Numerical simulation experiments on water seepage patterns in heterogeneous, unsaturated rock fractures

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Water seepage has been numerically simulated in heterogeneous fractures, which were conceptualized as two-dimensional heterogeneous porous media. Flow was found to proceed in dendritic patterns along preferential paths, giving rise to such features as localized ponding and bypassing. Limited parameter variation studies have shown strong dependence of seepage patterns on fracture permeability and applied flow rate. The temporal evolution of seeps proceeds on a vast range of time scales. This casts doubt on the applicability of steady-state concepts for water migration in thick unsaturated zones of fractured rock where infiltration is episodic. An approximate invariance of seepage behavior was derived ... continued below

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40 p.

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Pruess, K. May 1, 1996.

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Description

Water seepage has been numerically simulated in heterogeneous fractures, which were conceptualized as two-dimensional heterogeneous porous media. Flow was found to proceed in dendritic patterns along preferential paths, giving rise to such features as localized ponding and bypassing. Limited parameter variation studies have shown strong dependence of seepage patterns on fracture permeability and applied flow rate. The temporal evolution of seeps proceeds on a vast range of time scales. This casts doubt on the applicability of steady-state concepts for water migration in thick unsaturated zones of fractured rock where infiltration is episodic. An approximate invariance of seepage behavior was derived for simultaneous space-and-time scaling. Numerical simulation experiments have confirmed this invariance, as well as its limits of applicability.

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40 p.

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OSTI as DE97001193

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  • Other Information: PBD: May 1996

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  • Other: DE97001193
  • Report No.: LBNL--38883
  • Grant Number: AC03-76SF00098
  • DOI: 10.2172/432835 | External Link
  • Office of Scientific & Technical Information Report Number: 432835
  • Archival Resource Key: ark:/67531/metadc688840

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  • May 1, 1996

Added to The UNT Digital Library

  • July 25, 2015, 2:20 a.m.

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  • May 18, 2016, 5:49 p.m.

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Pruess, K. Numerical simulation experiments on water seepage patterns in heterogeneous, unsaturated rock fractures, report, May 1, 1996; California. (digital.library.unt.edu/ark:/67531/metadc688840/: accessed July 17, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.