流体力学A

[S04A-01] On the Similarity of a Hydraulic Model Experiment for A River Including Seepage Flow through Saturated Porous Riverbed Materials

*Hongxuan YANG¹, Yutaka FUKUMOTO¹, Tokuzo HOSOYAMADA¹, Satoru OHTSUKA¹ (1. Nagaoka University of Technology)

Keywords:hydraulic model experiment, Froude number similarity, Shields number similarity, permeability

Similarities of hydraulic model experiments for river including seepage flow through porous riverbed materials, are investigated here based on the governing equations. 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/sqrt(N) scaled permeability is required to satisfy partial similarity or Froude similarity as river flow.