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Abstract
This paper presents experimental and numerical studies of the evolution of dam-break driven wave on a horizontal smooth bed and its implication to sediment transport. Laboratory experiments are carried out using high-speed video images in order to obtain the spatio-temporal evolution of the free surface. Furthermore, a numerical model based on the two-dimensional-vertical Reynolds-averaged Navier–Stokes equations, with a k−ϵ turbulence closure and a volume of fluid method, is validated with the laboratory observations. The numerical model is shown to accurately predict the measured free-surface profiles, the wave-front velocities, as well as the impingement location of the first forward breaking jet. In order to bring more insight on dam-break wave induced erosion, the numerical model is extended for simulating suspended sediment transport. Model results suggest that the maximum bed-erosion occurs at the gate location and it moves farther downstream depending on the ratio between the downstream and the upstream water depth.
Funding
The authors would like to acknowledge the financial support from National Science Council of Taiwan under grant no. NSC 101-2923-E-006-006MY3. ATF acknowledges the support by the National Council of Science and Technology of Mexico (grant CB-167692).