AN IMPROVED KIRCHHOFF FORMULA FOR REFLECTION LOSS AT A ROUGH OCEAN SURFACE AT LOW GRAZING ANGLES

Authors
  1. Chapman, D.M.F.
Corporate Authors
Defence Research Establishment Atlantic, Dartmouth NS (CAN)
Abstract
The calculation of specular reflection loss at a rough ocean surface is a time-consuming procedure if the boundary perturbation or mode-coupling methods are used. The simple Kirchhoff formula is often used as an estimate of reflection loss, but this is shown to severely underestimate the loss at small grazing angles. A formula is derived using the large correlation length limit of the boundary perturbation calculation, and is shown to be a more accurate estimate of the reflection loss at small grazing angles than the Kirchhoff formula. The new formula is identical with the Kirchhoff formula at large grazing angles.
Report Number
DREA-82-1 —
Date of publication
01 Jan 1983
Number of Pages
8
Reprinted from
J Acoust Soc Am, vol 73, no 2, 1983, p 520-527
DSTKIM No
83-01283
CANDIS No
39218
Format(s):
Hardcopy;Originator's fiche received by DSIS

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