A Bidimensional Model of the Tagliamento River


Type: Link Language: English Author: Marco Petti, Silvia Bosa, Sara Pascolo

The propagation of a flood wave is a very challenging topic, crucial in managing the
flood risk. In the literature, several numerical models have been proposed to deal with this issue;
most of them need the roughness coefficients to be assigned by the operator. The bottom
roughness calibration of floodplains and channels represents a key point for flood studies,
because it can heavily influence the results of any kind of numerical simulation. In this study, a
numerical model is applied to the Tagliamento River, in North-East Italy. One of the main
characteristics of this river is its natural environment, which changes from a very wide braided
channel in the middle course to a narrow meandering river moving towards the sea. This makes
the bed roughness extremely variable along the river, with different kind of vegetation, braiding,
different grain size, meandering, etc. In this regard, particular care should be devoted to the
roughness coefficient attribution and calibration. In the present paper, we present the detailed
step of calibration and validation of a bidimensional numerical model on the Tagliamento River.
A novel method to assign and calibrate roughness coefficient is introduced. Finally, the model
is validated against two main flood events occurred in 1966 and 1996

Keywords: hydrological model, flood, hydrograph, model

View entry