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- Publisher
- American Meteorological Society
- Copyright
- Copyright © 1997 American Meteorological Society
- ISSN
- 1520-0426
- DOI
- 10.1175/1520-0426(1999)016<1499:DMWAMI>2.0.CO;2
- Publisher site
- See Article on Publisher Site
Abstract
A moored and autonomous instrument that measures velocity and temperature fluctuations in the inertial subrange using shear probes and FP07 thermistors has been deployed in a swift O (1 m s −−1 ) tidal channel for eight days. The measured velocity signals are free from body vibrations for frequencies below 16 Hz in flows faster than 0.5 m s −−1 and below 8 Hz for slower flows. At lower frequencies, fluctuations of torque on the instrument, due mainly to fluctuations of the ambient current, produce large pitching and rolling motions (≈≈4°° peak) that can easily be reduced by minor mechanical changes. Vibrations at higher frequencies do not scale with flow speed and stem mainly from mechanical structures. The velocity spectrum is free from contamination by body motions between 0.2 and 20 cpm (the inertial subrange), and consistent estimates of the rate of dissipation of kinetic energy are obtained from the spectral levels of vertical and lateral velocity fluctuations within this range.
Journal
Journal of Atmospheric and Oceanic Technology – American Meteorological Society
Published: Jun 13, 1997