Numerical and Experimental Study of Levee Breach

Monday, 15 December 2014
Ezzat Youssef Elalfy, Lindsey LaRocque, Cyrus K. Riahi-Nezhad and Hanif Chaudhry, University of South Carolina Columbia, Columbia, SC, United States
Levees are constructed along rivers and channels for flood protection. Failure of these levees can cause loss of life and property damage. A better understanding of the flow field from a levee breach allows the decision maker to assess risks and to prepare emergency plans. For this purpose, a two-dimensional numerical model is developed to simulate the levee breach. The model solves the shallow-water equations using the MacCormack explicit, finite- difference two-step, predictor-corrector scheme. The scheme is second-order accurate in time and space. The artificial viscosity technique is used to smooth the high-frequency oscillations in the computed results. The numerical results compare satisfactorily with the experimental results. A parametric study is carried-out to investigate the effect of main channel width, breach width on the computed flow field.