Comparison of estimated and experimental subaqueous seed transport



We compare the estimates from the relative bed stability (RBS) equation that indicates incipient bed movement, and the inertial settling (‘Impact’) law and Wu and Wang (2006) settling velocity equations that indicate suspended particle movement, to flume and settling velocity observations to confirm the utility of the equations for subaqueous hydrochory analyses, and to calibrate our estimates by examining the method by which seed volume is obtained. Comparison of the observed measures with the estimates of the inertial settling (‘Impact’) law and RBS equations indicate that these two equations appear to provide reasonable approximations of the velocities required to achieve transport both in suspension and on the bed, respectively. The use of the water displacement method for volume measurement is a technologically simple method for improving the accuracy of the estimates. Copyright © 2011 John Wiley & Sons, Ltd.