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Book Chapter

Numerical groundwater modelling in karst

By
Neven Kresic
Neven Kresic
1
Amec Foster Wheeler, 1075 Big Shanty Road NW, Suite 100 Kennesaw, GA 30144, USA
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Sorab Panday
Sorab Panday
2
GSI Environmental inc., 626 Grant Street, Suite C, Herndon, VA 20170, USA
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Published:
January 01, 2018

Abstract

The success of translating a conceptual site model for a karst site into a numerical groundwater model will depend on both the experience of the user and the capabilities and limitations of the selected computer program. Despite its numerous advantages, even MODFLOW – probably the most widely used, tested and verified modelling program currently available – has conceptual limitations that many karst hydrogeologists have to deal with on a routine basis while searching for an equivalent porous medium approach that may work. This includes assigning very high values of hydraulic conductivity to those model cells known, or suspected, to contain highly transmissive conduits, or assigning an unreasonable, very low effective porosity to the model cells with virtual ‘conduits’ to simulate high groundwater velocities. A new version of MODFLOW called MODFLOW-USG (UnStructured Grid) has been developed and released to the public domain. This new version retains full compatibility with previous versions of MODFLOW while taking advantage of unstructured grids and finite volume numerical solutions. It enables hydrogeologists to accurately translate even the most complex conceptual site models in karst into a numerical environment, thus eliminating the need for various surrogate modelling solutions based on an equivalent porous medium approach.

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Contents

Geological Society, London, Special Publications

Advances in Karst Research: Theory, Fieldwork and Applications

M. Parise
M. Parise
University Aldo Moro, Italy
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F. Gabrovsek
F. Gabrovsek
Karst Research Institute ZRC SAZU, Slovenia
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G. Kaufmann
G. Kaufmann
Freie Universität Berlin, Germany
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N. Ravbar
N. Ravbar
Karst Research Institute ZRC SAZU, Slovenia
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Geological Society of London
Volume
466
ISBN electronic:
9781786203786
Publication date:
January 01, 2018

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