AN EFFICIENT ENHANCEMENT OF FINITE-DIFFERENCE IMPLEMENTATIONS FOR SOLVING PARABOLIC EQUATIONS

The parabolic approximation method is widely recognised as useful for accurately analysing and preiction sound transmission intensity in diverse ocean environments. One reason for its attractiveness is that solutions are marched in range, thereby avoiding the large internal storage requirements when using the full wave equation. Present finite-difference implementations employ a range step size that is prescribed by either the user or the code and that remains fixed for the duration of the computation. An algorithm is presented in which the range step is adaptively selected by a procedure within a version of the implicit finite-difference (IFD) implementation of the parabolic approximation. An error indicator is computed at each range step and its value is compared to an error tolerance window that is readily specified by the user. Additional related modifications to the IFD implementations are discussed. Several examples are presented that illustrate the efficacy of the enhanced algorithm.

  • Supplemental Notes:
    • Acoustical. Soc. Am. J., 1 (1989), p.252 (Jul.) [9 pp., 18 ref., 1 tab., 11 fig.]
  • Authors:
    • Robertson, J S
    • Arney, D C
  • Publication Date: 1989

Language

  • English

Subject/Index Terms

Filing Info

  • Accession Number: 00716210
  • Record Type: Publication
  • Source Agency: British Maritime Technology
  • Files: TRIS
  • Created Date: Feb 28 1996 12:00AM