Numerical modelling of dam failure due to flow overtopping

A one-dimensional numerical model for Jam failure due to flow overtopping i s developed. Thr MacCormack explicit finite difference scheme is used to so lve the one-dimensional equations of continuity and momentum for unsteady v aried flow over steep bed slopes. In the computation of erosion process. se diment transport equations are considered and the modified Smart formula de veloped for steep bed slope is selected. The sliding stability of the overt opped dam is checked by modified ordinary method of slices. The model has b een successfully calibrated and verified using laboratory experimental data . By comparing with the experimental results, it was found that the model a ccuracy depends largely on the sediment transport formula and pore water pr essure coefficient. The model was found to predict actual breach outflow of the Buffalo Creek Dam reasonably well and closer than other existing numer ical models.