Abstract
A current‐activated sediment trap is described that collects particles based on preselected current speed and direction criteria. The collector incorporates a steep‐walled funnel, a motor‐driven carousel with sample cups, an absolute optical shaft encoder, and an acoustic current meter. A field trial of the trap was carried out in a shallow marine embayment over 3 d where it correctly positioned cups in response to tidal changes in current speed and direction. Particle organic content and sedimentation rates calculated over hourly intervals were similar to measurements with a standard sequential sampling trap over several hours when the two traps were deployed simultaneously.
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