TURBULENCE MEASUREMENTS IN A TIDAL CURRENT.
NAVAL UNDERWATER WEAPONS RESEARCH AND ENGINEERING STATION NEWPORT R I
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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 0cm to 0.157cm. The composite energy spectrum obtained from the individual spectra was of the -53 power law form predicted by the Kolmogoroff hypothesis for wave numbers from 0.01cm to 0.026cm. 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
- Physical and Dynamic Oceanography