The impact of a two dimensional flood current against single or bunched obstacles has been widely investigated experimentally as well as numerically in the last years, also in the framework of EU project ( IMPACT -Investigation of Flood Processes and Uncertainties). The authors applied a first order upwind numerical solver (Roe scheme) to investigate if a lower order of accuracy solver could give comparable results to the one published by Mirei Shige and Juichiro Akiyama. The simulations show that the first order solver succeeds in reproducing the wave front steepness. This can be emphasised by refining the computational grid.
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