title: A three-dimensional, longitudinally-invariant finite element model for acoustic propagation in shallow water waveguides.
abstract: A three-dimensional, longitudinally-invariant finite element (FE) model for shallow water acoustic propagation is constructed through a cosine transform of a series of two-dimensional FE models at different values of the out-of-plane wavenumber. An innovative wavenumber sampling method is developed that efficiently captures the essential components of the integral as the out-of-plane wave number approaches the water wavenumber. The method is validated by comparison with benchmark solutions of two shallow water waveguide environments: a flat range independent case and a benchmark wedge.
authors.affiliation: Applied Research Laboratories, The University of Texas at Austin, Austin, Texas 78713-8029 misakson@arlut.utexas.edu, goldsbe@arlut.utexas.edu, chotiros@arlut.utexas.edu.
authors.forename: Marcia J
authors.initials: MJ
authors.lastname: Isakson
authors.affiliation: Applied Research Laboratories, The University of Texas at Austin, Austin, Texas 78713-8029 misakson@arlut.utexas.edu, goldsbe@arlut.utexas.edu, chotiros@arlut.utexas.edu.
authors.forename: Benjamin
authors.initials: B
authors.lastname: Goldsberry
authors.affiliation: Applied Research Laboratories, The University of Texas at Austin, Austin, Texas 78713-8029 misakson@arlut.utexas.edu, goldsbe@arlut.utexas.edu, chotiros@arlut.utexas.edu.
authors.forename: Nicholas P
authors.initials: NP
authors.lastname: Chotiros