Upscaling and regionalizing hydraulic conductivity and effective porosity at watershed scale in deeply weathered crystalline aquifers

Dewandel, Benoı̂t; Maréchal, Jean-Christophe; Bour, Olivier; Ladouche, Bernard; Ahmed, Shakeel; Chandra, Subash; Pauwels, Hélène

doi:10.1016/j.jhydrol.2011.11.038

Cited by 71 publications

(102 citation statements)

References 62 publications

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“…With respect to the hydro geological properties this uppermost weathered zone is comparable to a coarse-grained porous aquifer with intra-granular flow systems. Dewandel et al (2011) describe hydraulic conductivity and porosity in deeply weathered crystalline aquifers. Weathered zones of the massif are favoured regions for groundwater infil tration and for storage during dry periods.…”

Section: Bohemian Massif (Fractured Aquifer Porous Aquifer)mentioning

confidence: 99%

About faunal life in Austrian aquifers – historical background and current developments

Hilberg¹,

Eisendle-Flöckner²

2016

AJES

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In Austria all general types of aquifers (porous, karstic and fractured) are present and are subject of hydraulic and hydrochemical investigations. However, in hydrogeological research it is a still widely neglected fact that groundwater flow is not only a flux of water, chemicals and heat within lithological units but that groundwater bodies may also act as habitats with very particular conditions for their inhabitants. In general groundwater inhabitants require three things: a place to live, oxygen and energy or food, respectively. Thus, the living conditions of groundwater animals are directly connected to hydrological and geomorphological conditions on a regional scale, and on a local scale, lithological and structural properties that control hydrogeological parameters such as porosity and hydraulic conductivity, recharge mechanisms and flow dynamics.In this paper we view Austrian hydrogeology from the perspective of groundwater fauna in order to elucidate the connection between the hydrogeological conditions and biological patterns. A brief review of groundwater biology research in general and specifically in Austria, revealed that crustaceans are basically in the focus of groundwater research while other common groundwater dwellers, such as free-living nematodes, are less studied similarly. Porous aquifers are comparably well investigated by groundwater biologists, while fractured aquifers have rarely been considered as habitats to date.Due to the complex hydrogeological situation in Austria, with a greater portion of fractured and karstic aquifers, a systematic biological survey considering hydrogeological aspects may lead to a pronounced progress for the both disciplines, hydrogeology and groundwater biology. For hydrogeological purposes, the studies may provide the basis for using groundwater species (similar to the established method of using stable isotopes) as natural tracers in future studies. From the biological perspective, progress in the understanding of complex habitat-biota relations is expected to result from the investigation of hitherto unknown habitats. In addition, such a survey would not only be an important contribution to biodiversity and biogeography in Austria, it would also promote groundwater research in a broader context, such as the need to protect groundwater as a valuable service providing system (e.g. water quality).Preliminary results from six test sites distributed to four different geological settings (Quaternary basin fill, Flysch-Zone, Northern Calcareous Alps and the Central Crystalline Zone within the Alps) show evidence for a link between the hydrogeological conditions and the present biological assemblages. However, a systematic survey is still required to understand which environmental factors mainly govern live in Austrian aquifers.

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Section: Bohemian Massif (Fractured Aquifer Porous Aquifer)mentioning

confidence: 99%

About faunal life in Austrian aquifers – historical background and current developments

Hilberg¹,

Eisendle-Flöckner²

2016

AJES

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“…a productive sedimentary aquifer complexly intruded by low permeability volcanics. This results in variograms showing absence of or weak spatial dependency (Dewandel et al 2012). Several methods were developed to go beyond the traditional two point geostatistical models such as truncated pluri-Guassian, continuous Markov chain and multiple-point statistics (MPS;Guardiano and Srivastava 1993;Strebelle 2002;Renard 2007).…”

Section: Two-point Geostatisticsmentioning

confidence: 99%

Integrating aerial geophysical data in multiple-point statistics simulations to assist groundwater flow models

et al. 2015

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The process of accounting for heterogeneity has made significant advances in statistical research, primarily in the framework of stochastic analysis and the development of multiple-point statistics (MPS). Among MPS techniques, the direct sampling (DS) method is tested to determine its ability to delineate heterogeneity from aerial magnetics data in a regional sandstone aquifer intruded by low-permeability volcanic dykes in Northern Ireland, UK. The use of two two-dimensional bivariate training images aids in creating spatial probability distributions of heterogeneities of hydrogeological interest, despite relatively 'noisy' magnetics data (i.e. including hydrogeologically irrelevant urban noise and regional geologic effects). These distributions are incorporated into a hierarchy system where previously published density function and upscaling methods are applied to derive regional distributions of equivalent hydraulic conductivity tensor K. Several K models, as determined by several stochastic realisations of MPS dyke locations, are computed within groundwater flow models and evaluated by comparing modelled heads with field observations. Results show a significant improvement in model calibration when compared to a simplistic homogeneous and isotropic aquifer model that does not account for the dyke occurrence evidenced by airborne magnetic data. The best model is obtained when normal and reverse polarity dykes are computed separately within MPS simulations and when a probability threshold of 0.7 is applied. The presented stochastic approach also provides improvement when compared to a previously published deterministic anisotropic model based on the unprocessed (i.e. noisy) airborne magnetics. This demonstrates the potential of coupling MPS to airborne geophysical data for regional groundwater modelling.

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“…However, their implementation is limited by problems of cost, time because it requires the execution and equipment of wells (pumping and wells) and the implementation of a long-term pumping. Recently, many authors [11][12][13][14] proposed methodologies for regionalizing specific yield at the watershed scale. These methods combine at cell scale (pumping scale) water-table fluctuation and groundwater-budget techniques in the absence of recharge from rainfall, an aggregation method and variogram based statistics and kriging techniques.…”

Section: Introductionmentioning

confidence: 99%

Groundwater Storage Change Estimation Using Combination of Hydrogeophysical and Groundwater Table Fluctuation Methods in Hard Rock Aquifers

Koïta

Yonli²,

Soro

et al. 2018

Resources

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Abstract:This study aims to estimate the groundwater storage change of hard rock aquifers in the face of change. For this, the approach developed consisted initially in the implementation of 5 Magnetic Resonance Soundings (MRS) around the observation wells realized and monitored from 2014 to 2015 in the Sanon experimental site. In a second step, we determined the storage change using the MRS data and the water table fluctuation method. The MRS data show that the water content varies spatially from 4.5 to 1.3%. The maximum value is recorded at the central valley where a piezometric dome is observed. The specific yield varies from 2.4% in the central valley to 1.3% at the outlet. The renewed water resource is estimated at 116 mm in the central valley and 32 mm at the outlet, which corresponds respectively to 13 and 3% of the annual rainfall. The renewed water resource is consistent with the annual recharge. Thus, the combination of the MRS geophysical approach and water table fluctuation method is an efficient, fast and cheaper (compared with long-term pumping test) tool for the estimation of groundwater storage changes.

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Upscaling and regionalizing hydraulic conductivity and effective porosity at watershed scale in deeply weathered crystalline aquifers

Cited by 71 publications

References 62 publications

About faunal life in Austrian aquifers – historical background and current developments

About faunal life in Austrian aquifers – historical background and current developments

Integrating aerial geophysical data in multiple-point statistics simulations to assist groundwater flow models

Groundwater Storage Change Estimation Using Combination of Hydrogeophysical and Groundwater Table Fluctuation Methods in Hard Rock Aquifers

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