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|a 0-662-14814-2
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|b Inglés (EN)
|a CEDOC-CIRA (Recursos Acuáticos)
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|a 627 R253
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|a Raven, K. G.
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|a Hydraulic characterization of a small ground-water flow system in fractured monzonitic gneiss
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|a Canada | CANADA
|b National hydrology Research Institute /Canada
|c 1986
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|a 131 páginas
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|a Sin Especificar
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|a The hydraulic characteristics of a small groundwater flow system active in a 200-m by 150-m by 50-m deep block of fractured monzonitic gneiss located at Chalk River, Ontario have been determined from surface and bore-hole investigations. Surface investigations including air photo lineament analysis, ground and airborne geophysics and fracture mapping were used to define the local and regional fracture system, locate the study site and direct the exploratory drilling program. Subsurface investigations were completed in 17 boreholes and included fracture logging, systematic straddle-packer injection testing, hydraulic interference testing and long-term hydraulic head monitoring. The interference tests and monitoring were conducted in 90 packer-isolated test intervals created by installation of multiple-packer casings in each borehole. Hydraulic interference tests provided detailed information on the equivalent single-fracture aperture and storativity of four major (= 50-m extent) fracture zones and the vertical hydraulic diffusivity of the rock mass of the study site. Fracture logs and injection test data were combined to generate a tensoral representation of hydraulic conductivity for each test interval. The results of the detailed investigations are presented and interpreted to provide a complete three-dimensional description of the groundwater flow system. A gravity-controlled flow system occurs at the Chalk River study site. Groundwater flow in the rock is primarily vertical to a low-hydraulic head, fracture zone at 33 to 50 m depth with a horizontal component of flow determined by surface topography. An impermeable diabase dyke and three additional high-permeability fracture zones are important hydrogeologic features influencing flow at the study site. The results of the investigations also show that characterization of the geometric and hydraulic properties of large structural discontinuities is essential in understanding the flow of fluids in fractured rocks
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|a Flujo de aguas subterráneas-Sistemas | Hidraúlica
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|c 105363
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