NDLI: Competition between topography- and compaction-driven flow in a confined aquifer: Some analytical results

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Hydrogeology of the Mercosul aquifer system in the Paraná and Chaco-Paraná Basins, South America, and comparison with the Navajo-Nugget aquifer system, USA

Hydrogeology Journal : Volume 7, Issue 2, April 1999

Hydrogeology Journal : Volume 7, Issue 1, February 1999

Hydrogeology Journal : Volume 6

Hydrogeology Journal : Volume 5

Competition between topography- and compaction-driven flow in a confined aquifer: Some analytical results

Content Provider	Springer Nature Link
Author	Kooi, Henk
Copyright Year	1999
Abstract	An analysis is presented of the competition between topography- and compaction-driven flow in a confined aquifer. The aquifer crops out and is unconfined in an area with an elevated water table. In the absence of compaction, the elevated water table drives the flow toward areas with a lower water table, and leakage occurs from the aquifer through an overlying aquitard. Under these conditions, recharge occurs in the outcrop area. When sedimentation occurs above the aquifer away from the outcrop area, compaction tends to reverse the flow direction in the aquifer, causing expulsion of groundwater in the outcrop area. The actual flow field arises from the competition between the two driving mechanisms. An analytical expression for the combined flow field is derived in which the contribution from both mechanisms is apparent. The expression is useful as a practical guideline for estimating whether or not compaction can be safely ignored in regional groundwater-flow studies of confined aquifers. La compétition entre l'écoulement imposé par la topographie et celui imposé par la compaction dans un aquifère captif est analysée. L'aquifère est affleurant et est libre avec une surface de la nappe élevée. En l'absence de compaction, la nappe élevée dirige l'écoulement vers des zones où la nappe est basse; il se produit alors une drainance au travers de l'imperméable sus-jacent. Dans ces conditions, la recharge s'effectue dans la zone d'affleurement. Lorsqu'existent des sédiments au-dessus de l'aquifère, en s'éloignant des affleurements, la compaction tend à inverser la direction d'écoulement de l'aquifère, provoquant ainsi une expulsion de l'eau souterraine vers la zone d'affleurement. Le champ réel des écoulements résulte de la compétition entre ces deux mécanismes dirigeant l'écoulement. Une expression analytique du champ d'écoulement combiné, dans laquelle les deux mécanismes interviennent à la fois, est proposée. L'expression est utile en tant qu'indication pratique pour estimer si la compaction peut ou non être ignorée sans risque dans les études d'écoulement régional des eaux souterraines en aquifère captif. Se presenta un análisis sobre dos mecanismos que pueden llegar a rivalizar en gobernar el flujo en un acuífero confinado: topografía y compactación. Cuando el acuífero aflora, se convierte en no confinado en un área con un nivel piezométrico elevado. Si no se produce compactación, estos niveles elevados gobiernan el flujo: el agua fluye hacia zonas de niveles más bajos y se produce goteo desde el acuífero a través de un acuitardo suprayacente. La recarga tiene lugar en la zona aflorante. Cuando se produce sedimentación sobre el acuífero, fuera de la zona de afloramiento, la compactación tiende a invertir el flujo, causando la salida de agua en la zona aflorante. El flujo final es un combinación del producido por ambos mecanismos. Se deriva una expresión analítica para el mecanismo combinado, donde la contribución de cada término se hace aparente. La expresión derivada es útil en estudios concretos de flujo regional en acuíferos confinados para estimar si el efecto de la compactación debe tenerse en cuenta o puede llegar a ignorarse.
Starting Page	245
Ending Page	250
Page Count	6
File Format	PDF
ISSN	14312174
Journal	Hydrogeology Journal
Volume Number	7
Issue Number	3
e-ISSN	14350157
Language	English
Publisher	Springer-Verlag
Publisher Date	2002-10-01
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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