Abstract
Linked simulation-optimization (S/O) approaches have been extensively used as tools in coastal aquifer management. However, parameter uncertainties in seawater intrusion (SI) simulation models often undermine the reliability of the derived solutions. In this study, a stochastic S/O framework is presented and applied to a real-world case of the Longkou coastal aquifer in China. The three conflicting objectives of maximizing the total pumping rate, minimizing the total injection rate, and minimizing the solute mass increase are considered in the optimization model. The uncertain parameters are contained in both the constraints and the objective functions. A multiple realization approach is utilized to address the uncertainty in the model parameters, and a new multiobjective evolutionary algorithm (EN-NSGA2) is proposed to solve the optimization model. EN-NSGA2 overcomes some inherent limitations in the traditional nondominated sorting genetic algorithm-II (NSGA-II) by introducing information entropy theory. The comparison results indicate that EN-NSGA2 can effectively ameliorate the diversity in Pareto-optimal solutions. For the computational challenge in the stochastic S/O process, a surrogate model based on the multigene genetic programming (MGGP) method is developed to substitute for the numerical simulation model. The results show that the MGGP surrogate model can tremendously reduce the computational burden while ensuring an acceptable level of accuracy.
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The authors would like to gratefully acknowledge the financial support from the National Key Research and Development Program of China (No. 2016YFC0402800).
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Zheng Han: model conceptualization, methodology, data curation, programing tune, writing – original draft; Wenxi Lu: supervision, project administration; Yue Fan: writing – review and editing, methodology; Jianan Xu: validation, software; Jin Lin: validation, data curation.
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Han, Z., Lu, W., Fan, Y. et al. Surrogate-Based Stochastic Multiobjective Optimization for Coastal Aquifer Management under Parameter Uncertainty. Water Resour Manage 35, 1479–1497 (2021). https://doi.org/10.1007/s11269-021-02796-5
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DOI: https://doi.org/10.1007/s11269-021-02796-5