META-F: um modelo de otimização qualiquantitativa para operação de sistema de recursos hídricos de poluição fluvial.

Abstract

The brazilian rivers run across the cities and agricultural and cattle fields while getting polluted. The modeling and analyses of natural and manmade effects in water quality are, usually, associated with simulation techniques. However, this technique does not prioritize optimum water allocation. This paper presents the META-F: Modelo de Enquadramento Tático das Águas Fluviais (Fluvial Waters Tactical Quality Framing Model) for optimum water quality and quantity allocation at monthly level, via sequential linear programming, where the objective function aims the satisfaction of meeting goals to the water quantity demands and fluvial water quality requirements and the restrictions represent the physical and operational limitations of the hydraulic components behavior in a water resources system. The intrinsic non-linearities of each component processes had been implemented through an iterative procedure, making use of linear approaches. The model was applied to part of the Capibaribe river stream flow, located between the Jucazinho and Carpina reservoirs, in Pernambuco state, Brazil, where there are three irrigated perimeters, two human supply and industrial demands and two reservoirs. The behavior of the system was analyzed using an average climatic data in three scenarios: for the average inflow concentration of BOD in two cases, with and without the requirement of fluvial water quality requirement goal, and, finally, with the maximum inflow concentration of BOD. The results have shown the model efficiency as well as the viability of applying linearization techniques to non-separable variables. Still, the difference of attained operation policies for the reservoirs in the three scenarios can be clearly observed. Moreover, the robustness of the algorithm can be observed when it a solution for the system is achieved even when its setup does not generate a variable space that satisfies the water quality requirements