水面上に拡がった油膜の風によるDrift

概要

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Wind tunnel experiments were performed to investigate the drift of oil slicks on a water surface induced by wind. The moving rates of leading edge were measured for kerosene and n-heptane slick transported by wind of velocities of 0.3 2.18 m·s-1. When the oil slick spread on a water surface is blown by the wind, its leading edge proceeds due to the spread itself and the drift current induced by wind. The drift current was obtained by subtraction of the spreading rates from the experimental moving rates of leading edge. The drift current data for two kinds of oils agree with those for the oil-free water surface. The ratio of the drift current of slicks to the wind velocity approaches asymtotically the constant value 0.033 as the Reynolds number based on water depth, drift current and kinematic viscosity of water increases. Based on the experimental results, an estimation is developed as to how far an actual spill extends when the wind blows on the sea. The estimated values are compared with the field data obtained during actual accidents. The large difference between the field data and calculation based on the spreading on a calm water surface can be well explained by drift due to the wind.
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