Simulação biofisicoquímica em reservatório tropical polimítico

Abstract

Lobo reservoir is located in the state of São Paulo and it is a dynamic system where happens a diurnal cycle of mix and stratiphication as seen in other tropical lakes. 3D computational simulation where used. ELCOM (Estuary and Lake Computer Model) and CAEDYM (Computacional Aquatic Ecosystem Dynamics Model) both created by CRW (Center for Water Research) from Australia University to simulate biophysicochemicalls conditions in the reservoir. Five simulations had been carried through: Pilot Spring based in real data for the station spring of the year 2007 in the reservoir; Spring-P where the concentrations of total phosphorus, inorganic phosphate and dissolved total phosphate had been increased in 100% in the reservoir (water column and sediment) and in the tributaries rivers; Spring-V in which the intensity of the winds was increased in 50%; Spring-T where the temperature in the water (reservoir and tributaries) and in the air where increased in 10C and, Simulation Spring-X where the concentrations of total phosphorus, inorganic phosphate and dissolved total phosphate had been increased in 100% in the reservoir (water column and sediment) and in the tributaries rivers, the intensity of the winds was increased in 50% and the temperature in the water (reservoir and tributaries) and in the air where increased in 10C. The concentrations of chorophyll a where represented by the groups: cyanobacterias and chllorophyceas. The time space of the simulations represented 90 days. The chllorophyceas presented bigger populational development in all simulations. In the reservoir, a vertical mix happens every day because of the wind or by convective process caused by the lost of temperature in the water. The oxygenation in the reservoir is bigger whit the occurrence of winds and photosynthetic groups. The total concentrations of nitrogen and phosphorus in all simulations presented increasement.