A NEW CALCULATION METHOD FOR LOCAL THREE DIMENSIONAL FLOWS BY USING THE NON-HYDROSTATIC DEPTH INTEGRATED MODEL (BVC METHOD) WITH DYNAMIC WALL-LAW FOR ROUGH BED

Abstract

 The general Bottom Velocity Computation method (BVC method) has been proposed to calculate vertical velocity and pressure distributions within the frame work of two-dimensional computation method to evaluate multi-scale phenomena of flood flows. This paper derived the dynamic rough wall law (DWL) composed of continuity and momentum equations for vortex and roughness layers and developed BVC-DWL method to take into account non-equilibrium fluid motions and flow exchanges near the bed in the BVC method. The applicability of the BVC-DWL method was discussed for flows with relative roughness scales and shallowness parameters based on the momentum equations for DWL. The adequacy of the BVC-DWL method was indicated through the applications to three dimensional flows around structures in the laboratory and field experiments.