Ray Schaffranek (retired) Marvin A. Franklin (retired)
Four intensive data-collection trips into the Taylor Slough Basin were conducted during July, September, and November 1997 and July 1998. These trips coincided with precipitation events that produced sufficient water levels for airboat access and covered a wide range of water levels and flow conditions. The ADV meters provided the required levels of accuracy in flow-velocity measurements while enabling rapid collection of multiple time-series of flow data at remote sites. Concurrently, flow measurements were made along bordering road culverts and under L-31W and Taylor Slough bridges. At sites where the use of acoustic instruments was impractical, vertical-axis current meters were used to measure water velocity.
Water-quality meters (collected with all velocity profiles) collected data at middepth and measured the temperature, specific conductance, salinity, dissolved oxygen, and pH. Measured temperature and salinity values were use in computation of water velocity. All water-quality meters were calibrated at the beginning of each day.
After positioning the ADV for a velocity measurement with minimal disturbance to the surrounding vegetation and flow field, the hydrographer retreated from the probe and the presumed flow path. About 2 minutes was allowed for the sample area to return to equilibrium before starting a velocity measurement. Measurement bursts lasted 120 seconds, at a 10 hertz sampling rate, and produced time-series measurements of 1200 pints at the appropriate depths in the water column.
U.S. Department of the Interior, U.S. Geological Survey, Center for
Coastal Geology
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