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Description:Fire is a pulsing model which includes a switch. When the grass has grown up to a critical mass, the fire switches on. When the grass has burned down, the fire switches off. As the fire burns, it releases nutrients which stimulate growth and are bound up in the grass again. Examples: |
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Variables:G1, G2 = amount of biomass where fire switches on/offTN (total nutrients) = N (nutrients in the soil) + F*Q (nutrients bound in the grass) Q = biomass K... = interaction coefficients Equations:N = TN - F*QR = I/(1 + K*N) DQ = K1*N*R - K2*Q, IF Q>G1 THEN Q=G2 Simulation:The graph shows the changes of N (blue) and Q (green) over a time period. The red lines show the fire.Source code: Fire.java |
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"What if" Experiments:Think about a forest. |