Accession Number : AD0717638

Title :   An Investigation of Instrumentation and Techniques for Observing Turbulence in and Above the Oceanic Bottom Boundary Layer,

Corporate Author : NEW YORK UNIV BRONX GEOPHYSICAL SCIENCES LAB

Personal Author(s) : Frey,Henry R.

Report Date : DEC 1970

Pagination or Media Count : 104

Abstract : Calibrations of Flow Corporation conical hot platinum film probes indicate a downward shift in sensivity due to film deterioration, a sudden increase in cold increase preceding catastrophic failure, a one-third greater radial than axial sensitivity, ambiguities in the value of the exponent n in King's Law, and a maximum life of 20.5 hours. Field experience indicates poor reliability and an inordinate amount of necessary experimental precautions. A stereophotogrammetric current meter prototype is described. With modifications, the prototype holds promise for Lagrangian velocity field observations. Two Hydro-Products Model 465-A current direction sensors were examined for biases introduced by frictional coupling. Negative deviations were obtained for clockwise rotations of the vane relative to the housing, and positive deviations were obtained when the housing was rotated in the same relative sense. Bottom-mounted apparatus and a mooring station off Race Point, Cape Cod are described. Vertical current profiles displayed large variations in form. (Author)

Descriptors :   (*OCEANOGRAPHIC EQUIPMENT, DESIGN), (*OCEAN BOTTOM, *OCEAN CURRENTS), PROBES, CALIBRATION, THERMISTORS, STEREOPHOTOGRAPHY, PHOTOGRAMMETRY, TURBULENCE, MEASURING INSTRUMENTS, MOORING, BOUNDARY LAYER, WIND, RECORDING SYSTEMS, TEMPERATURE, PERFORMANCE(ENGINEERING)

Subject Categories : Physical and Dynamic Oceanography
      Test Facilities, Equipment and Methods

Distribution Statement : APPROVED FOR PUBLIC RELEASE