NUMERICAL-MODEL OF FLOW IN ICE-COVERED CHANNEL

A two-dimensional numerical model for a dune-bed channel is extended t o describe the flow structure in a channel with a bed of prescribed ge ometry and roughness, and a free-floating ice cover of known roughness . The model involves solution of the Reynolds-averaged Navier-Stokes e quations with the k-omega turbulence model, which accounts for wall ro ughness. It is validated against recent experiments in channels with s imulated ice covers of varying roughness, and is applied to estimate t he effect of an ice cover on the flow in a dune-bed channel.