Groundwater flow systems in the crystalline rocks of the Okanagan Highland, British Columbia

Lawson, Desmond

doi:10.1139/e68-079

Cited by 11 publications

(8 citation statements)

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“…The flow and potential fields in such a system can be calculated according to the methods introduced by Toth (1962; and extended by Freeze and Witherspoon (1966;1967;1968) for numerical integration of Hubbert's (1940) groundwater flow equations subject to a variety of topographic and Figure 5 Plan view of a groundwater flow net during extension of spring heads to form a drainage network. Solid arrows are flow lines, dashes indicate equipotential lines.…”

Section: Channel Initiation By Subsurface Flowmentioning

confidence: 99%

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Formation and controls of channel networks

Dunne

1980

Progress in Physical Geography: Earth and Environment

296

191

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Section: Channel Initiation By Subsurface Flowmentioning

confidence: 99%

“…A range of intermediate depths of groundwater penetration exists between this impermeable extreme and deep aquifers. Lawson (1968, Figure 7) has documented the flow field in one intermediate case.…”

Section: Channel Initiation By Subsurface Flowmentioning

confidence: 99%

Formation and controls of channel networks

Dunne

1980

Progress in Physical Geography: Earth and Environment

296

191

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“…Understanding and predicting the hydraulic properties of fractured crystalline rocks at site scale has high practical relevance and economic importance within the context of, for example, the production of hydrothermal and petrothermal energy, groundwater resources, earthquake science, geological waste disposal, mining, ore body formation, and underground constructions. Although hydraulic tests have been performed all over the world for some decades [e.g., Balla and Molnár , ; Brace , ; Gale , ; Lawson , ; Lomize , ; Manning and Ingebritsen , ; Maréchal et al , ; Masset and Loew , ; Stober and Bucher , ], our capability to predict hydraulic conditions in fractured rocks is still very limited [ Berkowitz , ; Ingebritsen and Manning , ].…”

Section: Introductionmentioning

confidence: 99%

A new global database to improve predictions of permeability distribution in crystalline rocks at site scale

2017

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A comprehensive worldwide permeability data set has been compiled consisting of 29,000 in situ permeabilities from 221 publications and reports and delineating the permeability distribution in crystalline rocks into depths of 2000 meters below ground surface (mbgs). We analyze the influence of technical factors (measurement method, scale effects, preferential sampling, and hydraulic anisotropy) and geological factors (lithology, current stress regime, current seismotectonic activity, and long‐term tectonogeological history) on the permeability distribution with depth, by using regression analysis and k‐means clustering. The influence of preferential sampling and hydraulic anisotropy are negligible. A scale dependency is observed based on calculated rock test volumes equaling 0.6 orders of magnitude of permeability change per order of magnitude of rock volume tested. Based on the entire data set, permeability decreases as log(k) = −1.5 × log(z) − 16.3 with permeability k (m2) and positively increasing depth z (km), and depth is the main factor driving the permeability distribution. The permeability variance is about 2 orders of magnitude at all depths, presumably representing permeability variations around brittle fault zones. Permeability and specific yield/storage exhibit similar depth trends. While in the upper 200 mbgs fracture flow varies between confined and unconfined, we observe confined fracture and matrix flow below about 600 mbgs depth. The most important geological factors are current seismotectonic activity (determined by peak ground acceleration) and long‐term tectonogeological history (determined by geological province). The impact of lithology is less important. Based on the regression coefficients derived for all the geological key factors, permeability ranges of crystalline rocks at site scale can be predicted. First tests with independent data sets are promising.

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“…and the interbeds of conglomerate u and sands provide routes for water flow. The surficial zone of the weathered crystalline basement may even conduct water (Lawson 1968). …”

Section: Geological Settingmentioning

confidence: 99%

Geothermal energy from Penticton Tertiary outlier, British Columbia: an initial assessment

Lewis¹

1984

Can. J. Earth Sci.

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Tertiary basins in south-central British Columbia may be economic sources of hot water for space heating. The heat flow, 72 mW m-' for the Penticton Tertiary outlier, and the insulating layers of volcanic sediments produce particularly high temperatures within this basin. Underneath White Lake, the temperature at the bottom of a spectacular thickness of sediments may be 90°C. The measured porosity, approximately 5%, and the water flows observed in boreholes indicate ample fluid and apparent permeability to extract significant heat from the rocks. However, a more qualitative assessment of these parameters can only come from a thorough hydrogeologic study involving several test wells.The regional heat flow indicates that Coryell-type intrusions having a high radioactive heat generation do not form a significant proportion of the upper crust.Des bassins tertiaires du centre-sud de la Colombie-Britannique offrent un potentiel économique d'eau thermale qui pourrait servir à chauffer des espaces. Le flux thermique, 72 mW m-*, pour le lambeau d'érosion tertiaire de Penticton, et les couches isolantes de sédiments volcaniques développent à l'intérieur de ce bassin des températures particulièrement élevées. Sous le lac White, la température à la base de la grande épaisseur de sédiments peut atteindre 90°C. La porosité mesurée, approximativement 5%, et les débits d'eau observés dans les trous de forage indiquent un grand volume de fluide et une perméabilité apparente suffisante pour récupérer des quantités importantes de chaleur à partir de ces roches. Cependant, une meilleure évaluation qualitative de ces paramètres ne peut être réalisée que par une étude hydrogéologique détaillée qui nécessiterait plusieurs puits d'essais.Le flux thermique régional indique que les intrusions du type Coryell accompagnées d'une grande production de chaleur radioactive n'occupent pas une proportion importante de la croûte supérieure.[Traduit par le journal]Can.

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Groundwater flow systems in the crystalline rocks of the Okanagan Highland, British Columbia

Cited by 11 publications

References 0 publications

Formation and controls of channel networks

Formation and controls of channel networks

A new global database to improve predictions of permeability distribution in crystalline rocks at site scale

Geothermal energy from Penticton Tertiary outlier, British Columbia: an initial assessment

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