Phase structure within a fracture network beneath a surface pond: Field experiment

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The authors performed a simple experiment to elucidate phase structure within a pervasively fractured welded tuff. Dyed water was infiltrated from a surface pond over a 36 minute period while a geophysical array monitored the wetted region within vertical planes directly beneath. They then excavated the rock mass to a depth of {approximately}5 m and mapped the fracture network and extent of dye staining in a series of horizontal pavements. Near the pond the network was fully stained. Below, the phase structure immediately expanded and with depth, the structure became fragmented and complicated exhibiting evidence of preferential flow, fingers, irregular ... continued below

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50 p.

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GLASS JR.,ROBERT J. & NICHOLL,M.J. May 9, 2000.

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  • Sandia National Laboratories
    Publisher Info: Sandia National Labs., Albuquerque, NM, and Livermore, CA (United States)
    Place of Publication: Albuquerque, New Mexico

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Description

The authors performed a simple experiment to elucidate phase structure within a pervasively fractured welded tuff. Dyed water was infiltrated from a surface pond over a 36 minute period while a geophysical array monitored the wetted region within vertical planes directly beneath. They then excavated the rock mass to a depth of {approximately}5 m and mapped the fracture network and extent of dye staining in a series of horizontal pavements. Near the pond the network was fully stained. Below, the phase structure immediately expanded and with depth, the structure became fragmented and complicated exhibiting evidence of preferential flow, fingers, irregular wetting patterns, and varied behavior at fracture intersections. Limited transient geophysical data suggested that strong vertical pathways form first followed by increased horizontal expansion and connection within the network. These rapid pathways are also the first to drain. Estimates also suggest that the excavation captured from {approximately}10% to 1% or less of the volume of rock interrogated by the infiltration slug and thus the penetration depth could have been quite large.

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50 p.

Notes

OSTI as DE00755594

Medium: P; Size: 50 pages

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  • Journal Name: Watger Resources Research; Other Information: Submitted to Water Resources Research

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  • Report No.: SAND2000-1154J
  • Grant Number: AC04-94AL85000
  • Office of Scientific & Technical Information Report Number: 755594
  • Archival Resource Key: ark:/67531/metadc710650

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  • May 9, 2000

Added to The UNT Digital Library

  • Sept. 12, 2015, 6:31 a.m.

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  • April 13, 2017, 12:09 p.m.

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GLASS JR.,ROBERT J. & NICHOLL,M.J. Phase structure within a fracture network beneath a surface pond: Field experiment, article, May 9, 2000; Albuquerque, New Mexico. (digital.library.unt.edu/ark:/67531/metadc710650/: accessed November 19, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.