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Exercise 1 ANSWER. Lake biomanipulation
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- Possible forcing function could be f1, the inflow of DIP
- Suitable units: mol P $m^{-3}$
- The effects of biomanipulation can be investigated by changing f10.
Exercise 2 ANSWER. Decay of particulate organic matter due to bacterial activity
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Note that respiration consists of two parts: basal respiration (a continuous process that occurs regardless whether bacteria grow or not), and growth respiration (linked to bacterial growth).
Exercise 3 ANSWER. Spread of the Corona virus
Basic SIR model
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SIR model with vaccination
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SIR model with the "British variant"
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The assumptions are:
- Immunity is gained for all variants whatever variant a person was infected with.
- Vaccination protects against all corona variants.
Exercise 4 ANSWER. Crops and weed
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- The approach 'fertilize once before planting' can be implemented by increasing the initial concentration of P in the upper layer.
- The approach 'fertilize regularly after planting' is implemented as a flux (called Paddition in the scheme).
