Portable automatic field samplers have been found to overestimate concentrations of suspended sediment larger
than 88 micrometers (coarse silts and sands) when sampling using existing methods. Samplers configured with
intake manifolds were also found to substantially oversample coarse silts and sands.
This research improves the performance of automatic water samplers for sampling coarse silts and sands. A
sampling intake was developed that extracts samples from multiple locations in the cross-section. The new
sampling intake increases the range of sediment size where sampling accuracy is within +/- 10% to sand particles
less than an equivalent diameter of 250 micrometers. The sampling intake also performs with a predicted bias at
larger sediment sizes. The new intake thus demonstrates improved sampling accuracy and precision.
Minnesota Department of Transportation
Research Services Section
Gulliver, John S.; DeGroot, Greg.
Improved Automatic Sampling for Suspended Solids.
St. Anthony Falls Laboratory.
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