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Environmental isotopes in determining groundwater flow systems, northern part of Epirus, Greece

Content Provider	Springer Nature Link
Author	Leontiadis, I. L. Nikolaou, E.
Copyright Year	1999
Abstract	On the basis of the isotopic composition of water in the northern part of Epirus, Greece, from springs at different altitudes with well-defined recharge areas, the altitude effect on the δ$^{18}$O value of groundwater is –0.142±0.003ö (100 m)$^{–1}$ and is uniform over the entire study area.Using the δ$^{18}$O composition of surface water and groundwaters, the contribution of Ioannina Lake and the channel draining the lake water to the Kalamas River to the recharge of springs and boreholes was confirmed and quantitatively defined. In contrast, the Voidomatis and Vikos Rivers are not sources for recharge of the big springs along their banks. However, water from the Aoos River does replenish the aquifer in the unconsolidated deposits underlying the plain of Konitsa. In addition, limestones of Senonian–Late Eocene ages, dolomites, and limestones of the "Vigles" facies are hydraulically interconnected, and the limestones of the "Pantokrator" facies are hydraulically isolated from the other carbonate formations. Les compositions isotopiques d'eau de sources de la partie septentrionale de l'Epire (Grèce), provenant d'altitudes variées et possédant des bassins d'alimentation bien identifiés, ont permis de définir l'effet de l'altitude sur la teneur en oxygène-18 de l'eau souterraine. Cet effet est exprimé par –0.142±0.003ö par 100 m et est uniforme sur l'ensemble du secteur d'étude.A partir des compositions en oxygène-18 des eaux souterraines et de surface, la contribution à la recharge des sources et des puits du lac de Ioannina et du canal drainant l'eau du lac vers la rivière Kalamas a été confirmée et quantitativement définie. Au contraire, les rivières Voidomatis et Vikos ne sont pas une alimentation des importantes sources situées sur leurs rives. Toutefois, l'eau de la rivière Aoos recharge l'aquifère existant dans des dépôts non consolidés de la plaine de Konitsa. De plus, les calcaires du Sénonien à l'Eocène final, les dolomies et les calcaires du faciès Vigles sont hydrauliquement connectés les uns aux autres, alors que les calcaires du faciès Pantokrator sont hydrauliquement isolés des autres formations carbonatées. A partir de los datos de composición isotópica del agua en la zona norte de Epirus, Grecia, procedentes de manantiales situados a diferente altitud y con áreas de recarga bien definidas, se concluye que el efecto de altitud sobre el valor de d$^{18}$O en las aguas subterráneas es de –0.142±0.003ö por cada 100 m de altitud, y que es uniforme sobre toda el área de estudio.Usando los valores de d$^{18}$O de las aguas superficiales y subterráneas fue posible confirmar y cuantificar la contribución a la recarga de los manantiales y sondeos tanto del Lago Ioannina como del canal que drena el lago hacia el Río Kalamas. Por el contrario, se ve que los ríos Voidomatis y Vikos no son fuentes de recarga de los grandes manantiales que se encuentran a lo largo de sus cauces. Por otra parte, se comprueba que el Río Aoos recarga el acuífero en los depósitos no consolidados del llano de Konitsa. Por último, se aprecia que las calcitas del Eoceno Inferior, dolomitas y calcitas de la facies "Vigles" están interconectadas hidráulicamente, mientras que las calcitas de la facies "Pantócrator" están aisladas hidráulicamente de las otras formaciones carbonatadas.
Starting Page	219
Ending Page	226
Page Count	8
File Format	PDF
ISSN	14312174
Journal	Hydrogeology Journal
Volume Number	7
Issue Number	2
e-ISSN	14350157
Language	English
Publisher	Springer-Verlag
Publisher Date	1999-04-15
Publisher Institution	International Association of Hydrogeologists
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Content Type	Text
Resource Type	Article
Subject	Earth and Planetary Sciences Water Science and Technology

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