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Flora-2D: A new model to simulate the inundation in areas covered by flexible and rigid vegetation

pubblicazioni - Articolo

Flora-2D: A new model to simulate the inundation in areas covered by flexible and rigid vegetation

E’ stato sviluppato un nuovo modello idraulico bidimensionale in grado di considerare la resistenza al moto dovuta alla vegetazione in funzione sia dello spazio che del tempo. Grazie al confronto con una immagine satellitare acquisita durante una piena del fiume Bradano del marzo del 2011 si è potuto effettuare una prima valutazione del buon comportamento del modello.

A two-dimensional (2D) hydraulic model for river flood inundation prediction is presented. This model named FLORA-2D (FLOod and Roughness Analysis) solves the shallow-water equation at each node of a regular mesh covering the channel and floodplain. Its special feature is the ability to consider the flow resistance due to vegetation as a function of both space and time. So, during a flood, in each grid node the resistance of vegetation is calculated considering the hydraulic characteristics of the current which may vary over time as well as the characteristics of the plant. The model was tested in a study of a flood event which occurred on the River Bradano, Southern Italy, in March 2011. A first evaluation of the behavior of the model shows a good correspondence with the theories used in the code. Furthermore a satellite image acquired during the flood provided an observed flood extent against which to compare the predicted extent.

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