A HYBRID SPLIT-STEP/FINITE-DIFFERENCE PE ALGORITHM FOR VARIABLE-DENSITY MEDIA

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Authors
  1. Yevick, D.
  2. Thomson, D.J.
Corporate Authors
Defence Research Establishment Atlantic, Dartmouth NS (CAN);Queen's Univ, Kingston ONT (CAN) Dept of Electrical Engineering
Abstract
Although variations in the density, p, are naturally incorporated into finite-difference parabolic equation (PE) solvers, split-step PE algorithms traditionally account for density changes by adding to the refractive index terms containing derivatives of p. As a consequence, geoacoustic before profiles that contain step discontinuities at layer interfaces must be smoothed appropriately before these extra terms can be evaluated. In this paper, a new hybrid method is proposed for treating density inhomogeneities in the split-step PE. This approach involves splitting the differential operator into density-independent and density-dependent components. While the former terms any be evaluated with the split-step Fourier technique, the influence of density changes is handled through a finite-difference procedure. Such an algorithm can be easily implemented in recently proposed hybrid split-step/finite-difference and split-step/Lanczos PE solvers.
Keywords
Geoacoustic data;Split -Step Fourier;Density variations
Date of publication
02 Oct 1996
Number of Pages
8
Reprinted from
J Acoust Soc Am, vol 101, no 3, 1997, p 1328-1335
DSTKIM No
97-02665
CANDIS No
502901
Format(s):
Hardcopy;Document Image stored on Optical Disk

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