Laboratory Calibration of Impact Plates for Measuring Gravel Bed Load Size and Mass
Publication: Journal of Hydraulic Engineering
Volume 143, Issue 12
Abstract
Continuous monitoring of gravel transport in rivers is necessary for understanding the effect of dam removal on river systems. Impact plates, such as those deployed on the Elwha River in the state of Washington, are a promising technique; however, relating the data generated by the plates to sediment load is difficult. In order to refine methods described in a recent study, coarse bed load transport was measured in a laboratory channel and compared to the output from two accelerometer-equipped impact plates that were full-scale replicas of 72 plates deployed in the Elwha River. Relations were developed for converting the signal amplitude generated by particles impacting the plates to particle mass. Mean discrepancy ratios indicate that estimates of coarse bed load transport were within 25% of the measured values if one outlier from the experiments was removed. Methods to transfer these relations to field locations are also discussed.
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Published In
Journal of Hydraulic Engineering
Volume 143 • Issue 12 • December 2017
Copyright
©2017 American Society of Civil Engineers.
History
Received: Jan 9, 2017
Accepted: Jun 23, 2017
Published online: Oct 16, 2017
Published in print: Dec 1, 2017
Discussion open until: Mar 16, 2018
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