Oct 21, 2016 · The depth datum should be defined such that the streamwise velocity distribution is best fitted by the Nikuradse logarithmic law, of which the power function profile is an approximation. In the case of a bed of spheres, the datum is in the range of 0.15d to 0.3d below the crests of the spheres. 5 5. I. Nezu and H. Nakagawa, Turbulence in Open ...

### Eq smithing guide

Channel-flow model. For certain classes of channel flow, conditions are such that the momentum equation can be simplified to the form shown as Equation 54. (These cases are defined in Chapter 8.) In those cases, the kinematic-wave approximation of Equation 58 is an appropriate model of channel flow.