Abstract
We consider the Richards equation on a domain that is decomposed into nonoverlapping layers, i.e., the decomposition has no cross points. We assume that the saturation and permeability functions are space-independent on each subdomain. Kirchhoff transformation of each subdomain problem separately then leads to a set of semilinear equations, which can each be solved efficiently using monotone multigrid. The transformed subdomain problems are coupled by nonlinear continuity and flux conditions. This nonlinear coupled problem can be solved using substructuring methods like the Dirichlet–Neumann or Robin iteration. We give several numerical examples showing the discretization error, the solver robustness under variations of the soil parameters, and a hydrological example with four soil layers and surface water.
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This work was supported by the BMBF–Programm “Mathematik für Innovationen in Industrie und Dienstleistungen”.
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Berninger, H., Kornhuber, R. & Sander, O. A multidomain discretization of the Richards equation in layered soil. Comput Geosci 19, 213–232 (2015). https://doi.org/10.1007/s10596-014-9461-8
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DOI: https://doi.org/10.1007/s10596-014-9461-8
Keywords
- Saturated–unsaturated groundwater flow
- Seepage
- Heterogeneous soil
- Kirchhoff transformation
- Monotone multigrid
- Domain decomposition
- Nonlinear transmission conditions