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Published in: Hydrogeology Journal 6/2012

01-09-2012 | Paper

Estimating regional-scale fractured bedrock hydraulic conductivity using discrete fracture network (DFN) modeling

Authors: H. Voeckler, D. M. Allen

Published in: Hydrogeology Journal | Issue 6/2012

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Abstract

Estimating bedrock hydraulic conductivity of regional fractured aquifers is challenging due to a lack of aquifer testing data and the presence of small and large-scale heterogeneity. This study provides a novel approach for estimating the bedrock hydraulic conductivity of a regional-scale fractured bedrock aquifer using discrete fracture network (DFN) modeling. The methodology is tested in the mountainous Okanagan Basin, British Columbia, Canada. Discrete fractures were mapped in outcrops, and larger-scale fracture zones (corresponding to lineaments) were mapped from orthophotos and LANDSAT imagery. Outcrop fracture data were used to generate DFN models for estimating hydraulic conductivity for the fractured matrix (K m). The mountain block hydraulic conductivity (K mb) was estimated using larger-scale DFN models. Lineament properties were estimated by best fit parameters for a simulated pumping test influenced by a fracture zone. Unknown dip angles and directions for lineaments were estimated from the small-scale fracture sets. Simulated K m and K mb values range from 10–8 to 10–7 m/s and are greatest in a N–S direction, coinciding with the main strike direction of Okanagan Valley Fault Zone. K mb values also decrease away from the fault, consistent with the decrease in lineament density. Simulated hydraulic conductivity values compare well with those estimated from pumping tests.

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Metadata
Title
Estimating regional-scale fractured bedrock hydraulic conductivity using discrete fracture network (DFN) modeling
Authors
H. Voeckler
D. M. Allen
Publication date
01-09-2012
Publisher
Springer-Verlag
Published in
Hydrogeology Journal / Issue 6/2012
Print ISSN: 1431-2174
Electronic ISSN: 1435-0157
DOI
https://doi.org/10.1007/s10040-012-0858-y

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