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Stochastic modelling of hydraulic conductivity derived from geotechnical data; an example applied to central Glasgow

Published online by Cambridge University Press:  13 November 2018

J. D. O. Williams ,
M. R. Dobbs ,
A. Kingdon ,
R. M. Lark ,
J. P. Williamson ,
A. M. MacDonald  and
B. É. Ó Dochartaigh
J. D. O. Williams*
Affiliation:
British Geological Survey, Environmental Science Centre, Keyworth, Nottingham NG12 5GG, UK. Email: [email protected]
M. R. Dobbs
Affiliation:
British Geological Survey, Environmental Science Centre, Keyworth, Nottingham NG12 5GG, UK. Email: [email protected]
A. Kingdon
Affiliation:
British Geological Survey, Environmental Science Centre, Keyworth, Nottingham NG12 5GG, UK. Email: [email protected]
R. M. Lark
Affiliation:
British Geological Survey, Environmental Science Centre, Keyworth, Nottingham NG12 5GG, UK. Email: [email protected]
J. P. Williamson
Affiliation:
British Geological Survey, Environmental Science Centre, Keyworth, Nottingham NG12 5GG, UK. Email: [email protected]
A. M. MacDonald
Affiliation:
British Geological Survey, The Lyell Centre, Research Avenue South, Edinburgh EH14 4AP, UK.
B. É. Ó Dochartaigh
Affiliation:
British Geological Survey, The Lyell Centre, Research Avenue South, Edinburgh EH14 4AP, UK.
*
*Corresponding author
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Abstract

Characterising the three-dimensional (3D) distribution of hydraulic conductivity and its variability in the shallow subsurface is fundamental to understanding groundwater behaviour and to developing conceptual and numerical groundwater models to manage the subsurface. However, directly measuring in situ hydraulic conductivity can be difficult and expensive and is rarely carried out with sufficient density in urban environments. In this study we model hydraulic conductivity for 603 sites in the unconsolidated Quaternary deposits underlying Glasgow using particle size distribution and density description widely available from geotechnical investigations. Six different models were applied and the MacDonald formula was found to be most applicable in this heterogeneous environment, comparing well with the few available in situ hydraulic conductivity data. The range of the calculated hydraulic conductivity values between the 5th and 95th percentile was 1.56×10–2–4.38mday–1 with a median of 2.26×10–1 mday–1. These modelled hydraulic conductivity data were used to develop a suite of stochastic 3D simulations conditioned to existing 3D representations of lithology. Ten per cent of the input data were excluded from the modelling process for use in a split-sample validation test, which demonstrated the effectiveness of this approach compared with non-spatial or lithologically unconstrained models. Our spatial model reduces the mean squared error between the estimated and observed values at the excluded data locations over those predicted using a simple homogeneous model by 73 %. The resulting 3D hydraulic conductivity model is of a much higher resolution than would have been possible from using only direct measurements, and will improve understanding of groundwater flow in Glasgow and reduce the spatial uncertainty of hydraulic parameters in groundwater process models. The methodology employed could be replicated in other regions where significant volumes of suitable geotechnical and site investigation data are available to predict ground conditions in areas with complex superficial deposits.

Keywords

groundwatergroundwater modelparticle size distributionpermeabilityQuaternary depositssuperficial geology
Type
Articles
Information
Earth and Environmental Science Transactions of The Royal Society of Edinburgh , Volume 108 , Issue 2-3: The Geosciences in Europe’s Urban Sustainability: Lessons from Glasgow and Beyond (CUSP) , June 2017 , pp. 141 - 154
Copyright
Copyright © British Geological Survey UKRI 2018 

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