This technique improves modeling accuracy of groundwater and surface water interactions in karst aquifers, suggesting efficiency over traditional methods.
A high-order combined interpolation/finite element technique is developed for solving the coupled groundwater-surface water system that governs flows in karst aquifers. In the proposed high-order scheme we approximate the time derivative with piecewise polynomial interpolation of second-order and use the finite element discretization of piecewise polynomials of degree d and $d+1$, where d ≥ 2 is an integer, to approximate the space derivatives. The stability together with the error estimates of the constructed technique are established in L∞(0,T;\,L²)-norm. The analysis suggests that the developed computational technique is unconditionally stable, temporal second-order accurate and convergence in space of order $d+1$. Furthermore, the new approach is faster and more efficient than a broad range of numerical methods discussed in the literature for the given initial-boundary value problem. Some examples are carried out to confirm the theoretical results.
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Ngondiep et al. (2025) studied this question.
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