Impacts of Wind and Current on Geometrical Ship-Bridge Collision Frequency

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Abstract
Based on analyzing the variation of ship's track and width of the swept path of bridge area caused by wind and current quantitatively, the paper presents the modified geometrical ship-bridge collision frequency model considering the impacts of wind and current based on the classical model. The observation data and experimental data based on large-scale maneuvering simulator are used to modify the model too. The improved model introduces path deviation coefficient and path width correction coefficient and establishes a quantitative formula with the relation of geometrical ship-bridge collision frequency to the wind-induced drift, current-induced drift and the corresponding deflection. Quantitative analysis results show that this modification can reflect properly the influence of wind and current on the characteristic of ship-bridge collision frequency. The improved model decreases systemic error with the selection of correction parameter regarding to wind and current and has more practical applicability.

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