Aplicação da teoria Fuzzy em um modelo matemático de transporte de massa bidimensional para estudar qualidade de água em rios naturais.

Abstract

In this research a methodology was developed through the combination of the Fuzzy Set Theory with the Principle of Mass Transport, in two dimensions, to study the behavior of the water quality in natural rivers. The water quality model is composed by the two-dimensional Dispersion Equation, with a dominant velocity in the longitudinal direction of the river. The application of the Fuzzy Theory in the transport model allowed that membership functions for the concentration were calculated along the river, as function of the hydraulic parameters and of mass transport parameters. Thus, with this studying it appears a possibility that a program of risk analysis can be incorporate in the proposed methodology, to determine the risk of failure of any water system, subject to an effluent release along its course. The results showed that the methodology proposed could be an real alternative for the study of the risk analysis in environmental engineering and, specifically, in the water resources engineering.