NDLI: Isotope geochemistry and modelling of the multi-aquifer system in the eastern part of Lithuania

Content Provider	Springer Nature Link
Author	Mokrik, Robert Juodkazis, Vytautas Štuopis, Anicetas Mažeika, Jonas
Copyright Year	2014
Abstract	A steady-state groundwater flow model of three Quaternary intertill aquifers in the eastern part of Lithuania has been compiled. The distinction of separate modelled layers is based on hydraulic and isotope-hydrochemistry data criteria. $^{3}$H data were used to estimate the corrected groundwater age and were coupled with a groundwater-flow-dynamics model of the Quaternary aquifer system along a cross-section flow pathway from the Baltic Upland recharge area in eastern Lithuania towards the discharge area in the lowlands near the city of Kaunas in central Lithuania. The bicarbonate content in groundwater (214–462 mg/l) increases downgradient towards the lowland area. The other major constituents and total dissolved solids (TDS) have a trend analogous to the bicarbonate. The $^{14}$C activity of dissolved inorganic carbon (DIC) in the groundwater ranges from 41.4 to 85.7 pMC. With aquifer-system depth, active precipitation of aqueous solution takes place by dissolving minerals of calcite and dolomite and leakage of “old” groundwater from lower aquifers; the process is also traced by lower $^{14}$C and $^{3}$H activities and by more positive δ$^{18}$O values in lowland areas.Un modèle d’écoulement permanent des trois aquifères interglaciaires du Quaternaire de la partie est de la Lithuanie a été établi. La distinction entre les différentes couches modélisées se base sur des critères de données hydrauliques et d’hydrogéochimie isotopique. Les données $^{3}$H ont été utilisées pour estimer l’âge corrigé des eaux souterraines et couplées avec le modèle hydrodynamique du système aquifère quaternaire, le long d’une coupe du couloir d’écoulement allant de la zone de recharge du Haut Pays Baltique dans l’est de la Lithuanie jusqu’à la zone de décharge des basses terres près de la ville de Kaunas en Lithuanie centrale. La teneur en bicarbonates des eaux (214–462 mg/l) croît vers l’aval jusqu’à la zone des basses terres. Les autres constituants majeurs et les solides dissouts totaux (SDT) montrent une tendance analogue à celle des bicarbonates.L’activité $^{14}$C du carbone inorganique dissous (CID) de l’eau souterraine va de 41.4 à 85.7 pMC (pour cent de carbone moderne). A la profondeur du système aquifère, une précipitation rapide de la solution aqueuse se produit par dissolution de la calcite et de la dolomie et par fuite d’eau souterraine “ancienne” à partir des aquifères inférieurs; le phénomène est tracé également par de plus faibles activités en $^{14}$C et $^{3}$H et par des valeurs plus fortes du δ$^{18}$O dans les zones de basses terres.Se compiló un modelo de flujo de agua subterránea en estado estacionario de tres acuíferos cuaternarios intertill en la parte oriental de Lituania. La distinción entre capas modeladas separadas está basada en criterios y datos hidráulicos e hidroquímicos. Se usaron los datos de $^{3}$H para estimar la edad correcta y se acoplaron con un modelo dinámico de flujo del agua subterránea del sistema acuífero Cuaternario a lo largo de trayectoria de flujo de una sección transversal desde el área de recarga del Alto Báltico en el oriente de Lituania hacia el área de descarga en las tierras bajas cercanas a la ciudad de Kaunas en Lituania Central. El contenido de bicarbonato en el agua subterránea (214–462 mg/l) se incrementa gradiente abajo hacia el área de las tierras bajas. Los otros constituyentes principales y los sólidos totales disueltos (TDS) tienen una tendencia análoga a la bicarbonato. La actividad de $^{14}$C del carbono inorgánico disuelto (DIC) en el agua subterránea va de 41.4 a 85.7 pMC. Con la profundidad de los sistemas de acuíferos, la precipitación activa de soluciones acuosas ocurre por la disolución de minerales de calcita y dolomita y la filtración de agua subterránea vieja desde acuíferos inferiores; el proceso es detectado también por actividades bajas de $^{14}$C y $^{3}$H y por valores más positivos de δ$^{18}$O en las área de tierras bajas.对立陶宛东部三个第四纪冰渍间含水层设计了稳定态地下水流模型。各自模拟的含水层区别基于水力和同位素化学数据标准。利用$^{3}$H数据估算了修正的地下水年龄,并与从立陶宛东部波罗的海高地补给区到立陶宛中部考纳斯城附近的低地排泄区沿剖面的第四系含水层系统地下水流动力学模型相耦合。地下水中重碳酸盐含量(214–462 mg/l)朝低地方向顺梯度降低。其他主要成分及总溶解固体含量(TDS)趋势类似于重碳酸盐。地下水中的溶解无机碳(DIC) 的$^{14}$C活度范围为41.4 到 85.7 pMC。随着含水层系统深度的增加,由于方解石和白云石的溶解及下部含水层“老”地下水的越流,水溶液出现有效沉淀;这个过程也通过下部的$^{14}$C和 $^{3}$H活动以及低地的更真实的δ$^{18}$O的值得到证实。Foi compilado um modelo estacionário de escoamento subterrâneo de três aquíferos quaternários inter-moreia na zona oriental da Lituânia. A diferenciação entre as camadas separadas simuladas é baseada em critérios hidráulicos e hidroquímica isotópica. Foram usados dados de $^{3}$H para estimar a idade corrigida da água subterrânea, e estes foram combinados com um modelo de escoamento subterrâneo do sistema aquífero quaternário, ao longo de uma secção do aquífero desde a área de recarga nas terras altas do Báltico, na Lituânia oriental, até à área de descarga nas terras baixas, próximo da cidade de Kaunas, na Lituânia central. A concentração de bicarbonato na água subterrânea (214–462 mg/l) aumenta ao longo do escoamento subterrâneo, em direção à área de descarga. Os outros elementos maiores e o teor de sólidos dissolvidos totais (TDS) têm uma tendência análoga à do bicarbonato. A atividade de $^{14}$C do carbono inorgânico dissolvido (DIC) na água subterrânea varia entre 41.4 e 85.7 pMC (percentagem de Carbono Moderno). Com o aumento da profundidade do sistema aquífero, a precipitação ativa de solução aquosa ocorre através da dissolução de minerais de calcite e dolomite e através da drenância de água subterrânea “antiga” proveniente dos aquíferos inferiores; este processo é também identificado pelas baixas atividades de $^{14}$C e $^{3}$H e pelos valores de δ$^{18}$O mais positivos nas zonas das terras baixas.Составлена модель стационарной фильтрации подземных вод трех межморенных водоносных горизонтов в восточной части Литвы. Выделениe водоносных горизонтов выполнено на основе анализа изотопно-гидрохимических и гидравлических данных по опробованию скважин. Результаты по тритию использовались для корректировки возраста подземных вод вдоль выбранного профиля от Балтийской возвышенности до низменной части центральной Литвы недалеко от г. Каунас. Отмечено увеличения концентрации гидрокарбонатов (214–462 мг/л) по пути фильтрации к низменной части. Остальные макрокомпоненты и общая минерализация имеют аналогичную тенденцию с гидрокарбонатами. Активность радиоуглерода растворенного неорганического углерода в подземных водах колеблется от 41,4 до 85,7 процентов. В низменной части с увеличением глубины залегания водоносных горизонтов имеет место активное насыщение подземных вод по отношению минералов кальцита и доломита, а также перетекание из нижележащих слоев; отмечается снижение активности радиоуглерода и трития, а также увеличение концентрации δ$^{18}$O.
Starting Page	925
Ending Page	941
Page Count	17
File Format	PDF
ISSN	14312174
Journal	Hydrogeology Journal
Volume Number	22
Issue Number	4
e-ISSN	14350157
Language	Russian
Publisher	Springer Berlin Heidelberg
Publisher Date	2014-04-04
Publisher Institution	International Association of Hydrogeologists
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Radiocarbon Tritium Numerical modelling Groundwater flow Lithuania Hydrogeology Hydrology/Water Resources Geology Waste Water Technology Water Pollution Control Water Management Aquatic Pollution
Content Type	Text
Resource Type	Article
Subject	Earth and Planetary Sciences Water Science and Technology

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