Abstract
Abstract A simple model of nutrient cycling and oxygen consumption presented using System Dynamics as the modelling and simulation technique. This model, although inappropriate for the design of specific engineering solutions for the arrest of eutrophication in a particular lake, does illustrate the transition from oligotrophy to eutrophy in simple, conceptual terms. The accelerated depletion of oxygen in cultural eutrophication is apparent in simulations of the model, but can be arrested by diversion of nutrient effluents around the lake, dredging detrital sediments, or harvesting algal biomass. The failure of solutions which do not remove nutrient elements in some form is explained using systems concepts.
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