Reverse Flood Routing in Rivers

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Tuesday 30 june 2015

12:30 - 12:33h at Europe 1 & 2 (level 0)

Themes: (T) Water engineering, (ST) Computational methods, Poster pitches

Parallel session: Poster pitches: 5E. Engineering - Computional

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A procedure for reverse flood routing in natural channels is proposed for ta river reach where lateral flow are significant. The procedure considers only the downstream channel end as a gauged site. The channel ends topography is given known. The developed model has basically four components: (1) the inflow hydrograph is expressed by a Pearson Type-III distribution, involving parameters of peak discharge, time to peak, and a shape factor; (2)the basic continuity equation for flow routing written in the characteristic form is employed; (3) the lateral flow is related to stages at channel ends. (4) the relation between local stages and remote discharges as found by Moramarco et al.(2005) is exploited. The parameters, coefficients and exponents of the model were obtained using the genetic algorithm method. River reach along the Tiber River in central Italy is used to validate the procedure. Analysis are carried out for three significant flood events occurred along the river and where the lateral flow was significant. Results show the good performance of the procedure. Specifically, the discharge hydrographs assessed at channel ends are found satisfactory both in terms of shape with a Nash Sutcliff ranging overall in the interval (0.755-0.972) and in the reproduction of rating curves at channel ends.