Hydraulic testing and modelling of a low-angle fracture zone at Finnsjön, Sweden

Andersson, Johan; Ekman, L.; Nordqvist, Rune; Winberg, Anders

doi:10.1016/0022-1694(91)90200-2

Cited by 27 publications

(12 citation statements)

References 6 publications

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“…Significant groundwater discharge from carbonate aquifers is also expected where damage zones enhance fault zone permeability within siliciclastic and marlyclayey-calcareous successions (Chester and Logan, 1986;Andersson et al, 1991;Goddard and Evans, 1995), but no experimental data have been acquired up to now to support such a hypothesis in the study area. With regard to the hydrogeologic behaviour of tectonic discontinuities, the present study showed that reverse faults within marly-clayey-calcareous successions may partially impede groundwater flow, probably due to a better developed fault core.…”

Section: Discussionmentioning

confidence: 96%

Heterogeneous aquitard properties in sedimentary successions in the Apennine chain: case studies in southern Italy

Petrella

Celico

2009

Hydrological Processes

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Abstract:The aim of this study was to analyse the hydrogeologic role of siliciclastic deposits and marly-clayey-calcareous successions within the carbonate Apennine chain (southern Italy). The study was carried out along the northern part of the Matese carbonate massif through (1) the hydraulic characterization of siliciclastic rocks in a test site, by means of Lugeon tests, and (2) the identification of the groundwater flow system discharging at an important spring located within a marly-clayey-calcareous succession in a second test site, by means of isotopic investigations.The results showed that the investigated siliciclastic deposits and marly-clayey-calcareous successions may allow significant groundwater discharge from carbonate aquifers. Thus, they do not everywhere behave as aquitard, contrary to the previous model. Instead, groundwater flows through the upper part of these successions, where stress release fracturing enhanced rock permeability in the near-surface bedrock. Thus, these successions may locally be a new groundwater source within the southern Apennine chain.

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Section: Discussionmentioning

confidence: 96%

Heterogeneous aquitard properties in sedimentary successions in the Apennine chain: case studies in southern Italy

Petrella

Celico

2009

Hydrological Processes

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“…The damage zone includes fault- related subsidiary structures and can enhance fault zone permeability relative to the core and the undeformed protolith (e.g. Chester & Logan, 1986;Andersson et al, 1991;Goddard & Evans, 1995). Thus, mixing of water is expected to occur within these zones, due to coexistence of thinner and thicker openings in a complex architecture (box C in Fig.…”

Section: International Journal Ofmentioning

confidence: 99%

Mixing of water in a carbonate aquifer, southern Italy, analysed through stable isotope investigations

Petrella¹,

Celico²

2013

IJS

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“…Many studies have shown the decreased fault‐normal flow across fault zones, mainly caused by the low permeable central fault gouge and also by the preferred fault‐parallel orientation of fracturation within the adjacent damage zone (Smith et al ., ; Caine et al ., ; Lopez and Smith, ). This anisotropy ratio has been shown to range between ≤10 (Andersson et al ., ; Forster and Evans, ) up to several orders of magnitude (Smith et al ., ; Evans et al ., ). As the fault zone in our case includes only very few gouge material, which would potentially inhibit fault‐normal flow, an anisotropy ratio within the fault zone of 1:10 was initially assumed.…”

Section: Hydrogeological Parametersmentioning

confidence: 99%

“…GROUNDWATER FLOW SYSTEMS IN THE ROTONDO GRANITE, CENTRAL ALPS (CH) orientation of fracturation within the adjacent damage zone (Smith et al, 1990b;Caine et al, 1996;Lopez and Smith, 1996). This anisotropy ratio has been shown to range between ≤10 (Andersson et al, 1991;Forster and Evans, 1991) up to several orders of magnitude (Smith et al, 1990b;Evans et al, 1997). As the fault zone in our case includes only very few gouge material, which would potentially inhibit fault-normal flow, an anisotropy ratio within the fault zone of 1:10 was initially assumed.…”

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confidence: 99%

Hydraulic subsurface measurements and hydrodynamic modelling as indicators for groundwater flow systems in the Rotondo granite, Central Alps (Switzerland)

2012

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Abstract:Regional groundwater flow in high mountainous terrain is governed by a multitude of factors such as geology, topography, recharge conditions, structural elements such as fracturation and regional fault zones as well as man-made underground structures. By means of a numerical groundwater flow model, we consider the impact of deep underground tunnels and of an idealized major fault zone on the groundwater flow systems within the fractured Rotondo granite. The position of the free groundwater table as response to the above subsurface structures and, in particular, with regard to the influence of spatial distributed groundwater recharge rates is addressed. The model results show significant unsaturated zones below the mountain ridges in the study area with a thickness of up to several hundred metres. The subsurface galleries are shown to have a strong effect on the head distribution in the model domain, causing locally a reversal of natural head gradients. With respect to the position of the catchment areas to the tunnel and the corresponding type of recharge source for the tunnel inflows (i.e. glaciers or recent precipitation), as well as water table elevation, the influence of spatial distributed recharge rates is compared to uniform recharge rates. Water table elevations below the well exposed high-relief mountain ridges are observed to be more sensitive to changes in groundwater recharge rates and permeability than below ridges with less topographic relief. In the conceptual framework of the numerical simulations, the model fault zone has less influence on the groundwater table position, but more importantly acts as fast flow path for recharge from glaciated areas towards the subsurface galleries. This is in agreement with a previous study, where the imprint of glacial recharge was observed in the environmental isotope composition of groundwater sampled in the subsurface galleries.

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Hydraulic testing and modelling of a low-angle fracture zone at Finnsjön, Sweden

Cited by 27 publications

References 6 publications

Heterogeneous aquitard properties in sedimentary successions in the Apennine chain: case studies in southern Italy

Heterogeneous aquitard properties in sedimentary successions in the Apennine chain: case studies in southern Italy

Mixing of water in a carbonate aquifer, southern Italy, analysed through stable isotope investigations

Hydraulic subsurface measurements and hydrodynamic modelling as indicators for groundwater flow systems in the Rotondo granite, Central Alps (Switzerland)

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