ON A DYE DIFFUSION EXPERIMENT OFF LONG ISLAND.
LAMONT GEOLOGICAL OBSERVATORY PALISADES N Y
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Dye diffusion experiments were made on September 11 and 12 1963 thirty miles south off Long Island. Ten gallons of Rhodamine B dye were pumped at three depths 0, 3m and 7m in the water each day. On the first day, the dye patch showed a curved pattern and dye was diffused only above 10 meters, perhaps due to rather calm weather conditions. On the second day, the dye patch was elongated but did not show a remarkable curvature also, dye penetrated into deeper than 70 meters, owing to strong mixing caused by winds of 15 to 20 knots. In Appendix I, a mathematical model of wind-driven currents in the ocean with a finite depth for eddy viscosity decreasing exponentially with depth was treated. It is shown that the hodograph of the currents has a stronger curvature near the surface for eddy viscosity decreasing downwards than the ordinary Ekman spiral for a constant eddy viscosity. In Appendix II, the study of three-dimensional structure of wind waves was reviewed. A hydrodynamic model of a stationary cellular convection superposed on a horizontal current was discussed. Author