz. Computed results, using a geoacoustic model based on a linear frequency dependence of the sediment volume attenuation, showed less loss than the measured data at the higher frequencies. A two stage, least squares procedure, is developed as a means of quantitatively examining the differences between the measured and computed results. The procedure focuses on the frequency dependence of the sediment volume attenuation and allows the comparison between measurements and computations to be formulated as a statistical test of hypothesis. A geoacoustic model, using a nonlinear frequency dependency and reasonable uncertainty for the sediment volume attenuation, provides a good fit to the data

Keywords

acoustic wave absorption; hydrophones; inverse problems; least squares approximations; sediments; underwater sound; 50 to 1000 Hz; New Jersey shelf; cross slope track; geoacoustic model; least squares procedure; linear frequency dependence; low-frequency shallow-water acoustics; sediment attenuation; statistical test of hypothesis; transmission loss measurements; Acoustic measurements; Attenuation measurement; Frequency dependence; Frequency measurement; Geophysical measurements; Loss measurement; Propagation losses; Sea measurements; Sediments; Volume measurement;

fLanguage

English

Journal_Title

Oceanic Engineering, IEEE Journal of

Publisher

ieee

ISSN

0364-9059

Type

jour

DOI

10.1109/48.725237

Filename

725237