PE APPROXIMATIONS FOR SCATTERING FROM A ROUGH SURFACE

PDF

Authors
  1. Thomson, D.J.
Corporate Authors
Defence Research Establishment Pacific, Victoria BC (CAN)
Abstract
Two methods are presented for incorporating the effects of rough boundaries into propagation models based on the parabolic equation (PE) approximation. In particular, the acoustic scattering by a deterministically-rough, pressure-release surface is considered. In the first method, the vertical extent of the computational cell adjacent to the rough boundary is allowed to vary with range. This non-standard grid approach can readily be incorporated into existing finite-difference PE codes. In the second method, a low-impedance air-layer backing is appended to the rough surface and the original rough-surface scattering problem is replaced by one involving scattering from an internal, water/air interface. In this case, both finite-difference and split-step marching algorithms can be accommodated. Numerical results for the forward-scattered component of the field are provided for two benchmark problems.
Keywords
ROUGH BOUNDARIES;PRESSURE RELEASE SURFACE;AIR LAYER BACKING;WATER AIR INTERFACE;SPLIT STEP;MARCHING ALGORITHMS
Report Number
DREP-TM-95-21 —
Date of publication
01 Mar 1995
Number of Pages
24
DSTKIM No
95-03452
CANDIS No
151186
Format(s):
Document Image stored on Optical Disk;Hardcopy

Permanent link

Document 1 of 1

Date modified: