Investigation of evaluation method for ship navigation in brash ice channels

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This study develops the method of estimating quantitatively a shape ratio and void fraction of the brash ice channel in a model experiment, evaluates their effects on channel resistance, and proposes the evaluation protocol of a channel resistance. As a result, the measurement methods of the void fraction and the sharing strength of a brash ice channel in model experiment were proposed, and the validity was discussed. In addition, the importance of the flow field for the numerical analysis is shown to obtain appropriate behavior of ice pieces. Numerical-analysis estimates the resistance appropriately when the channel is constructed with spherical ice pieces, while it overestimates the resistance when the channel contains cubic pieces. Because numerical-analysis results are well in agreement with experimental results when ship velocities are low, it is useful in respect of practical use. However, if a ship velocity is large, a channel resistance is overestimated.