Document Detail

Freeze Core Sampling to Validate Time-Lapse Resistivity Monitoring of the Hyporheic Zone.
MedLine Citation:
PMID:  23036232     Owner:  NLM     Status:  Publisher    
A freeze core sampler was used to characterize hyporheic zone storage during a stream tracer test. The pore water from the frozen core showed tracer lingered in the hyporheic zone after the tracer had returned to background concentration in collocated well samples. These results confirmed evidence of lingering subsurface tracer seen in time-lapse electrical resistivity tomographs. The pore water exhibited brine exclusion (ion concentrations in ice lower than source water) in a sediment matrix, despite the fast freezing time. Although freeze core sampling provided qualitative evidence of lingering tracer, it proved difficult to quantify tracer concentration because the amount of brine exclusion during freezing could not be accurately determined. Nonetheless, the additional evidence for lingering tracer supports using time-lapse resistivity to detect regions of low fluid mobility within the hyporheic zone that can act as chemically reactive zones of importance in stream health.
Laura Toran; Brian Hughes; Jonathan Nyquist; Robert Ryan
Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-10-4
Journal Detail:
Title:  Ground water     Volume:  -     ISSN:  1745-6584     ISO Abbreviation:  Ground Water     Publication Date:  2012 Oct 
Date Detail:
Created Date:  2012-10-5     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9882886     Medline TA:  Ground Water     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Copyright Information:
© 2012, The Author(s). Ground Water © 2012, National Ground Water Association.
Department of Earth and Environmental Science, Temple University, Philadelphia, PA 19122. Department of Civil and Environmental Engineering, Temple University, Philadelphia, PA 19122.
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