Abstract
For evaluating distribution of flows and river bed deformation in a compound meandering channel, a three dimensional numerical model was developed. In this model, the boundary fitted curvilinear system (ξ, η, σ) and the spectral method are used for computing the distribution of flows, water surface and bed variation and hydrostatic pressure was approximated. In this paper, applicability of this hydrostatic pressure model to an analysis of riverbed deformation was examined through comparing with hydraulic experiments in a physical model. In the results obtained from the hydrostatic pressure model, scouring occurred at the outer side of river bend where flow concentrated. But, this scouring didnt occur in experiments. Therefore, it was considered that the use of hydrodynamic pressure model was necessary for evaluating the bed deformation in a compound meandering channel.
