Current meters for measurement of low-speed velocities in ice-covered lakes
Limnol. Oceanogr., 43(7), 1998, 1661-1668 | DOI: 10.4319/lo.1922.214.171.1241
ABSTRACT: Two current meters for measurement of low-speed currents in ice-covered lakes, a drag-wire current meter (DWCM) and an acoustic current meter (ACM), are presented. The recording range is 0.1-20 mm s-l for the DWCM and 0.2-70 mm s-l for the ACM. The accuracy, obtained from laboratory calibration, is ±30% of the velocity reading and ± 10° for direction for the DWCM and ±40% of the velocity reading and ± 10° for direction for the ACM. Comparison of the two devices in the field and between simultaneous DWCM recordings and drogue observations, performed in a wind-protected hole in the ice, showed reasonable agreement.