NDLI: Fracture hydraulic conductivity in the Mexico City clayey aquitard: Field piezometer rising-head tests

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Short comment and supplement to the paper of J. Bodin, F. Delay and G. de Marsily “Solute transport in a single fracture with negligible matrix permeability. 2. Mathematical formalism” (Hydrogeology Journal 11:434–454)

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Fracture hydraulic conductivity in the Mexico City clayey aquitard: Field piezometer rising-head tests

Content Provider	Springer Nature Link
Author	Vargas, Carlos Ortega Guerrero, Adrián
Copyright Year	2004
Abstract	A regional lacustrine aquitard covers the main aquifer of the metropolitan area of Mexico City. The aquitard’s hydraulic conductivity (K′) is fundamental for evaluating the natural protection of the aquifer against a variety of contaminants present on the surface and its hydraulic response. This study analyzes the distribution and variation of K′ in the plains of Chalco, Texcoco and Mexico City (three of the six former lakes that existed in the Basin of Mexico), on the basis of 225 field-permeability tests, in nests of existing piezometers located at depths of 2–85 m. Tests were interpreted using the Hvorslev method and some by the Bouwer-Rice method. Results indicate that the distribution of K’ fits log-Gaussian regression models. Dominant frequencies for K’ in the Chalco and Texcoco plains range between 1E−09 and 1E−08 m/s, with similar population means of 1.19E−09 and 1.7E−09 m/s, respectively, which are one to two orders of magnitude higher than the matrix conductivity. In the Mexico City Plain the population mean is near by one order of magnitude lower; K’=2.6E−10 m/s. The contrast between the measured K’ and that of the matrix is attributed to the presence of fractures in the upper 25–40 m, which is consistent with the findings of previous studies on solute migration in the aquitard.Un imperméable régional d’origine lacustre recouvre le principal aquifère de la zone urbaine de la ville de Mexico. La conductivité hydraulique K′ de cet imperméable est fondamentale pour évaluer la protection naturelle de l’aquifère, contre les différents contaminants présents en surface, et sa réponse hydraulique. Cette étude analyse et les variations de K′ dans les plaines de Chalco, Texcoco et Mexico (trois des six anciens lacs qui existaient dans le Bassin de Mexico), sur la base de 225 essais de perméabilité sur le terrain, réalisés en grappes dans des piézomètres existants entre 2 et 85 m de profondeur. Les essais ont été interprétés avec la méthode de Hvorslev et certains avec la méthode de Bouwer-Rice. Les résultats indiquent que la distribution de K′ s’ajuste à des modèles de régression log-gaussiens. Les valeurs de K′ les plus fréquentes dans les plaines de Chalco et de Texcoco sont entre 1E−09 et 1E−08 m/s, avec des moyennes similaires de 1.19E−09 et 1.7E−09 m/s respectivement, qui sont d’un ou deux ordres de grandeurs supérieures à la conductivité de la matrice. Dans la plaine de Mexico, la moyenne est proche d’un ordre de grandeur en moins, avec 2.6E−10 m/s. Ce contraste entre le K′ mesuré et celui de la matrice est attribué à la présence de fractures dans les 25–40 m supérieurs, ce qui est en accord avec les études précédentes sur la migration de solutés au travers de l’imperméable.El acuífero principal del Área Metropolitana de la Ciudad de México está recubierto por un acuitardo regional lacustre, cuya conductividad hidráulica es fundamental para evaluar la protección natural de las aguas subterráneas contra los contaminantes presentes en superficie y su respuesta hidráulica. Este estudio analiza la distribución y variación de dicha conductividad en las llanuras de Chalco, Texcoco y Ciudad de México (tres de los seis lagos que existían al principio en la Cuenca de México) a partir de 225 ensayos de campo en piezómetros múltiples existentes, ubicados entre 2 y 85 m de profundidad. La interpretación de los ensayos se ha realizado mediante el método de Hvorslev y—algunos—el de Bouwer-Rice. Los resultados indican que la distribución de la conductividad se ajusta a modelos de regresión lognormales. Las frecuencias dominantes en las Llanuras de Chalco y Texoco están comprendidas entre 1$^{−9}$ y 10$^{−8 }$m/s, con medias de población similares de 1.19×10$^{−9}$ y 1.70×10$^{−9 }$m/s, respectivamente, que son dos órdenes de magnitud mayores que el valor de la matriz. En el Llano de México, la media es casi un orden de magnitud inferior (2.60×10$^{−10 }$m/s). Se atribuye este contraste entre la conductividad hidráulica medida y la de la matriz a la presencia de fracturas en el tramo superior situado entre 25 y 40 m, cosa que es coherente con estudios previos de migración de solutos en el acuitardo.
Starting Page	336
Ending Page	344
Page Count	9
File Format	PDF
ISSN	14312174
Journal	Hydrogeology Journal
Volume Number	12
Issue Number	3
e-ISSN	14350157
Language	English
Publisher	Springer-Verlag
Publisher Date	2004-01-20
Publisher Institution	International Association of Hydrogeologists
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Confining units Contamination Hydraulic properties Mexico City Fractured aquitard
Content Type	Text
Resource Type	Article
Subject	Earth and Planetary Sciences Water Science and Technology

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Theme Issue on Confining Units

Estimating regional-scale fractured bedrock hydraulic conductivity using discrete fracture network (DFN) modeling

Roughness control on hydraulic conductivity in fractured rocks

Evaluation of methods for determination of hydraulic properties in an aquifer–aquitard system hydrologically connected to a river

Constraining the uncertainty in fracture geometry using tracer tests

Normal-stress dependence of fracture hydraulic properties including two-phase flow properties

Investigating cross-contamination of aquifers

Estimating the hydraulic properties of an aquitard from in situ pore pressure measurements

Mapping an aquitard breach using shear-wave seismic reflection

Fracture hydraulic conductivity in the Mexico City clayey aquitard: Field piezometer rising-head tests

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Theme Issue on Confining Units

Estimating regional-scale fractured bedrock hydraulic conductivity using discrete fracture network (DFN) modeling

Roughness control on hydraulic conductivity in fractured rocks

Evaluation of methods for determination of hydraulic properties in an aquifer–aquitard system hydrologically connected to a river

Constraining the uncertainty in fracture geometry using tracer tests

Normal-stress dependence of fracture hydraulic properties including two-phase flow properties

Investigating cross-contamination of aquifers

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Fracture hydraulic conductivity in the Mexico City clayey aquitard: Field piezometer rising-head tests