A theoretical investigation of the motion of bergy bits and growlers near a gravity based structure was conducted, taking into account the effect of the diffraction of waves by the structure. A nonlinear time-domain method based on the concept of modal potentials (equivalent motion concept) and a corresponding computational algorithm are presented. Large heave motions of a spherical ice mass are predicted in close vicinity of the structure. In addition to instances where collisions were predicted, the ice drifted around or maintained a stationary position in front of the structure.

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