Articles | Volume 25, issue 7
Hydrol. Earth Syst. Sci., 25, 4041–4059, 2021
Hydrol. Earth Syst. Sci., 25, 4041–4059, 2021

Research article 09 Jul 2021

Research article | 09 Jul 2021

Coupling saturated and unsaturated flow: comparing the iterative and the non-iterative approach

Natascha Brandhorst et al.

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Cited articles

Beegum, S., Šimůnek, J., Szymkiewicz, A., Sudheer, K., and Nambi, I. M.: Updating the Coupling Algorithm between HYDRUS and MODFLOW in the HYDRUS Package for MODFLOW, Vadose Zone J., 17, 180034–180034, 2018. a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p
Brandhorst, N. and Erdal, D.: Coupled saturated and unsaturated flow model, Zenodo,, 2021. a
Constantine, P. G. and Diaz, P.: Global sensitivity metrics from active subspaces, Reliab. Eng. Syst. Safe., 162, 1–13, 2017. a, b
Constantine, P. G., Emory, M., Larsson, J., and Iaccarino, G.: Exploiting active subspaces to quantify uncertainty in the numerical simulation of the HyShot II scramjet, J. Computat. Phys., 302, 1–20, 2015. a
Crosbie, R. S., Binning, P., and Kalma, J. D.: A time series approach to inferring groundwater recharge using the water table fluctuation method, Water Resour. Res., 41, W01008,, 2005. a, b, c
Short summary
We compare two approaches for coupling a 2D groundwater model with multiple 1D models for the unsaturated zone. One is non-iterative and very fast. The other one is iterative and involves a new way of treating the specific yield, which is crucial for obtaining a consistent solution in both model compartments. Tested on different scenarios, this new method turns out to be slower than the non-iterative approach but more accurate and still very efficient compared to fully integrated 3D model runs.