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| Titel |
Numerical modelling of climate change impacts on freshwater lenses on the North Sea Island of Borkum using hydrological and geophysical methods |
| VerfasserIn |
H. Sulzbacher, H. Wiederhold, B. Siemon, M. Grinat, J. Igel, T. Burschil, T. Günther, K. Hinsby |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1027-5606
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| Digitales Dokument |
URL |
| Erschienen |
In: Hydrology and Earth System Sciences ; 16, no. 10 ; Nr. 16, no. 10 (2012-10-16), S.3621-3643 |
| Datensatznummer |
250013517
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| Publikation (Nr.) |
 copernicus.org/hess-16-3621-2012.pdf |
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| Zusammenfassung |
A numerical, density dependent groundwater model is set up for the North Sea
Island of Borkum to estimate climate change impacts on coastal aquifers and
especially the situation of barrier islands in the Wadden Sea. The database
includes information from boreholes, a seismic survey, a helicopter-borne
electromagnetic (HEM) survey, monitoring of the freshwater-saltwater
boundary by vertical electrode chains in two boreholes, measurements of
groundwater table, pumping and slug tests, as well as water samples. Based
on a statistical analysis of borehole columns, seismic sections and HEM, a
hydrogeological model is set up. The groundwater model is developed using
the finite-element programme FEFLOW. The density dependent groundwater model
is calibrated on the basis of hydraulic, hydrological and geophysical data,
in particular spatial HEM and local monitoring data. Verification runs with
the calibrated model show good agreement between measured and computed
hydraulic heads. A good agreement is also obtained between measured and
computed density or total dissolved solids data for both the entire
freshwater lens on a large scale and in the area of the well fields on a
small scale.
For simulating future changes in this coastal groundwater system until the
end of the current century, we use the climate scenario A2, specified by the
Intergovernmental Panel on Climate Change and, in particular, the data for the
German North Sea coast. Simulation runs show proceeding salinisation with
time beneath the well fields of the two waterworks Waterdelle and Ostland.
The modelling study shows that the spreading of well fields is an appropriate
protection measure against excessive salinisation of the water supply until
the end of the current century. |
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