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Preliminary interpretation of tracer experiments conducted in a discrete rock fracture under conditions of natural flow
Author(s) -
Novakowski K. S.,
Lapcevic P. A.,
Voralek J.,
Bickerton G.
Publication year - 1995
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/95gl00569
Subject(s) - tracer , geology , borehole , dilution , groundwater , fracture (geology) , diffusion , oil shale , flow (mathematics) , matrix (chemical analysis) , groundwater flow , mineralogy , soil science , geotechnical engineering , mechanics , aquifer , materials science , thermodynamics , physics , paleontology , nuclear physics , composite material
The results and preliminary interpretation of two tracer experiments conducted under natural flow conditions are presented. The experiments were conducted in a horizontal fracture at a depth of 10 m in a shale and limestone formation. The transport of a conservative tracer was followed over a distance of as much as 40 m in a 27‐borehole array. Observation of the pathways of tracer migration and interpretation of the transport process using a one‐dimensional model showed that transverse dispersion and matrix diffusion are likely the predominant processes responsible for spreading and slowing the migration of the solute. Groundwater velocity estimates obtained from the tracer experiments are also compared to estimates obtained using point dilution methods.