Accession Number : AD0676308

Title :   TURBULENCE MEASUREMENTS IN A TIDAL CURRENT.

Descriptive Note : Technical rept.,

Corporate Author : NAVAL UNDERWATER WEAPONS RESEARCH AND ENGINEERING STATION NEWPORT R I

Personal Author(s) : Massey,Alan T.

Report Date : AUG 1968

Pagination or Media Count : 126

Abstract : Measurements were made of the component of turbulent velocity along the axis of a 3-knot tidal current 1.5 meters below the water surface using a ducted impeller current meter. Values of the one-dimensional energy spectra were computed on a digital computer at wave numbers from 0/cm to 0.157/cm. The composite energy spectrum obtained from the individual spectra was of the -5/3 power law form predicted by the Kolmogoroff hypothesis for wave numbers from 0.01/cm to 0.026/cm. At higher wave numbers the energy spectrum decreased more rapidly than predicted because of attenuation of the turbulent velocity variations caused by the relatively large size of the current meter. The average variance for the field of turbulence was 55.6 sq cm - sq sec plus or minus 25.0 (standard error), and the average rate of energy dissipation by viscosity was estimated using the Kolmogoroff hypothesis as 0.84 sq cm - cu sec. (Author)

Descriptors :   (*OCEAN CURRENTS, TURBULENCE), TIDES, MEASURING INSTRUMENTS, VELOCITY, DIGITAL COMPUTERS, VISCOSITY, ATTENUATION, INTERACTIONS, ENERGY, ANALYSIS OF VARIANCE, SENSITIVITY, MATHEMATICAL ANALYSIS, DATA PROCESSING, INSTRUMENTATION, RESPONSE, OCEAN WAVES, STATISTICAL DATA

Subject Categories : Physical and Dynamic Oceanography

Distribution Statement : APPROVED FOR PUBLIC RELEASE