Abstract

A two-dimensional hydrodynamic and morphologic numerical model has been developed herein. The model solves depth-averaged two-dimensional flow and sediment transport equations. A numerical technique referred to as Cubic Interpolated Pseudo-particle (CIP) method has been used to solve advection phase of momentum equations. The equations have been resolved in non-orthogonal general coordinate system, so called, boundary fitted coordinate. Attempt has been made to replicate numerically the flow and morphological evolution in laboratory scale, in turn, substantiated with physical observations. Firstly, the model has been employed to reproduce flow and vorticity field induced by the spurs placed in a laboratory channel. Secondly, morphologic evolution in some sine-generated channels has been simulated and verified against physical experiments. Finally, some numerical experiments have been conducted in order to evaluate qualitatively the structure-induced morphological changes in a circular meandering-like laboratory channel with spurs. Prediction capabilities of the numerical model have been found to be promising. Proposed numerical model might be implemented in real-world problem of river engineering practice.

Keywords: Depth-averaged numerical model, river structures, river flow and morphology, meandering channel