Ground-penetrating radar insight into a coastal aquifer: The freshwater lens of Borkum Island

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Igel, J.; Günther, T.; Kuntzer, M.: Ground-penetrating radar insight into a coastal aquifer: The freshwater lens of Borkum Island. In: Hydrology and Earth System Sciences 17 (2013), Nr. 2, S. 519-531. DOI:

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Freshwater lenses, as important resource for drinking water, are sensitive to climate changes and sea level rise. To simulate this impact on the groundwater systems, hydraulic subsurface models have to be designed. Geophysical techniques can provide information for generating realistic models. The aim of our work is to show how groundpenetrating radar (GPR) investigations can contribute to such hydrological simulations. In the pilot area, Borkum island, GPR was used to map the shape of the groundwater table (GWT) and to characterise the aquifer. In total, 20 km of constant offset (CO) profiles were measured with centre frequencies of 80 and 200 MHz. Wave velocities were determined by common midpoint (CMP) measurements and vertical radar profiling (VRP) in a monitoring well. The 80MHz CO data show a clear reflection at the groundwater table, whereas the reflection is weaker for the 200MHz data. After correcting the GPR water tables for the capillary rise, they are in good accordance with the pressure heads of the observation wells in the area. In the centre of the island, the groundwater table is found up to 3.5m above sea level, however it is lower towards the coastline and marshland. Some local depressions are observed in the region of dune valleys and around pumping stations of the local water supplier. GPR also reveals details within the sediments and highly-permeable aeolian sands can be distinguished from less-permeable marine sediments. Further, a silt loam layer below the water table could be mapped on a large area. The reflection characteristics indicates scattered erosion channels in this layer that cause it to be an aquitard with some leakage. GPR provides a high resolution map of the groundwater table and insight into the stratigraphy of the sediments and their hydraulic properties. This is valuable complementary information to the observation of sparsely distributed monitoring wells as input to hydraulic simulation.
License of this version: CC BY 3.0 Unported
Document Type: Article
Publishing status: publishedVersion
Issue Date: 2013
Appears in Collections:Naturwissenschaftliche Fakultät

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1 image of flag of Germany Germany 288 65.16%
2 image of flag of United States United States 51 11.54%
3 image of flag of China China 15 3.39%
4 image of flag of France France 8 1.81%
5 image of flag of No geo information available No geo information available 7 1.58%
6 image of flag of Japan Japan 7 1.58%
7 image of flag of New Zealand New Zealand 5 1.13%
8 image of flag of Switzerland Switzerland 5 1.13%
9 image of flag of Russian Federation Russian Federation 4 0.90%
10 image of flag of Australia Australia 4 0.90%
    other countries 48 10.86%

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