Abstract
Based on a numerically-generated boundary-fitted orthogonal curvilinear coordinate system, a 2-layered, 2-d mathematical model for unsteady flows with complicated boundaries is presented. It is employed to evaluate the change of flow patterns such as water surface level, velocity vector, Lagrangian pathline and friction factor in sinegenerated meandering compound channel in terms of water depth ratio between in main channel and in flood plain. It is concluded that the over-bank flow is impacted severely by the meandering main channel flow when the flow depth on flood plain is shallow, and is almost independent of that when hu/hi is greater than 0.9, except the super-elevation of water surface due to the meandering in-bank flow. The bulk friction factor (for f/8Cf, ) changes with hu/hi very interestingly.
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