The failure of a major flood control structure may expose the surrounding population to serious risk. Such an event kind may involve rapid transients with strong interactions between flow and topography. Similar morphodynamical processes may then exhibit a behavior not explainable using the hypothesis of immediate adaptation of solid transport to flow condition. So, to correctly simulate the consequences of a dam failure in a complex topography, this interaction should be accounted for in mathematical modeling, which should however rely on physical descriptions that are not yet completely established. Within this framework, accurate experimental data in idealized cases are essential to clarify the process evolution and to validate mathematical and numerical models still in development. In the present paper, recent experiments realized in a channel with a sudden enlargement are used for comparing results of a morphodynamical model with an explicit dynamical description of sediment transport, against a classical Saint Venant – Exner model. Such an enlargement features some interesting particularities, with zones with highly curved flow filaments with high curvature and strong erosion and shadowed zones behind the enlargement.
2D-H Numerical Simulation of Dam-Break Flow on Mobile Bed withSudden Enlargement
LEOPARDI, Angelo;
2010-01-01
Abstract
The failure of a major flood control structure may expose the surrounding population to serious risk. Such an event kind may involve rapid transients with strong interactions between flow and topography. Similar morphodynamical processes may then exhibit a behavior not explainable using the hypothesis of immediate adaptation of solid transport to flow condition. So, to correctly simulate the consequences of a dam failure in a complex topography, this interaction should be accounted for in mathematical modeling, which should however rely on physical descriptions that are not yet completely established. Within this framework, accurate experimental data in idealized cases are essential to clarify the process evolution and to validate mathematical and numerical models still in development. In the present paper, recent experiments realized in a channel with a sudden enlargement are used for comparing results of a morphodynamical model with an explicit dynamical description of sediment transport, against a classical Saint Venant – Exner model. Such an enlargement features some interesting particularities, with zones with highly curved flow filaments with high curvature and strong erosion and shadowed zones behind the enlargement.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
