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231224s2012 xx |||||o 00| ||eng c |
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|a 10.1111/j.1745-6584.2011.00829.x
|2 doi
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|a eng
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|a Bedekar, Vivek
|e verfasserin
|4 aut
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|a Approaches to the simulation of unconfined flow and perched groundwater flow in MODFLOW
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|c 2012
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|a Text
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|a ƒaComputermedien
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|a ƒa Online-Ressource
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|a Date Completed 21.06.2012
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|a Date Revised 02.03.2012
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|a published: Print-Electronic
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|a Citation Status MEDLINE
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|a © 2011, The Author(s). Ground Water © 2011, National Ground Water Association.
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|a Various approaches have been proposed to manage the nonlinearities associated with the unconfined flow equation and to simulate perched groundwater conditions using the MODFLOW family of codes. The approaches comprise a variety of numerical techniques to prevent dry cells from becoming inactive and to achieve a stable solution focused on formulations of the unconfined, partially-saturated, groundwater flow equation. Keeping dry cells active avoids a discontinuous head solution which in turn improves the effectiveness of parameter estimation software that relies on continuous derivatives. Most approaches implement an upstream weighting of intercell conductance and Newton-Raphson linearization to obtain robust convergence. In this study, several published approaches were implemented in a stepwise manner into MODFLOW for comparative analysis. First, a comparative analysis of the methods is presented using synthetic examples that create convergence issues or difficulty in handling perched conditions with the more common dry-cell simulation capabilities of MODFLOW. Next, a field-scale three-dimensional simulation is presented to examine the stability and performance of the discussed approaches in larger, practical, simulation settings
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|a Journal Article
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|a Niswonger, Richard G
|e verfasserin
|4 aut
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|a Kipp, Kenneth
|e verfasserin
|4 aut
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|a Panday, Sorab
|e verfasserin
|4 aut
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|a Tonkin, Matthew
|e verfasserin
|4 aut
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|i Enthalten in
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|g 50(2012), 2 vom: 15. März, Seite 187-98
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