Articles | Volume 25, issue 7
Hydrol. Earth Syst. Sci., 25, 4041–4059, 2021
https://doi.org/10.5194/hess-25-4041-2021
Hydrol. Earth Syst. Sci., 25, 4041–4059, 2021
https://doi.org/10.5194/hess-25-4041-2021

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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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.