The effect of tilt on sediment trap efficiency
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Cylindrical traps with an aspect ratio of 5.2 were tilted from 0° to 70° upstream and downstream in the Hudson River with currents ranging between 2 and 62 cm s-1. Particle flux in the tilted traps increased with tilt up to about 45° where overcollection reached a maximum factor of three but decreased beyond 45° when traps were tilted downstream. There was no discernible velocity effect on the total flux collected with tilted traps. In a recirculating flume, dye used as a water tracer revealed the existence of boundary layers within traps. The exchange of particles across the boundaries appears to play an important role in controlling the collection rate of particles and the conditions during which traps over- and under-collect particles. The tilt effect on traps is important, not only where high velocities can cause a mooring to lean, but also where high-frequency internal waves might pass either moored or freefloating traps since the vertical velocity component of an internal wave can cause an effective tilt of the traps. © 1985.
Deep Sea Research Part A. Oceanographic Research Papers
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