Articles | Volume 23, issue 2
Research article
04 Feb 2019
Research article |  | 04 Feb 2019

Capturing soil-water and groundwater interactions with an iterative feedback coupling scheme: new HYDRUS package for MODFLOW

Jicai Zeng, Jinzhong Yang, Yuanyuan Zha, and Liangsheng Shi

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Cited articles

Bailey, R. T., Morway, E. D., Niswonger, R. G., and Gates, T. K.: Modeling variably saturated multispecies reactive groundwater solute transport with MODFLOW-UZF and RT3D, Groundwater, 51, 752–761,, 2013. 
Celia, M. A., Bouloutas, E. T., and Zarba, R. L.: A general mass-conservative numerical solution for the unsaturated flow equation, Water Resour. Res., 26, 1483–1496,, 1990. 
Crevoisier, D., Chanzy, A., and Voltz, M.: Evaluation of the Ross fast solution of Richards' equation in unfavourable conditions for standard finite element methods, Adv. Water Resour., 32, 936–947,, 2009. 
Dettmann, U. and Bechtold, M.: One-dimensional expression to calculate specific yield for shallow groundwater systems with microrelief, Hydrol. Process., 30, 334–340,, 2016. 
Diersch, H. J. G. and Perrochet, P.: On the primary variable switching technique for simulating unsaturated-saturated flows, Adv. Water Resour., 23, 271–301,, 1999. 
Short summary
Accurately capturing the soil-water–groundwater interaction is vital for all disciplines related to subsurface flow but is difficult when undergoing significant nonlinearity in the modeling system. A new soil-water flow package is developed to solve the switching-form Richards’ equation. A multi-scale water balance analysis joins unsaturated–saturated models at separated scales. The whole system is solved efficiently with an iterative feedback coupling scheme.