Engelund & Hansen Transport Theory

The dimensionless rate of total-load transport F_t is calculated as

(5.24)   

with C = Chezy’s number and

(5.25)   

with q_t = the total-load sediment transport and g = gravitational acceleration. The dimensionless bed shear stress q is defined as

(5.26)   

where U_f is the shear velocity related to total friction, d is the grain diameter and s is the relative density of the bed material.

This formulation assumes that the dimensionless bed shear stress q is much larger than the Critical Shields Parameter for initiation of transport q_c. There­fore, the value of q_c specified by the user will not be applied if this formulation has been chosen. Something similar applies to the gradiation of the bed material, since Engelund & Hansen theory is based on the median grain size d₅₀.