Lakes are in a continuous state of change. Some changes occur over
very short periods of time on the order of hours and minutes. Other
changes mark long-term trends in the biological and physical condition of a
lake. Among the long-term trends in many lakes are a decrease in depth
and an increasing productivity in a process called eutrophication.
Typically, eutrophication occurs over a time scale of centuries. However,
man-made changes to the watershed of a lake may result in a rapid acceleration
of eutrophication such that significant changes in the water quality
of the lake are noticed in a time span of a few years. Anthropogenic acceleration
of eutrophication, known as cultural eutrophication, is due to
agricultural, urban, and recreational development in the watershed of a
lake which causes an increase in the nutrient loading to a lake.
Riley, Michael J.; Stefan, Heinz G..
Dynamic Lake Water Quality Simulation Model "Minlake".
St. Anthony Falls Hydraulic Laboratory.
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