NUMERICAL SIMULATION OF LEVEE BREACHING DUE TO OVERTOPPING FLOWS CONSIDERING THE EFFECT OF PRESSURE GRADIENT NEAR A BED

Abstract

 Recently, levee breaching due to overtopping flows which causes severe damage in residensial area is reported, and for disaster mitigation it is of great importance to understand the mechanism of breaching process in terms of flows and sediment transport, and consider countermeasures. In this study, a numerical model is refined by considering the effect of pressure gradient near a bed in the sediment transport model, and applied to the hydraulic experiment of levee breaching. Comparing the numerical results, it is shown that erosion at the toe of embamkment is slightly simulated by considering the effect of pressure gradient.