Modeling of Sediment Transport Conditions due to Dam-break

Numerical simulation of sediment transport has been conducted in two modes, namely one-layer and two-layer modelling. In one-layer approach, water surface and bed elevation variations due to dambreak have been modelled and in the two-layer approach, a second layer combining water and sediment has been added. Finite volume techniques, HLL, have been utilised for discretization of the relationships and a GIS tool has been added for enhancement of interpretations of the simulation results. Application of the one-layer model showed a good agreement in simulation of the wave front, shock waves and discontinuities. In the case of the two-layer model, sediment transport was shown to be the result of differences in the shear stresses in bed material, the sediment, the bed profile and water surface profile were accurately simulated. In comparison with experimental results, it has been shown that larger shear stresses in the bed than the sediment would result in sedimentation and inversely would result in erosion. Discontinuities and shock waves were accurately modelled. The model developed may be used to estimate the amount of sediment produced as a result of dambreak

کلیدواژه ها:

Sediment transport ، Dambreak ، GIS ، Numerical simulation