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By J E ABBOTT AND J R D FRANCIS
STATISTICS OF TRAJECTORIES
STATISTICS OF IMPACTS
acceleration additional analysis angle appear averaged Bagnold boundary carried cause chance changes coefficient compared component considered constant crest curve decrease defined definition density dependent depth determined directed distance distribution drag force effect equation experimental experiments falling figure figure 11 fixed flash flow fluid follows Francis frequency function further given gives gravity greater height higher horizontal velocity images impact impulses increase intervals larger length less lift force limit lines lower main series mean measured mode motion moving grain observed occurs parameter particles photographs plotted points positions present Professor range record reference relative rest rolling runs saltations scale seen shape shear drift shear velocity similar smaller Society solid stage started statistics stream stream depth suspensive trajectories technique thrust transport turbulence upward values vertical water stream ymax