Modelling Stream Chemistry for the Turkey Lakes Watershed: Comparison with 1981–84 Data

Abstract

Simulation results obtained from interfacing a hydrological model with a hydrogeochemical model are used to explain the increase of Ca²⁺ + Mg²⁺, alkalinity, and pH in a progressively buffered stream system in the Turkey Lakes Watershed, Ontario. Results from the model, which were calibrated with observed data for 1981, were confirmed with those from 1982, 1983, and 1984. The results further supported the hypothesis that the increases of the groundwater input of Ca into the lower streams contributed to the increase of alkalinity and pH in the downstream lakes which appeared to have caused a corresponding increase in the biological primary productivity in these lakes.