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Monitoring well responses to karst conduit head fluctuations; implications for fluid exchange and matrix transmissivity in the Floridan Aquifer

Jennifer M. Martin, Elizabeth J. Screaton and Jonathan B. Martin
Monitoring well responses to karst conduit head fluctuations; implications for fluid exchange and matrix transmissivity in the Floridan Aquifer (in Perspectives on karst geomorphology, hydrology, and geochemistry; a tribute volume to Derek C. Ford and William B. White, Russell S. Harmon (editor) and Carol M. Wicks (editor))
Special Paper - Geological Society of America (2006) 404: 209-217

Abstract

Karst aquifers with high primary-porosity matrix, such as the Floridan aquifer, have the potential for movement of water between conduits and matrix, with important implications for karst development and the maintenance of groundwater quality. The Santa Fe River Sink and River Rise conduit system, along with the surrounding unconfined Floridan aquifer in north-central Florida, provides a study area to test and quantify conceptual models of exchange between conduits and matrix. The Santa Fe River sinks underground and flows for approximately 5 km before reemerging at a first-magnitude spring, the River Rise. During February and March 2003, we recorded discharge rates into the Santa Fe River Sink and out of the River Rise along with hydraulic heads at the River Sink, River Rise, and matrix monitoring wells. Comparison of conduit and monitoring-well hydraulic heads allowed us to track the changes in hydraulic gradient between conduits and wells as a discharge peak passed through the conduits, and the observed head differences between the wells and conduit show a linear relationship with gains and losses of water from the conduit system. The responses of heads at three of the monitoring wells to changes in head within the conduits suggest a transmissivity between 950 and 160,000 m (super 2) /d, and analysis suggests that the values depend on the scale of measurement. These results demonstrate the potential for transmissivity determinations in karst aquifers by passive monitoring and are consistent with previous observations that transmissivity of karst aquifers varies with the scale over which it is measured.


ISSN: 0072-1077
EISSN: 2331-219X
Coden: GSAPAZ
Serial Title: Special Paper - Geological Society of America
Serial Volume: 404
Title: Monitoring well responses to karst conduit head fluctuations; implications for fluid exchange and matrix transmissivity in the Floridan Aquifer
Title: Perspectives on karst geomorphology, hydrology, and geochemistry; a tribute volume to Derek C. Ford and William B. White
Author(s): Martin, Jennifer M.Screaton, Elizabeth J.Martin, Jonathan B.
Author(s): Harmon, Russell S.editor
Author(s): Wicks, Carol M.editor
Affiliation: University of Florida, Department of Geological Sciences, Gainesville, FL, United States
Affiliation: U. S. Army Research Office, Environmental Sciences Division, Research Triangle Park, NC, United States
Pages: 209-217
Published: 2006
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
ISBN: 978-0-8137-2404-1
ISBN: 0-8137-2404-7
References: 25
Accession Number: 2006-075417
Categories: Hydrogeology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. chart, 1 table, sketch map
N29°49'60" - N29°55'00", W82°40'00" - W82°30'00"
Secondary Affiliation: University of Missouri-Columbia, USA, United States
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute.
Update Code: 200643
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