Abstract
First-and second-order accurate 2D numerical models based on finite-volume method for flood flows are developed. The models employ unstructured grids so as to handle a complicated floodplain geometries. The first-order accurate model uses FDS technique. The second-order accuracy, in space and time, is obtained by using MUSCL technique and predictor-corrector time integral sequence in the first-order model. The models are verified against experimental data of dam-break flow in converging-diverging channel as well as 2D flood wave due to partial dam-break under dry-bed condition. The first-order accurate model may be preferred for practical applications when computation time and overall accuracy are considered.
