Influence of river meandering on the Tagliamento floods

In this paper is presented a bi-dimensional approach to the study of flood of the Tagliamento River in the presence of meanders. It deals with a 2D depth-averaged numerical model based on conservative form of De Saint Venant equations. A finite volume method is used to solve non linear equations by a Godunov approach supported by a robust and efficient approximate solver proposed by Harten, Lax and van Leer (HLL). First, we show the ability of the model to understand the variations in the level of cross-curve due to centrifugal acceleration. To this end, it is shown a comparison between the experimental results of Shukry (1950) and similar numerical simulations. Following is discussed behaviour levels in the meanders of low Tagliamento during the flood event of 4 November 1966.