A comparison between computed and measured bed evolution in a river bendby L. Montefusco, Universita degli Studi di Firenze, Firenze, Italy,
A. Valiani, Universita degli Studi di Firenze, Firenze, Italy,
Abstract: A shallow-water scheme with a movable bed has been employed in order to check the reliability of computations related to the bed evolution when a substantially three-dimensional phenomenon is present. The complete research program includes several laboratory experimental tests, as published data are generally not sufficiently complete to result suitable for a detailed comparison. Here only a first stage of the research is presented. In this paper a bend is considered, and shallow-water equations are solved in a polar coordinate system (the scheme is two-dimensional). A partially new numerical finite-difference technique has been developed, which seems to be specially robust, avoiding a staggered grid and allowing very long simulations. The results seems to be rather discouraging, as the scheme (at least in its more elementary version) seems not to be able to represent, even qualitatively, the experimental bed evolution.
Subject Headings: Shallow water | Flow measurement | Comparative studies | Numerical models | Channel bends | Three-dimensional flow | River flow | Water flow
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