Accession Number : ADA187561

Title :   A Comparison of Diode-Laser-Doppler Velocimeter and Medium Resolution Turbulence Cluster Measurements in MIZEX 84.

Descriptive Note : Technical rept.,

Corporate Author : MCPHEE RESEARCH CO YAKIMA WA

Personal Author(s) : McPhee, Miles G

PDF Url : ADA187561

Report Date : Dec 1985

Pagination or Media Count : 24

Abstract : During the MIZEX 84 Experiment two prototype Diode-Laser-Doppler Velocimeters were tested in the oceanic boundary layer under a drifting ice floe. Part of the testing included a comparison of turbulent flow measured with the DLDV instruments and with a so-called Medium Resolution Cluster of small partially ducted rotors mounted along orthogonal axes, used in a separate boundary-layer experiment. This report presents data from 15 runs in which the two systems, suspended on the same inverted mast but separated vertically by about half a meter, measured the flow simultaneously. One-second averages of the DLDV and MRC output are presented, along with statistics of flow measured by each system, direct comparison of the horizontal and 45-degree components, and autospectra and squared coherency calculated from each of 12 fourteen-minute runs. Overall, flow measurements made with the DLDV instruments compare favorably with those of the MRC.

Descriptors :   *BOUNDARY LAYER, *SEA ICE, *TURBULENT FLOW, AXES, CLUSTERING, COMPARISON, DRIFT, DUCTS, FLOW, INVERSION, MASTS, MEASUREMENT, OCEANS, ORTHOGONALITY, RESOLUTION, ROTORS, STATISTICS

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

Distribution Statement : APPROVED FOR PUBLIC RELEASE