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Artificial Neural Network and Grey Wolf Optimizer Based Surrogate Simulation-Optimization Model for Groundwater Remediation

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Abstract

We herein propose a simulation-optimization model for groundwater remediation, using PAT (pump and treat), by coupling artificial neural network (ANN) with the grey wolf optimizer (GWO). The input and output datasets to train and validate the ANN model are generated by repetitively simulating the groundwater flow and solute transport processes using the analytic element method (AEM) and random walk particle tracking (RWPT). The input dataset is the different realization of the pumping strategy and output dataset are hydraulic head and contaminant concentration at predefined locations. The ANN model is used to approximate the flow and transport processes of two unconfined aquifer case studies. The performance evaluation of the ANN model showed that the value of mean squared error (MSE) is close to zero and the value of the correlation coefficient (R) is close to 0.99. These results certainly depict high accuracy of the ANN model in approximating the AEM-RWPT model. Further, the ANN model is coupled with the GWO and it is used for remediation design using PAT. A comparison of the results of the ANN-GWO model with solutions of ANN-PSO (ANN-Particle Swarm Optimization) and ANN-DE (ANN-Differential Evolution) models illustrates the better stability and convergence behaviour of the proposed methodology for groundwater remediation.

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Correspondence to T.I. Eldho.

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Highlights

• Analytic element method and random walk particle tracking are used for groundwater remediation through an ANN-based approximate model.

• The first-ever use of the Grey wolf optimizer (GWO) for groundwater remediation.

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Majumder, P., Eldho, T. Artificial Neural Network and Grey Wolf Optimizer Based Surrogate Simulation-Optimization Model for Groundwater Remediation. Water Resour Manage (2020). https://doi.org/10.1007/s11269-019-02472-9

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Keywords

  • Groundwater remediation
  • Analytic element method (AEM)
  • Random walk particle tracking (RWPT)
  • Artificial neural network (ANN)
  • Grey wolf optimizer GWO)
  • Kernel density estimator (KDE)