Sedimentation and time-of-transition techniques for measuring grain-size distributions in lagoonal flats: comparability of results

A comparative study was performed of three instruments used to measure the grain-size distribution of thirty sediment samples from shallow lagoonal flats: the hydrometer, the Sedigraph 5100 and the CIS-1. The hydrometer and Sedigraph are based on sedimentation whereas the CIS-1 uses the time of transition. The percentage of the samples accounted for by the <8 lm fraction was not affected by the technique used, but this was not the case with the clay fraction (<2 lm). Due to its relative independence from the analytical method applied, the