New approach to calibrating bed load samplers

Journal of Hydraulic Engineering
By: , and 



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.

Additional publication details

Publication type Article
Publication Subtype Journal Article
Title New approach to calibrating bed load samplers
Series title Journal of Hydraulic Engineering
DOI 10.1061/(ASCE)0733-9429(1985)111:4(677)
Volume 111
Issue 4
Year Published 1985
Language English
Publisher American Society of Civil Engineers
Publisher location New York, NY
Contributing office(s) Minnesota Water Science Center
Description 18 p.
Larger Work Type Article
Larger Work Subtype Journal Article
Larger Work Title Journal of Hydraulic Engineering
First page 677
Last page 694
Online Only (Y/N) N
Additional Online Files (Y/N) N
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