NDLI: Estimating aquifer thickness using multiple pumping tests

Content Provider	Springer Nature Link
Author	Maréchal, Jean Christophe Vouillamoz, Jean Michel Mohan Kumar, M. S. Dewandel, Beit
Copyright Year	2010
Abstract	A method to estimate aquifer thickness and hydraulic conductivity has been developed, consisting of multiple pumping tests. The method requires short-duration pumping cycles on an unconfined aquifer with significant seasonal water-table fluctuations. The interpretation of several pumping tests at a site in India under various initial conditions provides information on the change in hydrodynamic parameters in relation to the initial water-table level. The transmissivity linearly decreases compared with the initial water level, suggesting a homogeneous distribution of hydraulic conductivity with depth. The hydraulic conductivity is estimated from the slope of this linear relationship. The extrapolation of the relationship between transmissivity and water level provides an estimate of the aquifer thickness that is in good agreement with geophysical investigations. The hydraulically active part of the aquifer is located in both the shallow weathered and the underlying densely fractured zones of the crystalline basement. However, no significant relationship is found between the aquifer storage coefficient and initial water level. This new method contributes to filling the methodological gap between single pumping tests and hydraulic tomography, in providing information on the variation of the global transmissivity according to depth. It can be applied to any unconfined aquifer experiencing large seasonal water-table fluctuations and short pumping cycles.On a développé une méthode pour estimer l’épaisseur et la conductivité hydraulique d’un aquifère, consistant en pompages d’essai multiples. La méthode requiert des cycles de pompage de courte durée sur un aquifère libre présentant des fluctuations piézométriques saisonnières significatives. L’interprétation de plusieurs pompages d’essai réalisés sur un site en Inde sous différentes conditions initiales fournit une information sur la variation des paramètres hydrodynamiques en fonction du niveau piézométrique initial. La transmissivité décroît linéairement avec le niveau piézométrique initial, suggérant une distribution homogène de la conductivité hydraulique avec la profondeur. La conductivité hydraulique est déduite de la pente de cette relation linéaire. L’extrapolation de la relation entre transmissivité et niveau piézométrique fournit une estimation de l’épaisseur de l’aquifère en bonne concordance avec les investigations géophysiques. La partie hydrauliquement active de l’aquifère est localisée dans la zone altérée superficielle et dans la partie densément fracturée du socle cristallin. Cependant, aucune relation significative n’est trouvée entre le coefficient d’emmagasinement de l’aquifère et le niveau piézométrique initial. Cette nouvelle méthode contribue à combler la lacune méthodologique existant entre le simple pompage d’essai et la tomographie hydraulique, en fournissant une information sur la variation de la transmissivité globale selon la profondeur. Elle peut être appliquée à n’importe quel aquifère libre présentant d’importantes fluctuations piézométriques saisonnières et des cycles de pompage courts.Se ha desarrollado un método para estimar la conductividad hidráulica y espesor de un acuífero, que consiste en ensayos de bombeo múltiples. El método requiere ciclos de bombeo de corta duración en un acuífero no confinado con significativas oscilaciones estacionales de los niveles freáticos. La interpretación de los ensayos de bombeo múltiples en un sitio en India bajo varias condiciones iniciales provee información sobre el cambio en los parámetros hidrodinámicos en relación al nivel freático inicial. La transmisividad decrece linealmente comparada con el nivel freático inicial, lo que sugiere una distribución homogénea de la conductividad hidráulica con la profundidad. La conductividad hidráulica se estima a partir de la pendiente de esta relación lineal. La extrapolación de la relación entre transmisividad y el nivel del agua provee una estimación del espesor del acuífero que está en un buen acuerdo con las investigaciones geofísicas. La parte activa hidráulicamente del acuífero está localizada tanto en las zonas someras meteorizadas como en las zonas subyacentes densamente fracturadas del basamento cristalino. Sin embargo, no se encontró ninguna relación significativa entre el coeficiente de almacenamiento del acuífero y el valor inicial del nivel de agua. Este nuevo método contribuye a llenar una brecha metodológica entre los ensayos de bombeo simples y la tomografía hidráulica al proveer la información sobre la variación global de la transmisividad global en función de la profundidad. Se puede aplicar a cualquier acuífero no confinado que experimenta grandes fluctuaciones estacionales del nivel freático y cortos ciclos de bombeo本文提出一种根据多个抽水试验估算含水层厚度和水力传导率的方法。此方法要求地下水位有季节波动的非承压含水层有短时间的抽水循环。印度某地区不同初始条件下的几个抽水试验结果为与初始水位有关的水动力参数的变化提供了信息。同初始水位相比, 导水率线性减小, 表明随深度变化, 水力传导率呈均一分布。水力传导率是通过此线性关系的斜率估算的。导水率和地下水位的关系曲线的外延给出了含水层厚度的估算值, 该值与地球物理勘探结果一致。含水层水力梯度较大的地区位于浅部风化区和下伏结晶岩基底的断裂密集带区。但是, 并没有发现含水层储存系数和初始水位之间存在相关性。在提供与深度有关的综合导水率变化的信息方面, 此方法填补了单个抽水试验和水力层析法之间的空白, 可应用于地下水位有大的季节变化和短期的抽水循环的任意非承压含水层。Desenvolveu-se um método baseado em ensaios de bombagem múltiplos para estimar a espessura do aquífero e a sua condutividade hidráulica. O método requer ciclos de bombagem de pequena duração num aquífero livre com flutuações de nível freático sazonais significativas. A interpretação de vários ensaios de bombagem num local da Índia, sob diferentes condições iniciais, dá informação sobre a mudança dos parâmetros hidrodinâmicos em relação ao nível freático inicial. A transmissividade decresce linearmente em comparação com o nível freático inicial, indiciando uma distribuição homogénea da condutividade hidráulica com a profundidade. A condutividade hidráulica estima-se a partir do declive desta relação linear. A extrapolação da relação entre a transmissividade e o nível freático dá uma estimativa da espessura do aquífero, a qual tem uma boa concordância com a investigação geofísica. A parte hidraulicamente activa do aquífero localiza-se quer na parte subsuperficial alterada, quer nas zonas densamente fracturadas do soco cristalino subjacente. Contudo, não se encontrou uma relação significativa entre o coeficiente de armazenamento do aquífero e o nível freático inicial. Este novo método contribui para preencher a lacuna metodológica entre ensaios de bombagem simples e tomografia hidráulica, ao fornecer informação sobre a variação da transmissividade global de acordo com a profundidade. Pode ser aplicado a qualquer aquífero livre que tenha grandes flutuações sazonais do nível freático e ciclos de bombagem curtos.
Starting Page	1787
Ending Page	1796
Page Count	10
File Format	PDF
ISSN	14312174
Journal	Hydrogeology Journal
Volume Number	18
Issue Number	8
e-ISSN	14350157
Language	Portuguese
Publisher	Springer-Verlag
Publisher Date	2010-10-28
Publisher Institution	International Association of Hydrogeologists
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Groundwater hydraulics India Crystalline rocks Fractured rocks Hydraulic testing 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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