At-Stream-Velocity Pumping Sediment Sampling System

by James P. Bennett, (A.M.ASCE), Res. Hydro.; U.S. Geological Survey, Fort Collins, CO,


Serial Information: Journal of the Hydraulics Division, 1973, Vol. 99, Issue 6, Pg. 873-887


Document Type: Journal Paper

Discussion: Chao Junnling L. (See full record)

Abstract: The sampling system collects water-sediment samples at local stream velocity from any point in an open channel flow. The system uses a flow-through Pitot tube as a combination velocity sensor and sampler nozzle. The main advantage of the sampling system over existing suspended sediment samplers such as the US-P series samplers is that a sample of any desired volume can be collected without changing the position of the sampler nozzle. To compare the performance of the system with that of other samplers, suspended-sediment samples were collected from a flat-bed flow using the system, a US DH-48 sampler modified for point sampling, and a siphon sampler. On the basis of these samples, at the 99% confidence level, the relative percent difference between the concentrations of the samples from the system and the siphon sampler was between -5.45 and 4.45 and the relative percent difference between the concentrations of the samples from the system and from the US DH-48 was between -0.54 and 7.78.

Subject Headings: Suspended sediment | Open channel flow | Siphons | Stream channels | Fluid velocity | Water flow | Probe instruments

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