Calculation of wave propagation with elastic boundary conditions.

Abstract

Calculations of compressional and shear wave transmissions and reflections through sediment layers are utilized to derive a single bottom reflection coefficient by formulating an infinite sum of matrices and expressing the result as a convergent series. The expression of bottom loss as a single coefficient eliminates the need to search for sediment mode eigenvalues, resulting in an improvement in efficiency. When implemented in a normal mode propagation model, the bottom loss prediction is shown to successfully reproduce resonance effects due to shear wave conversion in various types of sediments. Comparisons of boundary calculations to other published results are presented and propagation predictions are compared to a number of measured data sets.