Repeatability and Oblique Flow Response Characteristics of Current Meters

by Janice M. Fulford, U.S. Geological Survey, Stennis Space Center, United States,
Kirk G. Thibodeaux, U.S. Geological Survey, Stennis Space Center, United States,
William R. Kaehrle, U.S. Geological Survey, Stennis Space Center, United States,



Document Type: Proceeding Paper

Part of: Hydraulic Engineering

Abstract: Laboratory investigation into the precision and accuracy of various mechanical-current meters are presented. Horizontal-axis and vertical-axis meters that are used for the measurement of point velocities in streams and rivers were tested. Meters were tested for repeatability and response to oblique flows. Both horizontal- and vertical-axis meters were found to under- and over-register oblique flows with errors generally increasing as the velocity and angle of flow increased. For the oblique flow tests, magnitude of errors were smallest for horizontal-axis meters. Repeatability of all meters tested was good, with the horizontal- and vertical-axis meters performing similarly.

Subject Headings: Flow measurement | Fluid flow | Water flow | Rivers and streams | Streamflow | Errors (statistics) | Wave velocity

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