Bedload Transport Measurement by Imaging of Tracersby Edith L. Gallagher, Univ of California, San Diego, United States,
Richard J. Seymour, Univ of California, San Diego, United States,
David B. King, Jr., Univ of California, San Diego, United States,
Abstract: A dyed-sand tracer technique is developed for investigation of bedload under laboratory oscillatory flows. Imaging of the tracer with high speed photography allows the creation of time series of bedload speeds which can be correlated directly with concurrent fluid velocities. Maximum depths of motion are recorded for each experiment using paraffin casts to stabilize the sediment for measurement. Computer imaging techniques are developed to objectively measure sediment concentrations in the down channel direction. Although preliminary, the methods appear to hold promise for establishing quality data sets against which both bedload models and bedload sensors can be tested.
Subject Headings: Bed loads | Probe instruments | Sediment transport | Photography | Fluid velocity | Data processing | Flow measurement
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