Acoustic remote sensing of shallow ocean sediment characteristics

Chouhan, H. M. ; Anand, G. V. (1991) Acoustic remote sensing of shallow ocean sediment characteristics Journal of the Acoustical Society of America, 89 (4B). p. 1883. ISSN 0001-4966

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In this paper, a procedure is presented for estimating the acoustic parameters of shallow ocean sediments from the sound field measurements using a horizontal array. The sediment is modeled as a fluid with sound speed c at the water-sediment interface, a constant sound-speed gradient g, and a constant density ρ . Initially, the modal wave numbers km (m = 1,2,...,M) are estimated using the generalized pencil-of-functions method. Next, an iterative procedure is used for estimating (c,g,ρ ). This procedure is based on the fact that the phase change Φ m of the modal waves at the water-sediment interface can be determined from the dispersion relation using the estimated values of km. The phase change Φ ^m of the modal waves can also be computed for any assumed values of (c,g,ρ ). Estimates of (c,g,ρ ) are obtained by adjusting their values so as to minimize the error Σm = ∑ mmm)2. Simulation results are presented to illustrate the method.

Item Type:Article
Source:Copyright of this article belongs to Acoustical Society of America.
ID Code:71982
Deposited On:28 Nov 2011 05:00
Last Modified:28 Nov 2011 05:00

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