Publications Details
Publications Details



Author: V. Bellos and V. Hrissanthou

Year: 2009

Publisher: European Water Resources Association (EWRA)


In this paper, the propagation of a flood wave after the break of a reinforced concrete dam is simulated numerically, assuming one-dimensional unsteady flow. Two algorithms were written in Fortran language. These algorithms are based on the full hydrodynamic equations of one-dimensional unsteady flow, using the numerical schemes Lax-Wendroff and MacCormack, respectively. In order to validate the simulation results, comparison with the experimental data published in the work of S. Soares-Frazao (2007) is made. The experimental set-up consists of a water tank that simulates the reservoir of a dam, followed downstream by a horizontal dry bottom section, a triangular bottom sill with high slopes and a small pool of water at rest that ends up in a vertical diaphragm. The algorithms can deal successfully with the simulation of the triangular bottom sill and the high
negative value of slope without any geometric simplification. The comparison of experimental and numerical data shows a high degree of convergence. The use of diffusion factor is favourable for the operation of numerical schemes that are unable to describe abrupt changes of hydraulic flow properties (velocity, water depth, bottom slope etc.). There is a weakness in describing the phenomenon of flood wave reflections on vertical diaphragms due to the supercritical flow conditions, in addition to the simultaneous formation of a hydraulic jump.