caa a22 4500 445815590 CHVBK 20180317145227.0 cr unu---uuuuu 170323e20110301xx s 000 0 eng 10.1007/s10040-010-0680-3 doi (NATIONALLICENCE)springer-10.1007/s10040-010-0680-3 Thorn Paul Department of Environmental, Social and Spatial Change, Roskilde University, Hus 02, Universitetsvej 1, 4000, Roskilde, Denmark aut Groundwater salinity in Greve, Denmark: determining the source from historical data [Elektronische Daten] [Paul Thorn] Salinité de la nappe à Greve, Danemark: origine sur la base de données historiques Salinidad del agua subterránea en Greve, Dinamarca: determinación de las fuentes a partir de datos históricos A salinidade da água subterrânea em Greve, Dinamarca: identificação da origem a partir de dados históricos Elevated salinity in groundwater (over 250mg/l chloride) in a fractured chalk aquifer in the municipality of Greve, Denmark, has been attributed to seawater intrusion from the Baltic Sea, resulting in the closure of a number of wells nearest to the coastline. However, a recent study in eastern Denmark shows that the salinity could also be from ancient connate pore waters. Historical chemistry data from bulk-water samples collected from wells have been used to determine the source. The sample data were studied with respect to their historical changes and temporal trends in chloride, carbonate, sulfate, sodium, potassium, magnesium, and calcium. Wells in the southern third of the municipality are relatively low in sodium and carbonate and high in chloride and calcium/magnesium, indicating waters undergoing saline intrusion. Wells in the northern two-thirds of the municipality are high in carbonate and sodium, but low in chloride and calcium/magnesium, indicating a freshening of the aquifer. This is confirmed by the temporal trends in chloride, where chloride levels in the northern wells remain constant, whereas in the south, chloride increases as abstraction continues. Therefore close monitoring for seawater intrusion should be conducted in the southern third of the municipality. Springer-Verlag, 2010 Salt-water/fresh-water relations nationallicence Water supply nationallicence Coastal aquifers nationallicence Denmark nationallicence Hydrogeology Journal Springer-Verlag 19/2(2011-03-01), 445-461 1431-2174 19:2<445 2011 19 10040 https://doi.org/10.1007/s10040-010-0680-3 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10040-010-0680-3 text/html Onlinezugriff via DOI NATIONALLICENCE 100 1- Thorn Paul Department of Environmental, Social and Spatial Change, Roskilde University, Hus 02, Universitetsvej 1, 4000, Roskilde, Denmark aut NATIONALLICENCE 773 0- Hydrogeology Journal Springer-Verlag 19/2(2011-03-01), 445-461 1431-2174 19:2<445 2011 19 10040 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer