Flood Wave Modification Along Prismatic Channels

by Giampaolo Di Silvio,

Serial Information: Journal of the Hydraulics Division, 1969, Vol. 95, Issue 5, Pg. 1589-1614

Document Type: Journal Paper


The general behavior of a flood wave propagating along a prismatic channel is examined. It is pointed out that attenuation is not always to be expected, and a criterion for discriminating attenuation and amplification of flood waves is stated, that is quite similar to the analogous criterion deduced by many authors for infinitesimal perturbations. An approximate procedure for flood waves that are approximately fitted by a triangular shape is developed; a set of nondimensional graphs is deduced which may be used to predict the modification with respect to time of a triangular wave in dependence of two parameters called attenuation and distortion-coefficient. A simple formula is suggested to calculate peak attenuation or amplification, which does not depend on the distortion coefficient. Comparisons with experimental tests are referred to in the last section and seem to be quite satisfactory. Some auxiliary elements are given for facilitating computations in part-full circular pipes.

Subject Headings: Floods | Wave attenuation | Distortion (structural) | Wave propagation | Parameters (statistics) | Comparative studies | Computing in civil engineering | Pipes

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