2D Finite Element Modelling of Flooding Due to River Bank Collapse

by L. D'Alpaos, Univ of Padua, Padua, Italy,
A. Defina, Univ of Padua, Padua, Italy,
B. Matticchio, Univ of Padua, Padua, Italy,



Document Type: Proceeding Paper

Part of: Modelling of Flood Propagation Over Initially Dry Areas

Abstract:

To compute the flood propagation over an initially dry area a new set of 2D equations has been recently proposed which accounts for the ground unevenness effects. The paper presents a 2D mathematical model which solves these equations by a staggered finite element scheme. The whole domain is divided into triangular elements. Water elevations are considered linearly varying between element nodes while velocities are considered constant over the element. The proposed model is applied to study the flood propagation along the Brenta river considering, in addition, a possible river bank collapse during the high stage. The influence of the threshold depth Y_lim upon the celerity of the front propagation over the dry area behind the broken bank is also investigated with the model.

Subject Headings: Finite element method | River bank stabilization | Mathematical models | Floods | Two-dimensional models | Mathematics | Computer models

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