Abstract
This study proposes an advanced, efficient numerical solution involving the use of the mixed Lagrangian-Eulerian (LE) method and the finite element method (FEM) for producing 3D simulations of variably saturated subsurface flow as described by Richards’ equation. The LE approach with its particle tracking algorithm was selected for the resolution of numerical problems resulting from the penetration of a sharp front through flux boundaries during the infiltration process. In this new approach, the LE method is applied to interior nodes, and the FEM is applied to incoming-flux-boundary nodes. The proposed numerical scheme is implemented by first obtaining proper matrix equations for the boundary nodes in order to analyze flow behaviors in saturated/unsaturated porous media. In order to demonstrate the performance of the proposed algorithm, four examples are provided; the one-dimensional single- and multi-layered soil column problem, a three-dimensional drainage problem and a three-dimensional pumping well problem. In the four examples, the mixed LE and FEM method (MLE) using relatively large time steps obtained superior results in terms of the accuracy and computational efficiency in comparison with the conventional FEM. The outcome of the proposed study will contribute to efficient numerical solution for subsurface flow problems involving critical boundary conditions in real watershed.
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References
Bensabat, J., Zhou, Q., and Bear, J., 2000, An adaptive pathline-based particle tracking algorithm for the Eulerian-Lagrangian method. Advances in Water Resources, 23, 383–397.
CH2M Hill, 1989, Construction and testing of the aquifer storage recovery (ASR) demonstration project for Lake Okeechobee, Florida. Engineering Report prepared for South Florida Water Management District, SEF24270.BO.61, Volume I, p. 1-1–4-9.
Cheng, H.P., Cheng, J.R., and Yeh, G.T., 1996, A particle tracking technique for the Lagrangian-Eulerian finite element method in multi-dimensions. International Journal for Numerical Methods in Engineering, 39, 1115–1136. https://doi.org/10.1002/(SICI)1097-0207(19960415)39:7<1115::AID-ME895>3.0.CO;2-4
Gardner, W, 1958, Some steady-state solutions of the unsaturated moisture flow equation with application to evaporation from a water table. Soil Science, 85, 228–232.
Huang, K., Zhang, R., and van Genuchten, M.T., 1994, An Eulerian-Lagrangian approach with an adaptively corrected method of characteristics to simulate variably saturated water flow. Water Resources Research, 30, 499–507.
Li, M.H., Cheng, H.P., and Yeh, G.T., 2000, Solving 3D subsurface flow and transport with adaptive multigrid. Journal of Hydrologic Engineering, 5, 74–81.
Lin, H.C., Richards, D.R., Yeh, G.T., Cheng, J.R., Cheng, H.P., and Jones, N.L., 1997, FEMWATER: a three-dimensional finite element computer model for simulating density-dependent flow and transport in variably saturated media. Technical Report, CHL-97-12, U.S. Army Corps of Engineers, Vicksburg, 142 p.
Lu, N., 1994, A semianalytical method of path line computation for transient finite difference groundwater flow models. Water Resources Research, 30, 2449–2459.
Pan, L. and Wierenga, P.J., 1995, A transformed pressure head-based approach to solve Richards’ equation for variably saturated soils. Water Resources Research, 31, 925–931.
Pollock, D.W, 1988, Semianalytical computation of path lines for finite-difference models. Ground Water, 26, 743–750.
Rockhold, M.L., Simmons, C.S., and Fayer, M.J., 1997, An analytical solution technique for one-dimensional, steady vertical water flow in layered soils. Water Resources Research, 33, 897–902.
Schafer-Perini, A.L. and Wilson, J.L., 1991, Efficient and accurate front tracking for two-dimensional groundwater flow models. Water Resources Research, 27, 1471–1485.
Suk, H. and Yeh, G.T., 2009, Multidimensional finite-element particle tracking method for solving complex transient flow problems. Journal of Hydrologic Engineering, 14, 759–766.
Yeh, G.T., Huang, G., Zhang, F., Cheng, H.P., and Lin, H.C., 2005, WASH123D: a numerical model of flow, thermal transport, and salinity, sediment, and water quality transport in WAterSHed systems of 1-D stream-river network, 2-D overland regime, and 3-D subsurface media. Prepared for the Office of Research and Development, U.S. Environmental Protection Agency, 510 p.
Yeh, G.T., Shan, H., and Hu, G., 2004a, An integrated three-dimensional surface water and groundwater model to simulate hydrodynamics and thermal and salinity transport. Developments in Water Science, 55, 1415–1425.
Yeh, G.T., Sharp-Hansen, S., Lester, B., Strobl, R., and Scarbrough, J., 1992, 3DFEMWATER/3DLEWASTE: numerical codes for delineating well head protection areas in agricultural regions based on the assimilative capacity criterion. Technical Report, EPA/600/R-92/223, United States Environmental Protection Agency, Athens, 240 p.
Yeh, G.T., Sun, J., Jardine, P.M., Burgos, W.D., Fang, Y., Li, M.H., and Siegel, M.D., 2004b, HYDROGEOCHEM 5.0: a three-dimensional model of coupled fluid flow, thermal transport, and hydrogeo-chemical transport through variably saturated conditions: Version 5.0. Report, ORNL/TM-2004/107, Oak Ridge National Laboratory, Oak Ridge, 244 p.
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This work was supported by Korea Environment Industry and Technology Institute (KEITI) through Demand Responsive Water Supply Service Program, funded by Korea Ministry of Environment (MOE) (No. 2018002650001).
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Lee, JY., Kim, GB. An advanced mixed Lagrangian-Eulerian and finite element method to simulate 3-D subsurface variably saturated flows. Geosci J 26, 399–413 (2022). https://doi.org/10.1007/s12303-021-0039-x
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DOI: https://doi.org/10.1007/s12303-021-0039-x