NDLI: Factors influencing the hydraulic properties of wells in dolomite aquifers of Slovenia

Content Provider	Springer Nature Link
Author	Verbovšek, Timotej Veselič, Miran
Copyright Year	2007
Abstract	The influence of eight factors on hydraulic parameters (transmissivity, hydraulic conductivity, specific capacity, specific capacity index and maximum yields) are analysed, with data based on hydrogeological reports of 298 wells in dolomite aquifers in Slovenia. Influence of lithological properties is very significant, with the highest values of analysed variables observed in pure late-diagenetic intensely fractured Cordevolian dolomites, followed by Anisian and Late Triassic (‘Main’ dolomite) dolomites with high carbonate content and high primary porosity. The hydraulic parameters are not dependent on aquifer age, partial penetration, and well depth. The effects of depth to the water table and existence of low permeability overburden are not of major importance. The hydraulic parameter values are higher the closer to a river the wells are located, and topographic setting has a major effect. From the well reports, it was not always deduced whether the values of hydraulic conductivity and transmissivity stand for the values of the fractures or of the matrix, so it is proposed that when there is doubt as to whether these values are properly calculated, the most accurate parameters that can be used for a further prediction of aquifer yield are the specific capacity and, to a somewhat lesser extent, the specific capacity index.L’influence de 8 facteurs sur les paramètres hydrauliques (transmissivité, perméabilité, débit spécifique, courbe caractéristique et débit critique) est analysée sur des données issues des rapports de 298 puits dans les aquifères dolomitiques de Slovénie. L’influence des propriétés lithologiques est très significative : les valeurs les plus élevées sont observées dans les dolomies cordevoliennes pures, intensément fracturées et de diagénèse tardive, puis dans les dolomies de l’Anisien et du Trias Supérieur, avec une teneur élevée en carbonates et une forte porosité primaire. Les paramètres hydrauliques ne dépendent pas de l’âge de l’aquifère, de la pénétration partielle ou de la profondeur. Les effets du niveau piézométrique et de l’existence d’une couverture peu perméable sont mineurs. Les paramètres hydrauliques augmentent à proximité des rivières, et la topographie a une influence majeure. Les rapports de forage ne stipulent pas systématiquement si les valeurs de perméabilité et de transmissivité sont relatives au réseau de fractures ou à la matrice ; il a par conséquent été proposé qu’en cas de doute sur le calcul de ces valeurs, les paramètres les plus significatifs pour remonter à la productivité de l’aquifère soient le débit spécifique et, dans une moindre mesure, la courbe caractéristique.Se analiza la influencia de ocho factores sobre parámetros hidráulicos (transmisividad, conductividad hidráulica, capacidad específica, índice de capacidad específica, y rendimientos máximos) en base a datos de reportes hidrogeológicos de 298 pozos en acuíferos de dolomía en Eslovenia. La influencia de las propiedades litológicas es muy significativa con los valores más altos de variables analizadas presentes en dolomías Cordevolianas con diagénesis tardía fracturadas intensamente, seguidas por dolomías (dolomía “Principal”) del Anisiano y Triásico Tardío con alto contenido de carbonato y alta porosidad primaria. Los valores de los parámetros hidráulicos no son dependientes de la edad del acuífero, penetración parcial, y profundidad del pozo. Los efectos de profundidad al nivel freático y existencia de cobertura de baja permeabilidad no son de importancia fundamental. Los valores de los parámetros hidráulicos son más altos mientras más cerca de un río se localizan los pozos y el ámbito topográfico tiene un efecto principal. No se pudo deducir de los reportes de los pozos si los valores de transmisividad y conductividad hidráulica representan valores de las fracturas o de la matriz, de modo que se propone que cuando exista duda en cuanto a que si estos valores se han calculado de manera adecuada, los parámetros de mayor precisión que pueden utilizarse para una predicción futura del rendimiento del acuífero son la capacidad específica y, en menor medida, el índice de capacidad específica.
Starting Page	779
Ending Page	795
Page Count	17
File Format	PDF
ISSN	14312174
Journal	Hydrogeology Journal
Volume Number	16
Issue Number	4
e-ISSN	14350157
Language	English
Publisher	Springer-Verlag
Publisher Date	2007-12-19
Publisher Institution	International Association of Hydrogeologists
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Carbonate rocks Hydraulic testing Slovenia Groundwater statistics Waste Water Technology Water Pollution Control Water Management Aquatic Pollution Geology Hydrogeology
Content Type	Text
Resource Type	Article
Subject	Earth and Planetary Sciences Water Science and Technology

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