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Machine-learning of nonlocal kernels for anomalous subsurface transport from breakthrough curves

  • *Corresponding author: John T. Foster

    *Corresponding author: John T. Foster

This paper is handled by Andreas Mang as guest editor.

Abstract / Introduction Full Text(HTML) Figure(12) Related Papers Cited by
  • Anomalous behavior is ubiquitous in subsurface solute transport due to the presence of high degrees of heterogeneity at different scales in the media. Although fractional models have been extensively used to describe the anomalous transport in various subsurface applications, their application is hindered by computational challenges. Simpler nonlocal models characterized by integrable kernels and finite interaction length represent a computationally feasible alternative to fractional models; yet, the informed choice of their kernel functions still remains an open problem. We propose a general data-driven framework for the discovery of optimal kernels on the basis of very small and sparse data sets in the context of anomalous subsurface transport. Using spatially sparse breakthrough curves recovered from fine-scale particle-density simulations, we learn the best coarse-scale nonlocal model using a nonlocal operator regression technique. Predictions of the breakthrough curves obtained using the optimal nonlocal model show good agreement with fine-scale simulation results even at locations and time intervals different from the ones used to train the kernel, confirming the excellent generalization properties of the proposed algorithm. A comparison with trained classical models and with black-box deep neural networks confirms the superiority of the predictive capability of the proposed model.

    Mathematics Subject Classification: Primary: 58F15, 58F17; Secondary: 53C35.

    Citation:

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  • Figure 1.  Sketch of a two-dimensional porous medium with periodic heterogeneous conductivity

    Figure 2.  FE mesh of three unit cells

    Figure 3.  Streamlines in the first 3 unit cells

    Figure 4.  Mean square displacement $\left\langle {{{(x - \left\langle x \right\rangle )}^2}} \right\rangle $ of the high-fidelity, particle-tracking solution

    Figure 5.  Coarse-grained density profile $ \bar c_{H\!F} $ at $ t = 72 $

    Figure 6.  The optimal nonlocal spatial kernel

    Figure 7.  BTC predicted by nonlocal model and local models at location 20 (the green dashed line is used to separate training interval and testing interval)

    Figure 8.  $ M\!S\!E $ of predicted BTCs at different locations

    Figure 9.  BTCs predicted by nonlocal dynamic kernel and neural network at location 20 (the green dashed line is used to separate training and testing)

    Figure 10.  $ M\!S\!E $ of predicted BTCs at different location using different size of training data

    Figure 11.  $ M\!S\!E $ of predicted BTCs at different location when $ T_t = 72 $ and $ T_t = 90 $

    Figure 12.  $ M\!S\!E $ of predicted BTCs at different location with different choice of training locations

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