Sales, Raquel Jucá de Moraes, authorAraújo, Juliana Alencar Firmo de, authorSantos, Silvia Helena, authorSouza, Raimundo Oliveira de, authorColorado State University, publisher2020-02-132020-02-132013https://hdl.handle.net/10217/201031http://dx.doi.org/10.25675/10217/2010312013 annual AGU hydrology days was held at Colorado State University on March 25 - March 27, 2013.Includes bibliographical references.A mathematical model based on the equations of hydrodynamics combined with the fuzzy set theory was formulated, for the flood wave propagation in natural rivers. The model is able to evaluate the behavior of the control variables as membership functions. For the solution of the model governing partial differential equations, the Finite Difference Method was used, and for the solution of the resulting system of nonlinear algebraic equations, the Newton-Raphson Iteration Method was used. The results show that the use of Fuzzy Set Theory in the Hydrodynamic model could be an available alternative to determination of the uncertainty and to the Fuzzy Risk Analysis in the flood wave propagation.born digitalproceedings (reports)engCopyright and other restrictions may apply. User is responsible for compliance with all applicable laws. For information about copyright law, please see https://libguides.colostate.edu/copyright.fuzzy set theoryhydrodynamic modelflood wave controlText