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Controlling self-organized criticality in sandpile models
R.F. Andrade - UFBA
We introduce an external control to reduce the size of avalanches
in some sandpile models exhibiting self organized criticality.
This rather intuitive approach seems to be missing in the vast
literature on such systems. The control action, which amounts to
triggering avalanches in sites that are near to be come critical,
reduces the probability of very large events, so that energy
dissipation occurs most locally. The control is applied to a
directed Abelian sandpile model driven by both uncorrelated and
correlated deposition. The latter is essential to design an
efficient and simple control heuristic, but has only small
influence in the uncontrolled avalanche probability distribution.
The proposed control seeks a tradeoff between control cost and
large event risk.
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