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Natural Isotopes and Ion Compositions Identify Changes in Groundwater Flows Affecting Wetland Vegetation in the Drentsche Aa Brook Valley, The Netherlands

Elshehawi Samer, Bregman Enno, Schot Paul, Grootjans Ab

Journal of Ecological Engineering

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2019

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Vol. 20, nr 3

112--125

EN

This study uses groundwater isotopes and ion composition to verify model simulations and ecohydrological studies in the Drentsche Aa nature reserve in The Netherlands, which is representative for the northwestern wetland areas in the Ice Marginal Landscape zone. At eight field sites, a total of 24 samples were analysed for their 13C, 14C, 2H, and 18O isotopes and ionic composition. The isotopes indicate that most of the fen peatlands in the area depend on the exfiltration of sub-regional groundwater flows, which confirmed the previous model simulations and ecohydrological studies. At three sites, isotopes and ionic composition indicate that the groundwater from the sub-regional system has been replaced by local infiltrated rainwater, due to nearby groundwater abstractions for drinking water, which influenced the success rates of the restoration measures. Furthermore, the evidence from chloride and 14C contents was found to indicate the presence of more saline groundwater, which are influenced by the groundwater flows near salt diapirs. Groundwater abstractions may enhance the upward flow of the saline groundwater to eventually exfiltrate at the wetlands, affecting the biodiversity of the nature reserve.

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Ocena możliwości wykorzystania rezerw zasobów dyspozycyjnych wód podziemnych do łagodzenia skutków suszy w rolnictwie

Herbich Piotr

Biuletyn Państwowego Instytutu Geologicznego

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2019

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nr 475, Hydrogeologia z. 16

51--57

PL

Na podstawie danych z bazy GIS Mapy Hydrogeologicznej Polski w skali 1:50 000 ustalono optymalne warunki dla intensywnego poboru wody studniami wierconymi z poziomów wodonośnych podczas długotrwałej suszy hydrologicznej na obszarze pasa nizin środkowopolskich o najniższych w kraju opadach atmosferycznych i głębokich niedoborach wody na terenach upraw rolnych w okresie suszy. Zależnie od warunków hydrogeologicznych i rodzaju gleb, pobór z pojedynczej studni może w okresie głębokiej suszy hydrologicznej pokryć wysokie niedobory wody na terenach upraw rolnych na powierzchni najczęściej 15–50 ha, natomiast czas odbudowy retencji sczerpanych zasobów w ujętym poziomie wodonośnym wyniesie najczęściej 1–5 lat.

EN

Based on the GIS database for the 1: 50,000 Hydrogeological Map of Poland, the optimum conditions have been established for intensive water abstraction by drilled wells from aquifers during a long-lasting hydrological drought in the central regions of the Polish Lowlands. It is the area of country’s lowest precipitation and high water deficits for agriculture during droughts. Depending on the hydrogeological conditions and the type of soils, water abstraction from a single well can cover high water deficit for agriculture during a period of deep hydrological drought in an area of most frequently 15–50 hectares. The time of retention recovery in the aquifer for depleted resources will usually be 1–5 years.

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Groundwater and mass transport modelling for documentation and protection of groundwater resources

Nawalany M., Przybyłek J., Staśko S.

Przegląd Geologiczny

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2010

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Vol. 58, nr 9/1

816-823

EN

Short history of mathematical modeling of groundwater flow and transport in Poland is described. It shows brilliant and long tradition of this advanced aspect of hydrogeology. Mathematical modeling has been extensively used in Poland for years in solving practical problems concerning mainly groundwater abstraction, protection of groundwater resources and, recently, as a routine tool for environmental impact assessment whenever groundwater is involved. Use of numerical models in documenting groundwater resources and conditions of their restoration within regional water balance units are recalled. In particular - documenting admissible volumes of groundwater to be abstracted including wells operating in river valleys, determining protection zones for water supply wells and groundwater reservoirs, in particular for major groundwater basins (in Polish: GZWP), investigating optimal ways of abstracting fresh groundwater in areas where mineral waters occur, investigating alternative groundwater sources for supplying large agglomerations. Three examples: defining changes in groundwater chemical composition in conditions of intensive anthropogenic stress on the environment - impact from urban and industrial waste landfills, agriculture, transportation and municipal facilities on groundwater; coexistence of fresh and mineral waters and, finally, quantitative assessments of impacts from open-pit mines on groundwater in the mining stricken area are described in more detail. Last paragraph of the paper is a future looking assessment of aspects of mathematical modeling in Polish hydrogeology that need to be further developed. The aspects concern scientific issues like: scale problem, inverse problems and chemical reactions in subsoil. Also a need of developing specialized software, setting hardware infrastructure and training staff are addressed as the necessary conditions for keeping pace with world's hydrogeology.