Vollenweider model with primary production
Simple mass balance model for lakes, based on the Vollenweider equation:

dMw/dt = Min - sMw - Mout

The model was first used in the 1960s to determine the phosphorus concentration in lakes and reservoirs, for eutrophication assessment.

This version uses nitrogen and adds phytoplankton growth based on a Michaelis-Menten equation

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