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SOURCES OF ERRORS IN THE DIFFERENTIAL PRESSURE MEASUREMENT WHEN MEASURING SEDIMENT CONCENTRATION IN FLOWING STREAMS

Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan www.asabe.org

Citation:  Paper number  032286,  2003 ASAE Annual Meeting . (doi: 10.13031/2013.13829) @2003
Authors:   E. W. Tollner and Bruce Upchurch, Todd Rasmussen
Keywords:   sediment, turbulence, turbidity, hot film anemometer, pressure transducer

The source of fluctuations in the output signal of a densimeter, and in situ suspended-sediment measurement device, were studied from a fluid turbulence view. Although the densimeter produced accurate results in the laboratory for concentrations of 10 mg/L to 1000 mg/L, there was a 30 mV (0.061 mm H2O, or equivalently, 500 mg/l sediment) fluctuation in the field test results, corresponding to an 8.8% error (full scale). A case is made for future studies that attempt to relate pressure standard deviation to sediment concentration. A case is also made for developing an automated sampling system that removed aliquots from the stream and allowed settling to occur in a quiescent condition.

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