NDLI: Fractional flow dimensions and hydraulic properties of a fracture-zone aquifer, Leppävirta, Finland

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Fractional flow dimensions and hydraulic properties of a fracture-zone aquifer, Leppävirta, Finland

Content Provider	Springer Nature Link
Author	Leveinen, J. Rönkä, E. Tikkanen, J. Karro, E.
Copyright Year	1998
Abstract	In order to characterize the hydraulic properties of an aquifer in Finland comprising two subvertical fracture zones, observation-well responses were matched with generalized radial flow (GRF) type curves. The responses in six wells out of seven are consistent with the GRF model. The fractional flow dimensions (1–1.2 and 1.5) were determined by regression analysis of straight-line slopes and type-curve matching. In each test, the flow dimensions in the neighboring fracture zone range from 2–2.25. Comparisons of the late-time responses with the asymptotic GRF solution and the flow dimensions obtained by reversing the pumping and observation points suggest homogeneous hydraulic properties. Deviations in responses can be explained by flow-path tortuosity. After assessments of the extent of the flow and radial distances along the fracture system, hydraulic conductivities and storativities were determined from the results of the type-curve matching procedure. The obtained hydraulic conductivities are 1.3×10$^{–5}$ to 7.9×10$^{–5}$ m/s and 5.0×10$^{–6}$ to 2.5×10$^{–5}$ m/s for the western and the eastern fracture zones, respectively. The results were verified by applying them to analytical solutions for pumping wells. The calculated pumping-well responses are consistent with the observations. The analysis of flow dimension also enhances qualitative interpretations on the hydrogeology of fracture zones. Afin d'obtenir les caractéristiques hydrauliques d'un aquifère de Finlande compris entre deux zones de fractures verticales, les réponses de piézomètres ont été confrontées à des courbes types d'écoulement radial généralisé (ERG). Les réponses de six des sept puits sont compatibles avec le modèle ERG. Les dimensions fractionnaires de l'écoulement (1–1,2 et 1,5) ont été déterminées par analyse de régression des pentes des lignes d'écoulement et par comparaison avec les courbes types. Dans chaque essai, les dimensions de l'écoulement obtenues dans la zone de fracture voisine sont comprises entre 2 et 2,25. La comparaison des réponses de retard avec la solution asymptotique de l'ERG et les dimensions de l'écoulement obtenues par inversion du point de pompage et des points d'observation indique des propriétés hydrauliques homogènes. Les écarts par rapport aux réponses peuvent être expliqués par la tortuosité des cheminements.Après estimation de l'extension de l'écoulement et des distances radiales le long du système de fractures, les conductivités hydrauliques et l'emmagasinement ont été déterminés à partir des résultats de la procédure de comparaison avec les courbes types. Les conductivités hydrauliques obtenues sont comprises pour les zones de fractures ouest et est respectivement entre 1,3×10$^{–5}$ et 7,9×10$^{–5}$ m/s et 5,0×10$^{–6}$ et 2,5×10$^{–5}$ m/s. Les résultats ont été vérifiés en les appliquant à des solutions analytiques pour les puits de pompage. Les réponses calculées pour les puits de pompage sont en accord avec les observations. L'analyse de la dimension de l'écoulement met en valeur les interprétations qualitatives sur l'hydrogéologie des zones de fractures. Para caracterizar las propiedades hidráulicas de un acuífero en Finlandia, con dos zonas de fractura subverticales, se utilizó el método de ajuste de las respuestas en pozos de observación con curvas tipo de flujo radial generalizado (FRG). Las respuestas en seis de los siete pozos son consistentes con el modelo FRG. Las dimensiones fraccionales del flujo (1–1.2 y 1.5) se determinaron mediante regresión lineal y ajuste. En cada ensayo, las dimensiones del flujo en la zona de fractura vecina oscilaban entre 2–2.25. Las comparaciones entre las respuestas a largo plazo y la solución asintótica de FRG, así como las dimensiones de flujo estimadas repitiendo los ensayos e invirtiendo los puntos de bombeo y observación, sugieren homogeneidad en las propiedades hidráulicas. Las desviaciones en las respuestas se pueden explicar por tortuosidad en las líneas de flujo.Tras caracterizar la extensión del flujo y las distancias radiales a lo largo del sistema de fracturas, se determinaron conductividades hidráulicas y coeficientes de almacenamiento mediante ajuste de curvas tipo. Las conductividades hidráulicas de las zonas de fractura oscilan entre 1.3×10$^{–5}$–7.9×10$^{–5}$ m/s (zona occidental) y 5.0×10$^{–6}$–2.5×10$^{–5}$ m/s (oriental). Los resultados se verificaron mediante la aplicación de soluciones analíticas. Las respuestas calculadas en el pozo de bombeo son consistentes con las observaciones. El análisis de la dimensión de flujo mejora la interpretación cualitativa de la hidrogeología de zonas fracturadas.
Starting Page	327
Ending Page	340
Page Count	14
File Format	PDF
ISSN	14312174
Journal	Hydrogeology Journal
Volume Number	6
Issue Number	3
e-ISSN	14350157
Language	English
Publisher	Springer-Verlag
Publisher Date	1998-10-21
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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