00000nam 2200000zi 4500 9.953869 CaOODSP 20250916152229 m o d f cr |n||||||||| 250807e199412 bccad obt f000 0 eng d CaOODSP eng rda CaOODSP n-cn--- DR52-11/21-1994E-PDF Brooke, Gary H.,‏ 1950-‏ author. Internal interface conditions for the finite-difference PE applications to layered acoustic media / by Gary H. Brooke and Philip M. Wort. Victoria, B.C. : Defence Research Establishment Pacific = Centre de recherches pour la défense pacifique : Research and Development Branch, Department of National Defence, December 1994. 1 online resource (i, 31 pages, 3 unnumbered pages) : illustrations, charts. text txt rdacontent computer c rdamedia online resource cr rdacarrier Technical memorandum ; 94-145 Digitized edition from print [produced by Defence Research and Development Canada]. Includes bibliographical references (pages 30-31). "The traditional one-way parabolic equation (PE) formulation for range-dependent layered acoustic media is modified to include effects associated with interfaces internal to the computational grid. Both first- and second-order approximations are derived which effectively translate the effects of internal boundary conditions onto nearby grid points. [...]. Consideration of second-order conditions also allows sloping internal interfaces to be accommodated. Numerical results obtained for standard test cases are used to demonstrate the application of the analysis. In shallow water, particularly at ranges greater than 20 km, there is an indication that precise definition of the interface depth is required in order to minimize errors that could negatively affect matched field processing applications. Alternatively, imprecision in interface location to within one computational grid width does not significantly affect the field prediction in oceans with water depths greater than 500 m or so"--Abstract (page i). Underwater acoustics Canada. Acoustique sous-marine Canada. Defence Research Establishment Pacific, issuing body. Canada. Department of National Defence. Research and Development Branch, issuing body. Technical memorandum (Defence Research Establishment Pacific) 94-145. (CaOODSP)9.936067 PDF 306 KB https://publications.gc.ca/collections/collection_2025/rddc-drdc/DR52-11-21-1994-eng.pdf