ON A DYE DIFFUSION EXPERIMENT OFF LONG ISLAND.

Abstract

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)

Document Details

Document Type
Technical Report
Publication Date
May 01, 1964
Accession Number
AD0601480

Entities

People

  • Takashi Ichiye

Tags

DTIC Thesaurus Topics

  • Convection
  • Curvature
  • Diffusion
  • Dyes
  • Geometric Forms
  • Geometry
  • Hodographs
  • Laser Dyes
  • Lines (Geometry)
  • Mathematical Models
  • Models
  • Stationary
  • Three Dimensional
  • Viscosity

Readers

  • Fluid Dynamics.
  • Oceanography.
  • Optical Physics and Photonics.