[AHW22-P12] A Multi-Objective Optimization formulation for transient flow restriction in Wellhead Protection
Keywords:Wellhead Protection Area, Transient groundwater analysis, Multiobjective Optimization
The goal of this study is to present a novel pumping-injection management scheme that reduces the influence of transient flow conditions on the actual abstraction zone, so that abstraction remains within the delineated WHPA. Thus, steady-state WHPAs together with old schemes can represent a robust solution against dynamic environments. To formulate our management approach, we use multi-objective optimization (MOO) concepts, searching for compromise solutions that consider at least three objectives: 1) to minimize the risk of pumping water from outside of a given WHPA, 2) to maximize groundwater supply and 3) to minimize involved costs. Additionally, given the high computational cost attributed to dynamic MOO solutions, we explore and analyze a suboptimal alternative where the computed set of non-dominant solutions remain constant for longer time periods. This, provides a more stable well management operation, while skipping many time steps in the optimization.
With the presented framework, we aim to provide to decision makers well operation alternatives that reduce the impact of transiency while considering additional management issues in well catchment protection.