## Transport behaviour of solids

# Transition from bed load to sediment load transport

With increasing turbulence and flow velocity, particles (solids) of varying size and density can be brought into suspension, with a decrease in velocity the particles settle to the bottom of the channel. This approximate relationship can be shown through the FROUDE number of particles equation:

v = flow velocity [m/s]

d = particle diameter [m]

g = gravitational acceleration [m/s

^{2}]

Research by [Kress1964] has shown that a particle floats when Fr* > 19 and sinks when Fr* < 19, resulting in the limiting grain diameter equation:

v

_{m}= average flow velocity

d

_{gr}= limiting particle diameter

g = gravitational acceleration