Risco de eutrofização em reservatórios de regiões semiáridas com uso da teoria dos conjuntos difusos

Abstract

This research has as mean subject the development of a methodology to calculate the risk of eutrophication in a reservoir, based on fuzzy set theory and the mechanisms used for the determination of the modified trophic state index (TSIM). Thereunto, it was used data from a reservoir, in the state of Ceará, Brazil, especially in years 2001 through 2006. These data were obtained through the Company of Water Resources Management – COGERH. To calculate the risk it was used membership functions of the modified trophic state index, transformed according to the rules of fuzzy numbers. The results have shown that the use of the fuzzy set theory could be important tool in order to calculate the risk of eutrophication for reservoirs and bring some help in the water resource management concerning with water quality problems.