Hydraulic transience and the role of bedding fractures in a bedrock aquitard, southeastern Wisconsin, USA

Eaton, Timothy T.; Bradbury, Kenneth R.

doi:10.1029/2003gl017913

Cited by 20 publications

(34 citation statements)

References 15 publications

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“…However, a uniform stress applied over a wide portion of the system does not necessarily imply that the time series study yields hydraulic parameters linked to the scale of the external constraint, but the results seems to be more representative of the dynamic response of the system, given by composite values between matrix properties, solid compressibility, density and connectivity of fractures and heterogeneities of geology (Bernard and Delay 2008). Indeed, a difference of several orders of magnitude for permeability values obtained from different methods is well-known in aquitard studies (Keller et al 1989, Boldt-Leppin and Hendry 2003, Eaton and Bradbury 2003, Timms and Acworth 2005, Audouin et al 2008) with regard to the scale of characterization. As the study reported here focuses on the local scale, the differences between the estimations are limited.…”

Section: Discussionmentioning

confidence: 99%

“…The values of specific storage are in agreement with others estimated for similar materials and formations. Values of specific storage ranging from 10 -8 to 3 × 10 -6 m -1 for a dolomitic shale aquitard were identified in the Maquoteka Formations (Wisconsin) (Eaton and Bradbury 2003). Clay-rich rocks observed in deep thick formations show equivalent values for storage coefficient, close to 1.1 × 10 -6 m -1 (Delay et al 2007).…”

Section: Pressure Change Analysis and Diffusivity Estimationmentioning

confidence: 99%

“…Assessment of the effective hydraulic properties of these formations remains an essential issue to understanding the dynamic of flow within them. Moreover, the local heterogeneity in such formations remains misunderstood (Keller et al 1989, Peffer 1991, Eaton and Bradbury 2003. In particular, the measurement of hydraulic parameters presents particular challenges (van der Kamp 2001).…”

Section: Introductionmentioning

confidence: 99%

“…Low-conductivity units can imply important controls over groundwater flow (Neuzil 1986). This control should be increased by dynamic processes in multi-layered systems in response to climatic stresses or human exploitation (Eaton and Bradbury 2003).…”

Section: Introductionmentioning

confidence: 99%

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Vertical heterogeneities of hydraulic aquitard parameters: preliminary results from laboratory andin situmonitoring

Larroque

Cabaret

Atteia

et al. 2013

Hydrological Sciences Journal

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A borehole is developed in a shallow multi-layered aquifer and used to derive the porosity, specific storage and hydraulic conductivity of the aquitard. Local values of hydrodynamical parameters are estimated from petrophysical analysis of core samples, and the empirical relationship between porosity and permeability. Vertical diffusivity is determined from the response of the aquitard to a loading cyclic signal using pressure records at different depths. Hydraulic conductivities deduced from the petrophysical analysis ranged from 10 -8 to 10 -10 m s -1and are comparable with those of facies of marine/lacustrine clay observed in samples. The permeability values calculated based on diffusivity are within the range 10 -9 to 10 -11 m s -1 with a quasi-systematic bias of one order of magnitude. These values are average for a larger part of the aquitard and correspond to an integrated value. The methodology retained for the aquitard characterization is discussed with emphasis on the implications for the management of a complex aquifer system. Key words aquitard; pressure propagation; permeability; specific storage; porosity Hétérogénéités verticales des paramètres hydrodynamiques d'un aquitard: résultats préliminaires à partir de mesures en laboratoire et in situRésumé Un puits est implanté dans un aquifère multi-couches peu profond et utilisé pour mesurer les valeurs de porosité, de coefficient d'emmagasinement spécifique et de conductivité hydraulique des formations semiperméables. Les valeurs ponctuelles des paramètres hydrodynamiques sont estimées à partir de mesures pétro-physiques sur les échantillons carottés durant le forage, et grâce à des modèles empiriques porosité-perméabilité. La diffusivité verticale est déterminée à partir de la réponse de l'aquitard aux signaux cycliques de surcharge à partir des enregistrements de pression atmosphérique, à différentes profondeurs. Les valeurs de conductivité hydraulique obtenues à partir des analyses pétrophysiques sont comprises entre 10 -8 et 10 -10 m s -1 et sont cohérentes avec les faciès argileux marins/lacustres observés sur les échantillons. La perméabilité calculée à partir des valeurs de diffusivité se situe dans une gamme comprise entre 10 -9 et 10 -11 m s -1 avec un décalage quasisystématique d'un ordre de grandeur. Ce sont des valeurs moyennes pour un plus grand volume de l'aquitard, correspondant à une valeur intégrée. La méthode retenue ici pour caractériser l'aquitard est discutée, l'accent étant mis sur les implications pour la gestion d'un système aquifère complexe.

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Section: Discussionmentioning

confidence: 99%

Section: Pressure Change Analysis and Diffusivity Estimationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Vertical heterogeneities of hydraulic aquitard parameters: preliminary results from laboratory andin situmonitoring

Larroque

Cabaret

Atteia

et al. 2013

Hydrological Sciences Journal

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“…14). (Fetter, 1980 m/s) (Kleeschulte, 2005;Eaton and Bradbury, 2003), the interburden here has sufficiently low permeability to support the perched mine pool system. Kv = Q/A x (dh/dL) (modified from Fetter, 1980) …”

Section: Hydrologic Characterization Of the Underground Mine Workingsmentioning

confidence: 99%

Hydrologic Characterization of Multiple Seam Underground and Surface Mining in Northern Appalachia

Hawkins¹,

Smoyer²

2012

JASMR

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Abstract.A hydrologic assessment of an underground mine complex overlain by extensive surface mining in north central Pennsylvania has been conducted. The mine complex is drained principally by one discrete discharge point which the flow rate (median of 2,167 L/min.) increased significantly (67%) above background (median of 1,317 L/min.) during the period it took to construct a treatment plant. The source of this major discharge rate increase and other unusual hydrologic characteristics were investigated. Subsequent to background monitoring, about 440 hectares of surface mining and reclamation (85% of the recharge area) occurred on numerous seams overlying the underground mines which greatly increased infiltration rates. A direct correlation was observed between the surface mined area and increased recharge to the underlying deep mines.Atypically, in-mine water storage does not exist to any substantial degree in the basal Lower Kittanning underground mine from which the main discharge emanates. The overlying Middle Kittanning (Shawmut) mine is the main storage unit for mine water. The Middle Kittanning mine behaves like a perched aquifer system because of a moderate vertical hydraulic conductivity (median rate of 1.0 x 10 -7 m/s) of the thin clayrich shale and siltstone interburden (mean of 11.7 m) and local structural features. During periods of low recharge, pool levels decline to a point where the majority of the mine water flowing downward from the Middle Kittanning mine to the underlying Lower Kittanning mine is widespread and diffuse in nature. The discharge rate is consistently within a narrow range of 1,745 to 2,381 L/min. about a median of 2,040 L/min. When surface infiltration rates are high causing the mine pool levels to rise, a portion of the recharge from the Middle Kittanning mine to the lower seam mine is more channelized flowing through the backfill from outcrop surface mining over the buried highwalls and into the underlying Lower Kittanning mine. During these periods, the flow ranges more broadly from 5,725 to over 11,356 L/min. about a median of 8,328 L/min.The openness of the Shawmut mine workings and the water quality of the mine pool make it viable to inject iron sludge. A test injection of 2.8 million liters of iron sludge into the mine was successful. Testing of the mine workings indicates that sufficient space exists to accommodate iron sludge disposal for more than 100 years.

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Complex hydraulic interactions between compartmentalized carbonate aquifers and heterogeneous siliciclastic successions: a case study in southern Italy

et al. 2015

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Abstract:The sedimentary sequences containing lithologic units with low permeability represent hydrogeologic systems which, as of now, have been little studied despite their diffusion worldwide. A hydrogeologic study, aimed to assess the main factors controlling the groundwater flow dynamics in such systems and their hydraulic interactions with nearby carbonate aquifers, has been carried out in Longano (Isernia, Southern Italy).The analysis of the hydraulic heads, combined with the regimes of the springs and the electric conductivity of the groundwater, mainly reflect vertical and lateral heterogeneities of the media in terms of hydraulic properties. In particular, the flow system is controlled by lateral heterogeneities, which characterize a surficial horizon made up of clayey colluviums and talus deposits, separated from the deeper saturated, fissured bedrock. One-to-ten relationships in hydraulic heads, monitored in piezometers crossing the fissured media, further uphold the crucial role played by the lateral contrasts of permeability in controlling the flow dynamics. On the whole, significant interactions with the nearby carbonate hydrostructure take place. Nevertheless, the heterogeneities of the siliciclastic succession and surficial horizon, coupled with the compartmentalization of the carbonate system, leads to a complex hydrogeological scenario.In a wider perspective, this study gives information of utmost importance in order to improve the implementation of mathematical models and configuration of tapping works within these heterogeneous and complex settings.

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Hydraulic transience and the role of bedding fractures in a bedrock aquitard, southeastern Wisconsin, USA

Cited by 20 publications

References 15 publications

Vertical heterogeneities of hydraulic aquitard parameters: preliminary results from laboratory andin situmonitoring

Vertical heterogeneities of hydraulic aquitard parameters: preliminary results from laboratory andin situmonitoring

Hydrologic Characterization of Multiple Seam Underground and Surface Mining in Northern Appalachia

Complex hydraulic interactions between compartmentalized carbonate aquifers and heterogeneous siliciclastic successions: a case study in southern Italy

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