Abstract
This paper presents the results of a theoretical analysis of bathymetric effects on the Matched-Field-Processing (MFP) signal-gain-degradation (SGD). The bathymetry along the source track is characterized by small scale roughness, several small seamounts and one seamount that protrudes several hundred meters above the other seamounts. The analysis was obtained using a parabolic equation model to describe the “observed” acoustic field, the measured bathymetry along the source track, bottom characteristics representative of the region, and an experimentally obtained range dependent sound speed field for the water. The SGD results are computed over the full source track at low frequency. The simulations suggest that the SGD is primarily due to the interaction of energy with the nearby seamount. This degradation appears as isolated peaks at convergence zone separations measured relative to the nearby seamount.
This is a preview of subscription content, log in via an institution to check access.
Access this chapter
Tax calculation will be finalised at checkout
Purchases are for personal use only
Preview
Unable to display preview. Download preview PDF.
References
Collins, M.D. (1988) Fepe User’s Guide, NORDA Technical Note 365.
Collins, M. (1989) “Applications and time-domain solution of higher-order parabolic equations in underwater acoustics”, J. Acoust. Soc. Am. 86, 1097–1102
Porter, M. B. (1992) The KRAKEN Normal Mode Program, Saclant Undersea Research Centre.
Cornuelle, B.D., Worcester, P.F., Hildebrand, J.A., Hodgkiss, W.S., Duda, T.F., Howe, B.M., Mercer, J.A. and Spindel, R.C., “Vertical slice ocean tomography at 1000-km Range in the North- Pacific Ocean”, to be submitted.
Private communication with Peter Lonsdale.
Diachok, O., Wales, S., Dicus, R., Feirtag, F., Shirley, D. and Siegel, J. (1991) “Compressional and Shear Wave Velocities in the Upper Crust”, in Shear Waves in Marine Sediments, edited by J. M. Hovem et al., Kluwer Academic Publishers, 387–394.
Diachok, O., “New measurements of sound velocities in the upper crust: implications for crustal evolution,” to be submitted.
A. Tolstoy, O. Diachok and L.N. Frazer, “Acoustic tomography via matched field processing,” J. Acoust. Soc. Am. 89, 1119–1127 (1991).
Author information
Authors and Affiliations
Editor information
Editors and Affiliations
Rights and permissions
Copyright information
© 1995 Springer Science+Business Media Dordrecht
About this chapter
Cite this chapter
Smith, J.F., Diachok, O., Heitmeyer, R., Livingston, E. (1995). Stochastic Bathymetric Effects on Matched Field Processing. In: Diachok, O., Caiti, A., Gerstoft, P., Schmidt, H. (eds) Full Field Inversion Methods in Ocean and Seismo-Acoustics. Modern Approaches in Geophysics, vol 12. Springer, Dordrecht. https://doi.org/10.1007/978-94-015-8476-0_44
Download citation
DOI: https://doi.org/10.1007/978-94-015-8476-0_44
Publisher Name: Springer, Dordrecht
Print ISBN: 978-90-481-4545-4
Online ISBN: 978-94-015-8476-0
eBook Packages: Springer Book Archive