Coupling of a surface water- and groundwater flow model to compute bank storage effects in wetlands along the Elbe-Havel Channel on different grid resolutions

Peter Vermeulen1, Heinz Theis2, Bernhard Becker3
1 Subsurface and Groundwater Systems, Deltares
2 Referat Grundwasser, Geologie und Gewässermorphologie, Bundesanstalt für Gewässerkunde
3 Inland Water Systems, Deltares

O 6.5 in Grundwasser-, Boden- und Oberflächenwasser-Interaktionen

30.05.2014, 12:20-12:40, H19, NW II

The effects of climate change upon surface water bodies, and subsequently upon the groundwater regime, will be of increasing importance in connection with the prediction of flow and quality issues. We'll have to expect increased dynamics of climate change and presumably also higher environmental impact consequences. One major related issue  concerns the flooding behaviour of wetlands. For an integrative approach a coupling of different environmental compartments are found to be necessary. In the long-term application, we will need to have a common look at the sediment budget, hydro morphology, and the connectivity of groundwater bodies to surface water. In this paper we describe a first step in this approach; an offline coupling between a regional surface water model and a regional groundwater flow model for the Elbe-Havel Channel area in Germany. In this particular situation it is sufficient to use an offline coupling since the impact of leakage into the groundwater on the water level in the Elbe-Havel Channel is neglectable. In contrast, groundwater levels depend strongly on the water levels in the Elbe-Havel Channel. Incorporating of a high-resolution water levels leads to an improved calibration of the groundwater flow model. It also helps to identify errors in conceptual models, e.g. implications by missing river bank storage effects. The findings are expected to improve maintenance and management of the federal navigable waterways in the Elbe-Havel system. Furthermore, the findings will help to improve the surface water model as well.

We use the capability of iMOD to accurately describe the bank storage effects in the wetlands along the Elbe-Havel Channel on a fine scale. Herefore, iMOD computes the time-dependent surface-subsurface water interaction based on surface water model simulation results with Sobek on the resolution of the groundwater model. iMOD stands for Interactive MODeling and facilitates an easy-to-use modelling environment to engage stakeholders and stimulate participation in active groundwater management. Another difference compared to conventional modelling tools, is the generic geo-referenced data structure that may contain files with unequal resolutions and that can be used to generate sub-models at different scales and resolutions applying up- and downscaling concepts. The modelling environment is therefore capable of simulating different scenarios on different areas of interest and scales, depending on the desired accuracy and/or time constraints.

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Letzte Änderung 01.11.2013