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Update Physical Processes authored by Wijsman, Jeroen's avatar Wijsman, Jeroen
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NPZ-model/Physical-Processes.md
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# Transport
State variables in the water column (DIN, Phyto, Zoo and Det) are transported by tidal currents. This transport is modeled as exchange rates between the neighboring compartments. It is assumed that the exchange rates are bi-directional, i.e. the exchange rate [m<sup>3</sup> d<sup>-1</sup>] from compartment $`i`$ to compartment $`j`$ is the same as the exchange rate from compartment $`j`$ to $`i`$.
State variables in the water column (DIN, Phyto, Zoo and Det) are transported by tidal currents. This transport is modeled as exchange rates between the neighboring compartments. It is assumed that the exchange rates are bi-directional, i.e. the exchange rate [m<sup>3</sup> d<sup>-1</sup>] from compartment $`i`$ to compartment $`j`$ is the same as the exchange rate from compartment $`j`$ to $`i`$. As a result there is no net transport of water between neighboring compartments. However, if there is a difference in concentration of state variable $`C`$, there will be a net transport of that state varialbe.
```math
Flux_{i,j} = \frac{Ex_{i,j}\cdot(C_{j}-C_{i})}{Vol_{i}}
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