This talk will cover three relevant aspects of marginal ice dynamics. First, I’ll report on recent field campaigns held in the Saguenay fjord and the St. Lawrence Estuary, Canada, to measure sea ice mechanical properties using non-destructive seismic wave analysis, and in one instance prior to the full characterization of a wave-induced fracture event generated by an icebreaker. I’ll then report on mostly qualitative observations of frazil ice behaviour in the presence of waves and discuss its representation in models. I’ll finally present the design of an empirical floe size-dependent rheology and preliminary results of sea ice thickening and deformation using an idealized CICE configuration.