This paper presents a method for using surface loss as a function of angle in a parabolicequation (PE) model. In this method, the complex pressure field in a layer near the surface is transformed to vertical wavenumber space where a loss function is applied. The field is then transformed back to depth space and merged with the field outside the layer in preparation for the next range step in the PE model. Test cases show the method to be computationally efficient as well as accurate.
This article describes a method for efficient parabolic-equation modeling in the kilohertz frequency range. Computer use may be reduced to less than 1% of that expected with current standard methods by using a reduced calculation frequency but compressional-wave attenuation and boundary losses appropriate to the prediction frequency. Restrictions are discussed. Modeled and measured transmission loss are compared.
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