Abstract
When a flow over backward-facing step or consolidation work includes both subcritical and supercritical flows, a very complicated local scouring is generated by interaction of a wave jump and a submerged jet at the downstream of these structures. Since the local scouring decreases the stability of these structures, it is a very important problem on disaster prevention. In this paper, we present a 2-dimensional numerical model which can reproduce the local scouring by the complex flow over backward-facing step. The numerical model is based on the MacCormack scheme, and the FAVOR method is introduced into the basic equations. A bed load and a suspended load are taken into consideration by the bed evolution model. The numerical results reproduce the local scouring by repetition of each flow well.
