Continuous Gradient Ray Tracing System (CONGRATE) Bottom Loss Models.
NAVY UNDERWATER SOUND LAB NEW LONDON CONN
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The fundamental CONGRATS programs, S0990 and S0991, have been revised to calculate bottom loss as a function of grazing angle. The bottom loss curves have been computed with frequency, MGS Acoustic Province, and both frequency and porosity as basic parameters. The bottom loss models have been described in detail, examples and comparisons have been provided, and the new input options have been explained. subroutines INPUT and BLOSS have been revised in order to accommodate the new bottom loss models, and a new subroutine, Subroutine BTMLOS, has been written to compute the bottom loss curves. These three routines are listed in the appendix. The ray plotting, eigenray generation, and eigenray processing functions of the CONGRATS series have not been altered in any way other than as described in this memorandum. It is hoped that the additional bottom loss options will be a convenience for users of the CONGRATS series.