Development of a hydrogeological model description of intrusive rock at different investigation scales: an example from south-eastern Sweden

Rhén, Ingvar; Thunehed, Hans; Triumf, Carl-Axel; Follin, Sven; Hartley, Lee; Hermansson, Jan; Wahlgren, Carl‐Henric

doi:10.1007/s10040-006-0124-2

Cited by 13 publications

(3 citation statements)

References 12 publications

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“…7), the fissured layer being ‘verticalized’ parallel to the vein. As a consequence there the fissured layer reaches much greater depths than the classical previously described SFL (up to several hundred metres – see for instance Rhén et al. , 2007).…”

Section: The Fracture Permeability Of Hra Is Due To Weatheringmentioning

confidence: 75%

The fracture permeability of Hard Rock Aquifers is due neither to tectonics, nor to unloading, but to weathering processes

Lachassagne

Wyns

Dewandel³

2011

Terra Nova

210

154

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Terra Nova, 23, 145–161, 2011 Abstract The hydrogeology of superficial (∼0–100 m b.g.l.) Hard Rock Aquifers (HRA; i.e. plutonic and metamorphic rocks) has so far been dominated by a few concepts considered to be relevant by a large majority of the HRA community. One of the most fundamental of these concepts is that their (secondary, fissure/fracture) permeability is either of tectonic origin or related to unloading processes. We will show that these genetic concepts are erroneous. We will demonstrate how the hydraulic conductivity of HRAs is a consequence of the (palaeo) weathering processes, with a stratiform fissured layer located immediately below the unconsolidated saprolite and, to a lesser extent, a verticalized fissured layer at the periphery of (or within) pre‐existing discontinuities (veins, joints, ancient faults, lithological contacts, etc.). This result opens up large perspectives in terms of applied hydrogeology and applied geology. A specifically dedicated methodological toolkit well adapted to the operational survey, management and protection of HRAs is briefly presented.

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Section: The Fracture Permeability Of Hra Is Due To Weatheringmentioning

confidence: 75%

The fracture permeability of Hard Rock Aquifers is due neither to tectonics, nor to unloading, but to weathering processes

Lachassagne

Wyns

Dewandel³

2011

Terra Nova

210

154

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“…3D modelling of the complexity of aquifers may enhance the understanding of the particular hydrogeological context well enough to support the estimation of sustainable yields under various scenarios (Donatis et al , 2005; Spottke et al , 2005). Such modelling involves mapping the configuration and characteristics of the aquifers and groundwater flow systems, which requires data about aquifer geometry (such as thickness, gradient, edge and isolation), geological and stratigraphical configurations (such as fold, syncline, Graben, intersections with the faults and facies changes), and hydraulic properties (such as transmissivity and storavity, and recharge and discharge mechanisms) (Artimo et al , 2003; Jessell, 2001; Kajiyama et al , 2004; Rhén et al , 2007; Robins et al , 2005; Soller et al , 1998). Once assembled, such models support visualization, which is useful for hypothesis generation and to some extent hypothesis testing as well as for stakeholder consensus building (Ross et al , 2007).…”

Section: Introductionmentioning

confidence: 99%

Aquifer visualization for sustainable water management

Nury¹,

Zhu

Cartwright

et al. 2010

Management of Environmental Quality: An International Journal

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Purpose -The purpose of this paper is to develop a three dimensional (3D) geological model, based on geographic information system (GIS), of the Barwon Downs Graben aquifer system in Victoria, Australia, and to visualize the complex geometry as a decision support tool for sustainable water management. Design/methodology/approach -A 3D visualization of the aquifer is completed, based on subsurface geological modelling. The existing borehole database, hydrogeological data, geological information and surface topography are used to model the subsurface aquifer. ArcGIS 9.2 is employed for two-dimensional (2D) GIS analysis and for 3D visualization and modelling geological objects computer aided design (GOCAD) 2.5.2 is used. The developed methodology of ArcGIS and GOCAD is implemented for creating the 3D geological model of the aquifer system. Findings -The 3D geomodel of the Barwon Downs Graben provides a new perspective of the complex subsurface aquifer geometry and its relation with surface hydrogeology in a more interactive manner. Considering the geometry, estimated volume of the unconfined Eastern View aquifer is as 0.83 £ 10 10 m 3 and for the confined aquifer is about 1.02 £ 10 10 m 3 . The total volume of overlying strata of this aquifer is about 3.0 9 £ 10 10 m 3 . The water resources of the study area are affected by the pumping from this aquifer. This is also significantly influenced by the geometry of the Graben. Originality/value -The 3D model utilises comprehensive and generally available datasets in the public domain. Although the used 3D geomodelling tools are mainly developed for applications in the petroleum industry, the current paper shows its ability to be adapted to hydrogeological investigations.

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“…Fortunately, they are usually few and far between, are identifiable by mapping, are treated deterministically (Rhén et al 2007;Hartley et al 2012) and are avoided in the design of repository layouts (Vaitennen et al 2011;Hartley et al 2012). The intervening rock, referred to by Hartley et al (2012) as 'sparsely fractured rock' is here termed 'background crystalline rock' and forms the major geosphere barrier around the canisters of waste.…”

Section: −1mentioning

confidence: 99%

An alternative approach to understanding groundwater flow in sparse channel networks supported by evidence from ‘background’ fractured crystalline rocks

Black¹,

Barker

2018

Hydrogeol J

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Size and shape of individual flow-features, and not their 'organization' in sets of predominant orientation, are the major influences on the ability of groundwater to percolate through sparse channel networks. Measurements in background fractured crystalline rocks proposed for nuclear waste repositories provide useful insight. Flow-features are observed as locations of increased transmissivity during packer or flow testing in boreholes. They are conceived here as channels on fracture surfaces. Findings are based on numerical modelling and a general formula by Barker (2018) for the percolation of two-dimensional (2D) objects in 3D space. Equidimensional shapes are found to be the least efficient at forming percolating networks. As discs are evolved into highly eccentric ellipses, percolation thresholds for number, area and intersection density decrease. At the same time, the percentage of features forming the active flow path declines from about 10% for discs to a few per cent for 50:1 ellipses.

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Development of a hydrogeological model description of intrusive rock at different investigation scales: an example from south-eastern Sweden

Cited by 13 publications

References 12 publications

The fracture permeability of Hard Rock Aquifers is due neither to tectonics, nor to unloading, but to weathering processes

The fracture permeability of Hard Rock Aquifers is due neither to tectonics, nor to unloading, but to weathering processes

Aquifer visualization for sustainable water management

An alternative approach to understanding groundwater flow in sparse channel networks supported by evidence from ‘background’ fractured crystalline rocks

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