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Irregular, unidirectional surface water waves incident on model ice in an icetank are used as a physical model of ocean surface wave interactions with seaice. Results are given for an experiment consisting of three tests, startingwith a continuous ice cover and in which the incident wave steepness increasesbetween tests. The incident waves range from causing no breakup of the icecover to breakup of the full length of ice cover. Temporal evolution of the iceedge, breaking front and mean floe sizes are reported. Floe size distributionsin the different tests are analysed. The evolution of the wave spectrum withdistance into the ice-covered water is analysed in terms of changes of energycontent, mean wave period and spectral bandwidth relative to their incidentcounterparts, and pronounced differences are found between the tests. Further,an empirical attenuation coefficient is derived from the measurements and shownto have a power-law dependence on frequency comparable to that found in fieldmeasurements. Links between wave properties and ice breakup are discussed.

Interactions between irregular wave fields and sea ice: A physical model for wave attenuation and ice breakup in an ice tank