In the present work, a two-dimensional hydraulic model was used for the simulation of river flow and sediment transport at the downstream section of the Koiliaris River Basin in Crete-Greece based on two different structured grids. Specifically, an important goal of the present study was the comparison of a curvilinear grid model with a rectilinear grid model. The MIKE 21C model has been developed to simulate 2D flows and morphological changes in rivers by using either an orthogonal curvilinear grid or a rectilinear grid. The MIKE 21C model comprises two parts: (a) the hydrodynamic part that is based on the Saint-Venant equations and (b) the morphological change part for the simulation of bank erosion and sediment transport. The difference between the curvilinear and the rectilinear grid is that the curvilinear grid lines follow the bank lines of the river, providing a better resolution of the flow near the boundaries. The water depth and sediment results obtained from the simulations for the two different grids were compared with field observations and a series of statistical indicators. It was concluded that the curvilinear grid model results were in better agreement with the field measurements.
- curvilinear grid
- MIKE 21c model
- rectilinear grid
- river flow
- sediment transport
- First received 1 December 2016.
- Accepted in revised form 22 February 2017.
- © IWA Publishing 2017