Author(s): Weiming Wu; Meng Wang
Linked Author(s): Weiming Wu
Keywords: Dam breach levee breach one-dimensional numerical modelling Riemann solver
Abstract: A 1-D physically-based model has been developed to simulate the earthen embankment breaching processes due to overtopping flow. The model approximates the cross-section of the breach channel as a trapezoid. The model solves the generalized 1-D shallow water equations for the unsteady sediment-laden flow in the breach channel and uses a non-equilibrium transport model of total-load sediment to simulate the breach evolution. The governing equations are solved using an explicit finite volume method with the HLL approximate Riemann solver. Different erosion models are used to determine the entrainment of noncohesive and cohesive sediments. The water levels in the upstream and downstream water bodies are calculated with the water balance equation and used as boundary conditions for the breach channel model. The developed 1-D model has been tested using many cases of embankment breaching. The model performs reasonably well.
Year: 2025