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You are here : eLibrary : IAHR World Congress Proceedings : 34th Congress - Brisbane (2011) : THEME 1: Extremes and Variability : Experimental study on flash flood waves down a stepped channel
Experimental study on flash flood waves down a stepped channel
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In the mountainous regions, flood waves resulting from frequent flash floods have been responsible for numerous damage and losses of life. In the present study, experiments were conducted to investigate surging waters down a dry, stepped channel, which was 2.4m long, 0.5m wide and with a slope of 0.133, for the cases of being roughed and non-roughed. Experimental data from the non-roughed series compared with Chansonís (2004) showed, for some smaller initial flow rate, the dimensionless wave front celerity would reduce as the flow rate decreased. For roughed series, it showed the large bed roughness had greatly consumed the energy of the flow and hence, delayed the flash flood propagation. Finally. an empirical expression of Darcy friction factor f considering both the distribution of the relative step height h* and the relative grain diameter D* was derived.
File Size : 344,873 bytes
File Type : Adobe Acrobat Document
Chapter : IAHR World Congress Proceedings
Category : 34th Congress - Brisbane (2011)
Article : THEME 1: Extremes and Variability
Date Published : 08/08/2012
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