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Several phenomena are known to attenuate waves in the marginal ice zone, suchas wave scattering due to ice floes, viscous dissipation inside the ice andenergy dissipation caused by ice floe interactions. Our aim of this study is toinvestigate colliding ice floes and to quantify the Turbulent Kinetic Energy(TKE) dissipation in the surrounding water through direct observations. Thefield work was carried out in Van Mijen Fjord on Svalbard, where an artificial3x4 m^2 ice floe was sawed out in the 1 m thick ice. Wave motion was simulatedby pulling the ice floe back and forth in an oscillatory manner with twoelectrical winches in a 4x6 m^2 pool. Ice floe motion was measured with a rangemeter, and the water turbulence was measured with acoustic velocimeters. TKEfrequency spectra were found to contain an inertial subrange where energy wascascading at a rate proportional to f^(-5/3). From the spectra estimated atseveral vertical positions, the TKE dissipation rate was found to decreaseexponentially with depth. The total TKE dissipation rate was estimated byassuming that turbulence was induced over an area spanning over the ice floewidth and the pool length. The preliminary energy budget suggests thatapproximately 60% of the input power from the winches was dissipated inturbulence, which experimentally confirms that energy dissipation by inducedturbulent water motion is an important mechanism for colliding ice floe fields.

An investigation into the turbulence induced by moving ice floes