Method: Hybrid mode-flux theory (an asymptotic approximation of Soprano model)
Model output: propagation loss (incoherent) in the water layer
Description: Analytical equations of SOPRANO can be simplified for the mode-stripping region for the cases many modes propagate (such as higher frequencies than the cut-off frequency). Based on the asymptotic approximations for the mode-stripping region, a simple and fast formula can be obtained. This mode-stripping region formulation can be used for real-time applications such as ship sound mapping at high frequencies, where other models are computationally expensive.
Examples: A comparison between Soprano and M-Soprano is shown below for the range dependent Weston Memorial Workshop test cases. In these figures, the relative propagation loss is plotted to see the differences in detail.
Picture
Comparison of between SOPRANO(left) and MEZZO-SOPRANO (right). Relative Propagation Loss is shown to see the differences in detail [2].
Software request form: This software is not available as an open-source yet. It will be announced on the main page when it becomes available.
Feedback/suggestions: If you have any questions, feedback, or suggestion, please contact us with the feedback form  or e-mail.
H. Özkan Sertlek, e-mail: h.o.sertlek@tudelft.nl
References:
  1. H.Ö.Sertlek, M.A. Ainslie, A depth-dependent formula for shallow water propagation, J. Acoust. Soc. Am.,136(2),57-582,2014, [CrossRef].
  2. H.Ö.Sertlek, M.A. Ainslie, K. Heaney,  Analytical and Numerical Propagation Loss Predictions for Gradually Range-Dependent Isospeed Waveguides, IEEE Journal of  Ocean Engineering, Volume: 44, Issue: 4, Oct. 2019, [CrossRef].
  3. H.Ö. Sertlek, Aria of the Dutch North Sea, Ph.D. thesis, University of Leiden, 2016, [CrossRef]