Abstract
Data obtained by Medwin and D'Spain [J. Acoust. Soc. Am. 79, 657 (1986)] for low-frequency, near-grazing propagation over gravel-covered rigid planes are inverted by applying the procedure developed earlier [Lucas and Twersky, J. Acoust. Soc. Am. Suppl. 1 79, S68 (1986)] for regularly shaped protuberances. The development is based on analytical results for a point source irradiating an embossed plane, and on the uniform asymptotic representation of the coherent field as a Sommerfeld type wave system in terms of the complex error function complement Q [J. Acoust. Soc. Am. Suppl. 1 74, S122 (1983); 76, 1847 (1984)]. Initial estimates of unknown parameters are obtained by working with elementary approximations of the Q integral, and then using the complete integral for refinements and final computations. The corresponding graphical results display the primary data trends for the magnitudes of the normalized fields and for the incremental dispersion (phase velocity) versus frequency at different ranges. The procedure delineates the roles of interference and damping on the elementary wave components of the Sommerfeld type system.
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