Abstract

Sediments caught in two pit traps installed in Harris Creek, a small gravel-bed stream in southern British Columbia, were sieved to give five size fractions between 53 and 425 μm, which were then separated into their magnetic and nonmagnetic components. Estimates of transport-equivalent sizes of the higher density magnetic fractions were obtained by determining the grain sizes of magnetic and nonmagnetic particles that enter the traps at proportionally similar rates for a wide range of discharge conditions. The estimates of transport-equivalent sizes are compared with settling-velocity equivalents from settling-tube data. Each heavy-mineral size fraction is transported at a rate similar to a specific larger size fraction, which is approximated by the equivalent settling diameter of particles of lower density.

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