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

Abstract

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.

Authors:
;
Publication Date:
Research Org.:
Sandia National Labs., Albuquerque, NM (US); Sandia National Labs., Livermore, CA (US)
Sponsoring Org.:
US Department of Energy (US)
OSTI Identifier:
755594
Report Number(s):
SAND2000-1154J
TRN: AH200021%%41
DOE Contract Number:  
AC04-94AL85000
Resource Type:
Journal Article
Journal Name:
Watger Resources Research
Additional Journal Information:
Other Information: Submitted to Water Resources Research; PBD: 9 May 2000
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; 58 GEOSCIENCES; TUFF; FRACTURED RESERVOIRS; PHASE STUDIES; GEOLOGIC FRACTURES; MAPPING; FLUID FLOW; FIELD TESTS

Citation Formats

GLASS JR.,ROBERT J., and NICHOLL,M.J. Phase structure within a fracture network beneath a surface pond: Field experiment. United States: N. p., 2000. Web.
GLASS JR.,ROBERT J., & NICHOLL,M.J. Phase structure within a fracture network beneath a surface pond: Field experiment. United States.
GLASS JR.,ROBERT J., and NICHOLL,M.J. Tue . "Phase structure within a fracture network beneath a surface pond: Field experiment". United States. https://www.osti.gov/servlets/purl/755594.
@article{osti_755594,
title = {Phase structure within a fracture network beneath a surface pond: Field experiment},
author = {GLASS JR.,ROBERT J. and NICHOLL,M.J.},
abstractNote = {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.},
doi = {},
journal = {Watger Resources Research},
number = ,
volume = ,
place = {United States},
year = {2000},
month = {5}
}