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Published on: February 25, 2015
Fractional flow in fractured chalk; a flow and tracer test revisited
N E Odling1, L J West, S Hartmann
1School of Earth and Environment, University of Leeds, Woodhouse Lane, Leeds LS1 9JT, UK. n.odling@see.leeds.ac.uk
Abstract:
A multi-borehole pumping and tracer test in fractured chalk is revisited and reinterpreted in the light of fractional flow. Pumping test data analyzed using a fractional flow model gives sub-spherical flow dimensions of 2.2-2.4 which are interpreted as due to the partially penetrating nature of the pumped borehole. The fractional flow model offers greater versatility than classical methods for interpreting pumping tests in fractured aquifers but its use has been hampered because the hydraulic parameters derived are hard to interpret. A method is developed to convert apparent transmissivity and storativity (L(4-n)/T and S(2-n)) to conventional transmissivity and storativity (L2/T and dimensionless) for the case where flow dimension, 2
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