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<br />CONTENTS <br /> <br />Abstracl 1 <br />Introduction 1 <br />Acknowledgments 2 <br />Bedload.sampler calibration facility 2 <br />Bedload trap and recirculation system 2 <br />Control and data-acquisition systems 3 <br />Tested bedload samplers 3 <br />Experimental procedure 5 <br />Hydraulic and sedimentologic data 7 <br />Sampled bedload. transport rates 8 <br />Measured bedload-transport rates 9 <br />Particle. size distributions 9 <br />Measured bedload transport 12 <br />Sampled bedload transport 14 <br />Water discharge 20 <br />Water-surface slope 20 <br />Longitudinal streambed-surface elevation 22 <br />Streambed slope 24 <br />Energy slope 26 <br />Depth 26 <br />Fixed-location streambed-surface elevations 27 <br />Summary 27 <br />References cited 30 <br />Metric conversion factors 31 <br />Availability of data Inside back cover <br /> <br />FIGURES <br /> <br />l. Schematic diagram of bedload-sampler calibration facility 3 <br />2. Schematic views of A, Sediment-recirculating system and B, Automated weigh. <br />pan system 4 <br />3-10. Photographs showing: <br />3. End view of weigh pans withdrawn from the trap 5 <br />4. Downstream view of sediment trap, weigh-pan support structure, and load <br />cells 5 <br />5. Enclosed instrument console with weigh-pan-control, data-acquisition, and <br />master-time systems 5 <br />6. Helley-Smith bedload samplers having standard nozzles 6 <br />7. Helley-Smith bedload samplers having modified nozzles 6 <br />8. A, Amhem bedload sampler and B. Full-scale VUV bedload sampler 7 <br />9. Mobile sampling platform 7 <br />10. A, Sample.weighing apparatus and B, Measurement cart 9 <br />J 1-18. Graphs showing cumulative relative-frequency distribution of bedload-transport <br />rates from samples collected with: <br />II. Helley-Smith sampler no. I 11 <br />t2. Helley'Smith sampler no. 2 11 <br />13. Helley-Smith sampler no. 3 11 <br />14. Helley-Smith sampler no. 4 11 <br /> <br />Contenls III <br />