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000874915 1001_ $$0P:(DE-HGF)0$$aBeegum, Sahila$$b0$$eCorresponding author
000874915 245__ $$aInvestigating Atrazine Concentrations in the Zwischenscholle Aquifer Using MODFLOW with the HYDRUS-1D Package and MT3DMS
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000874915 520__ $$aSimulation models that describe the flow and transport processes of pesticides in soil and groundwater are important tools to analyze how surface pesticide applications influence groundwater quality. The aim of this study is to investigate whether the slow decline and the stable spatial pattern of atrazine concentrations after its ban, which were observed in a long-term monitoring study of pesticide concentrations in the Zwischenscholle aquifer (Germany), could be explained by such model simulations. Model simulations were carried out using MODFLOW model coupled with the HYDRUS-1D package and MT3DMS. The results indicate that the spatial variability in the atrazine application rate and the volume of water entering and leaving the aquifer through lateral boundaries produced variations in the spatial distribution of atrazine in the aquifer. The simulated and observed water table levels and the average annual atrazine concentrations were found to be comparable. The long-term analysis of the simulated impact of atrazine applications in the study area shows that atrazine persisted in groundwater even 20 years after its ban at an average atrazine concentration of 0.035 µg/L. These results corroborate the findings of the previous monitoring studies.
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000874915 7001_ $$0P:(DE-Juel1)129548$$aVanderborght, Jan$$b1
000874915 7001_ $$0P:(DE-HGF)0$$aŠimůnek, Jiří$$b2
000874915 7001_ $$0P:(DE-Juel1)129469$$aHerbst, Michael$$b3
000874915 7001_ $$0P:(DE-HGF)0$$aSudheer, K. P.$$b4
000874915 7001_ $$0P:(DE-HGF)0$$aNambi, Indumathi M$$b5
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