ON A FALL-VELOCITY-FREQUENCY ANALYSIS OF SEDIMENTS WITH A DIFFERENTIAL PRESSURE GAGE

In studying mechanics of transportation of sediments by stream, it is desirable to know fallvelocity frequency distribution rather than size frequency distribution of sediments. Usual methodsfor observing characteristics of sediments are mainly for size frequency analysis of granularparticles as minute as Stokes' law applicable. Differential pressure gages are already utilized forthe sedimentation test, but its applicability is limited within granular particles and is not completelyclarified yet. The authors performed some experiments on the applicability of this method toconsiderable coarse particles as gravels in a mountain stream and the limit of applicability isclarified based on the experimental results.