survey of shape factor effects in fall velocity of individual particles in to sedimentary flows

ABSTRACT: the fall velocities of sedimentary particles are important variants in estimate of sediment rate of wash load and bed load. this parameter has an important role in designing and physical modeling of settling pools, so that estimating the exact rate of it, is very important and if the exact estimating not to be done, it can be caused of much errors to estimate sediment stilling or designing of sedimentary pool. in this research, with classification of sediments in four different shape factors (sf=1, 0.7?sf?0.8, 0.5?sf?0.6, 0.2?sf?0.3) and three size of sedimentary particle (1 inch, 0.5 inch, 3/8 inch), the effect of shape factor on fall velocity obtained with measuring of fall velocity of particles in certain denseness classification (dense 2.18 gram in a liter, dense 5.32 gram in a liter and dense 14.24 gram in a liter). then with exploration of dimensionless equations and with obtaining the results of fall velocity for different categories of particles, profiles and tables (charts) plotted and finally relations for fall velocity of sedimentary particles were obtained.