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

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dc.identifier.uri Igel, J. Günther, T. Kuntzer, M. 2016-10-31T13:37:21Z 2016-10-31T13:37:21Z 2013
dc.identifier.citation 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:
dc.description.abstract 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. eng
dc.language.iso eng
dc.publisher Göttingen : Copernicus GmbH
dc.relation.ispartofseries Hydrology and Earth System Sciences 17 (2013), Nr. 2
dc.rights CC BY 3.0 Unported
dc.subject Distributed monitoring eng
dc.subject Geophysical techniques eng
dc.subject Ground Penetrating Radar eng
dc.subject Ground penetrating radars eng
dc.subject Hydraulic simulation eng
dc.subject Hydrological simulations eng
dc.subject Reflection characteristics eng
dc.subject Vertical radar profiling eng
dc.subject Aquifers eng
dc.subject Climate change eng
dc.subject Groundwater resources eng
dc.subject Radar eng
dc.subject Radar measurement eng
dc.subject Sea level eng
dc.subject Silt eng
dc.subject Stratigraphy eng
dc.subject Submarine geology eng
dc.subject Water eng
dc.subject Wells eng
dc.subject Ground penetrating radar systems eng
dc.subject biostratigraphy eng
dc.subject capillarity eng
dc.subject carbon monoxide eng
dc.subject climate change eng
dc.subject coast eng
dc.subject coastal aquifer eng
dc.subject data set eng
dc.subject drinking water eng
dc.subject ground penetrating radar eng
dc.subject hydraulic property eng
dc.subject hydrogeology eng
dc.subject marine sediment eng
dc.subject monitoring eng
dc.subject numerical model eng
dc.subject pressure effect eng
dc.subject pumping eng
dc.subject scattering eng
dc.subject sea level change eng
dc.subject silty loam eng
dc.subject water table eng
dc.subject Borkum eng
dc.subject East Frisian Islands eng
dc.subject Frisian Islands eng
dc.subject Germany eng
dc.subject Lower Saxony eng
dc.subject.ddc 550 | Geowissenschaften ger
dc.subject.ddc 551 | Geologie, Hydrologie, Meteorologie ger
dc.title Ground-penetrating radar insight into a coastal aquifer: The freshwater lens of Borkum Island
dc.type Article
dc.type Text
dc.relation.issn 1027-5606
dc.bibliographicCitation.issue 2
dc.bibliographicCitation.volume 17
dc.bibliographicCitation.firstPage 519
dc.bibliographicCitation.lastPage 531
dc.description.version publishedVersion
tib.accessRights frei zug�nglich

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