title: Development of a Finite-Difference Time Domain (FDTD) Model for Propagation of Transient Sounds in Very Shallow Water.
abstract: This finite-difference time domain (FDTD) model for sound propagation in very shallow water uses pressure and velocity grids with both 3-dimensional Cartesian and 2-dimensional cylindrical implementations. Parameters, including water and sediment properties, can vary in each dimension. Steady-state and transient signals from discrete and distributed sources, such as the surface of a vibrating pile, can be used. The cylindrical implementation uses less computation but requires axial symmetry. The Cartesian implementation allows asymmetry. FDTD calculations compare well with those of a split-step parabolic equation. Applications include modeling the propagation of individual fish sounds, fish aggregation sounds, and distributed sources.
authors.affiliation: Department of Physics, East Carolina University, Greenville, NC, 27858, USA. spraguem@ecu.edu.
authors.forename: Mark W
authors.initials: MW
authors.lastname: Sprague
authors.affiliation: Department of Biology, Institute for Coastal Science and Policy, East Carolina University, Greenville, NC, 27858, USA. luczkovichj@ecu.edu.
authors.forename: Joseph J
authors.initials: JJ
authors.lastname: Luczkovich
mesh_terms: D008962:Models, Theoretical; D013016:Sound; D013997:Time Factors; D014867:Water
chemical_list: D014867:Water
keywords: Propagation model; Time domain