Optimal feedback synthesis and minimal time function for the bioremediation of water resources with two patches

Abstract : This paper studies the bioremediation, in minimal time, of a water resource or reservoir using a single continuous bioreactor. The bioreactor is connected to two pumps, at different locations in the reservoir, that pump polluted water and inject back sufficiently clean water with the same flow rate. This leads to a minimal-time optimal control problem where the control variables are related to the inflow rates of both pumps. We obtain a non-convex problem for which it is not possible to directly prove the existence of its solutions. We overcome this difficulty and fully solve the studied problem by applying Pontryagin's principle to the associated generalized control problem. We also obtain explicit bounds on its value function via Hamilton-Jacobi-Bellman techniques.
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SIAM Journal on Control and Optimization, Society for Industrial and Applied Mathematics, 2016, 54 (3), pp.1697-1718. 〈http://epubs.siam.org/doi/abs/10.1137/140989443〉. 〈10.1137/140989443〉
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Hector Ramirez Cabrera, Alain Rapaport, Victor Riquelme. Optimal feedback synthesis and minimal time function for the bioremediation of water resources with two patches. SIAM Journal on Control and Optimization, Society for Industrial and Applied Mathematics, 2016, 54 (3), pp.1697-1718. 〈http://epubs.siam.org/doi/abs/10.1137/140989443〉. 〈10.1137/140989443〉. 〈hal-01300953〉

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