NDLI: Hydrogeology of the Upper Aquifer, Dobrich Region, Northeastern Bulgaria

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Hydrogeology of the Upper Aquifer, Dobrich Region, Northeastern Bulgaria

Content Provider	Springer Nature Link
Author	Pulido Bosch, A. Machkova, M. López Chica, M. Calvache, M.L. Dimitrov, D. Calaforra, J.M. Velikov, B. Pentchev, P.
Copyright Year	1997
Abstract	The upper aquifer of the Dobrich region, northeastern Bulgaria, is composed of limestone, calcarenite, sand and probably dolomitic limestone, of Messinian age; total thickness is 40–200 m. Most of the area is underlain by surficial deposits that include slightly permeable loess and highly permeable sand and alluvium. The nearly impervious substratum comprises marl and clay of varying age. In the aquifer as a whole karstic processes are not very pronounced, based on observations of the small variations in the discharges of the springs that have been monitored. The lithology of the Quaternary-age surficial deposits strongly influences the hydrochemistry of groundwater in the aquifer. The main sources of pollution are related to agricultural activities, corralled livestock, and urban wastewater, as indicated by the high nitrate contents of the water in numerous wells. Seawater intrusion is occuring in some eastern parts of the region. L'aquifère supérieur de la Dobrogée (nord-est de la Bulgarie) est constitué par des calcaires, des calcarénites, des sables, et probablement des calcaires dolomitiques d'âge messinien, dont l'épaisseur totale varie de 40 à 200 m. Dans la plus grande partie de la zone il est recouvert par des matériaux détritiques à faible perméabilité (loess) et à perméabilitéélevée (sables et alluvions). Des marnes et des argiles d'âges différents, selon les secteurs, constituent le substratum imperméable. L'ensemble peut être considéré comme un aquifère à fonctionnement karstique très peu accusé, à cause probablement de sa forte porosité, d'après la faible variation des debits des sources contrôlées. La nature de la couverture quaternaire joue un rôle important sur 'hydrogéochimie. Les principales sources de contamination sont liées aux activités agricoles, aux stabulations et aux usées urbaines; la teneur élevée en nitrates des eaux de nombreux puits en témoigne. L'intrusion marine, en tant que processus polluant, semble commencer dans quelques secteurs du bord orienta. El acuífero superior de la región de Dobrich, al noreste de Bulgaria, está constituido por calizas, calcarenitas, arenas y probablemente calizas dolomíticas de edad Messiniense, con un espesor total que varía entre 40 y 200 m. En la mayor parte del área se encuentra recubierto por depósitos de materiales detríticos, desde escasamente permeables (loess), a muy permeables (arenas y aluviones). Es sustrato impermeable está constituido por margas y arcillas de distintas edades. En el conjunto del acuífero, los procesos kársticos son muy poco acusados, según se deduce de la escasa variación de los caudales en las surgencias controladas. Se pone de manifiesto la importancia que desempeña en la hidroquímica la naturaleza del recubrimiento cuaterario, al tiempo que se deduce que los principales focos de contaminación están relacionados con las actividades agrícolas, las estabulaciones ganaderas y las aguas residuales urbanas, tal y como indica el elevado contenido en nitratos de las aguas de numerosos pozos. Fenómenos de intrusión marina parecen haberse iniciado en algunos sectores del borde oriental.
Starting Page	75
Ending Page	85
Page Count	11
File Format	PDF
ISSN	14312174
Journal	Hydrogeology Journal
Volume Number	5
Issue Number	2
e-ISSN	14350157
Language	English
Publisher	Springer-Verlag
Publisher Date	2012-11-20
Publisher Institution	International Association of Hydrogeologists
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Hydrogeology 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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