New Approach to Calibrating Bed Load Samplers
Publication: Journal of Hydraulic Engineering
Volume 111, Issue 4
Abstract
Cyclic variations in bed load discharge at a point, which are an inherent part of the process of bed load movement, complicate calibration of bed load samplers and preclude the use of average rates to define sampling efficiencies. Calibration curves, rather than efficiencies, are derived by two independent methods using data collected with prototype versions of the Helley‐Smith sampler in a large calibration facility capable of continuously measuring transport rates across a 9 ft (2.7 m) width. Results from both methods agree. Composite calibration curves, based on matching probability distribution functions of samples and measured rates from different hydraulic conditions (runs), are obtained for six different versions of the sampler. Sampled rates corrected by the calibration curves agree with measured rates for individual runs.
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Published In
Journal of Hydraulic Engineering
Volume 111 • Issue 4 • April 1985
Pages: 677 - 694
Copyright
Copyright © 1985 ASCE.
History
Published online: Apr 1, 1985
Published in print: Apr 1985
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