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The possibility of hydrodynamic diffusion in a model of grease ice stirred bythe velocity field of a gravity wave is explored. It is argued that mechanicalinteractions among ice crystals can induce disturbances in the fluid velocity -in the form of interstitial flows - analogous to those leading to diffusion infixed beds. A two-fluid description of the system is introduced, in which theice matrix is treated as a deformable porous medium. Depending on the range ofparameters, the effective diffusivity of the medium can exceed the value whichwould be obtained by only keeping into account particle dislocation induced bycontact interactions.

Mechanical diffusion in grease ice stirred by gravity waves