Spectral Bars - Fortran code for the nonlinear evolution of migrating free bars with spectral methods

Fortran code for the nonlinear evolution of migrating free bars in a straight channel, solving the coupled Shallow Water and Exner equations using a Fourier spectral method. The repository also includes MATLAB scripts for linear stability analysis and post‑processing of the simulation outputs. Originally developed by M. Colombini and M. Tubino (Colombini & Tubino (1991), “Finite amplitude free bars: a fully nonlinear spectral solution,” Euromech 262). Revised and expanded by F. Weber, M. Toffolon, and A. Siviglia.