Laserfiche WebLink
<br />. <br /> <br />34 <br /> <br />them, the Meyer-Peter, Muller (MPM) equation is a simple and commonly used <br /> <br />bed-load transport equation for fine and medium sand-bed channels; the Einstein <br /> <br />. <br /> <br />method is one of the most widely recognized methods used to compute suspended <br /> <br />sediment loads. With the integration of these two methods, the estimation <br /> <br />of total sand transport capacity can be made. <br /> <br />. <br /> <br /> 2.5.3.1 The Meyer-Peter, Muller Equation <br /> The equation is <br /> 12.85 (, , )1.5 <br /> qb = - <br /> ~y 0 c <br /> s <br />in which, <br /> , = (1/8) pf V2 <br /> 0 0 <br /> , = F. (ys - y) 0 <br /> c s <br /> <br />. <br /> <br />(2-10) <br /> <br />. <br /> <br />(2-11) <br /> <br />(2-12) <br /> <br />. <br /> <br />where, qb = the bed-load transport rate in volume per unit width for a <br />specific size of sediment, <br /> <br />'0 = the boundary shear stress acting on the grain, <br /> <br />'c = the critical tractive force necessary to initiate particle <br />motion, <br /> <br />. <br /> <br />p = the density of water, <br /> <br />ys = the specific weight of sediment, <br />F. = the dimensionless shear stress depending on flow conditions, <br /> <br />. <br /> <br />D = the size of sediment, <br />s <br /> <br />f = the Darcy-Weisbach friction factor (usually assumed 0.066), <br />o <br /> <br />. <br /> <br />v = the mean flow velocity. <br /> <br />The equation is based on the theory of beginning of motion and the tractive <br /> <br />force exerted by the flow on the bed of a channel. <br /> <br />The value of <br /> <br />F <br />. <br /> <br />can be <br /> <br />. <br /> <br />found from Shields' diagram presented in Figure 2-9. In the diagram, R. <br /> <br />. <br />