00000000nam 2200000zi 4500
0019.953879
003CaOODSP
00520250917094247
006m     o  d f      
007cr |n|||||||||
008250807e199503  bccad   obt  f000 0 eng d
040 |aCaOODSP|beng|erda|cCaOODSP
043 |an-cn---
0861 |aDR52-11/27-1995E-PDF
1001 |aThomson, D. J.|q(Douglas John)|eauthor.
24510|aPE approximations for scattering from a rough surface / |cD.J. Thomson, G.H. Brooke & E.S. Holmes.
264 1|aVictoria, B.C. : |bDefence Research Establishment Pacific = Centre de recherches pour la défense pacifique : |bResearch and Development Branch, Department of National Defence, |cMarch 1995.
300 |a1 online resource (19 pages, 3 unnumbered pages) : |billustrations, charts.
336 |atext|btxt|2rdacontent
337 |acomputer|bc|2rdamedia
338 |aonline resource|bcr|2rdacarrier
4901 |aTechnical memorandum ; |v95-21
500 |aDigitized edition from print [produced by Defence Research and Development Canada].
504 |aIncludes bibliographical references (pages 18-19).
5203 |a"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"--Abstract (page 1).
650 0|aUnderwater acoustics|zCanada.
650 0|aSound|xTransmission.
650 6|aAcoustique sous-marine|zCanada.
650 6|aSon|xPropagation.
7102 |aDefence Research Establishment Pacific, |eissuing body.
7101 |aCanada. |bDepartment of National Defence. |bResearch and Development Branch, |eissuing body.
830#0|aTechnical memorandum (Defence Research Establishment Pacific)|v95-21.|w(CaOODSP)9.936067
85640|qPDF|s968 KB|uhttps://publications.gc.ca/collections/collection_2025/rddc-drdc/DR52-11-27-1995-eng.pdf