2020 Volume 76 Issue 2 Pages I_411-I_422
Similarities of hydraulic model experiments for river including seepage flow through saturated porous riverbed materials, are investigated here based on the governing equations of numerical model. With the theoretical and computational results, it is shown that more attention should be paid to keeping consistency with Froude number similarity. 1/N Scaled physical roughness heights of river bed are required to satisfy Froude similarity for river flow, 1/N scaled groundsill and grain size are required to satisfy Shields number similarity for bed load, 1/1 or 1/√N scaled permeability is required to satisfy partial similarity or Froude similarity as river flow. The similarities at boundary roughness and grain size will be lost due to a too small scale 1/N. and, a 1/1 scaled permeability under small scale 1/N experiment may lead the river flow reduces due to relative bigger seepage flow.
