Comparison of discharge, chloride, temperature, uranine, δD, and suspended sediment responses from a multiple tracer test in karst

A controlled recharge event with multiple tracers was conducted on August 30, 2010. A pool adjacent to a sinkhole was filled with approximately 13,000 L of water. The water was heated, and salt, deuterium oxide, and uranine were added. The pool was then emptied into the sinkhole, and data were colle...

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Bibliographic Details
Published in:Carbonates and evaporites 2013-05, Vol.28 (1-2), p.191-199
Main Authors: Luhmann, Andrew J., Covington, Matthew D., Alexander, Scott C., Chai, Su Yi, Schwartz, Benjamin F., Groten, Joel T., Alexander, E. Calvin
Format: Article
Language:English
Subjects:
Aquifers
Chloride
Chlorides
Deuterium
Discharge
Earth and Environmental Science
Earth Sciences
Feasibility studies
Geology
Heavy water
Karst
Mineral Resources
Mineralogy
Original Article
Pressure
Recharge
Sediments
Sinkholes
Spring
Suspended sediments
Tracers
Water
Water temperature
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Summary:A controlled recharge event with multiple tracers was conducted on August 30, 2010. A pool adjacent to a sinkhole was filled with approximately 13,000 L of water. The water was heated, and salt, deuterium oxide, and uranine were added. The pool was then emptied into the sinkhole, and data were collected at Freiheit Spring approximately 95 m north of the sinkhole to monitor changes in discharge, temperature, conductivity/chloride, δD, uranine, and suspended sediment. This combined trace demonstrated the feasibility and utility of conducting superimposed physical, chemical, and isotopic traces. Flow peaked first at the spring and was followed by a suspended sediment peak; then essentially identical uranine, chloride, and δD peaks; and finally a temperature peak. The initial increase in flow at the spring recorded the time at which the water reached a submerged conduit, sending a pressure pulse to the spring at the speed of sound. The initial increase in uranine, chloride, and δD at the spring recorded the arrival of the recharge water. The initial change in temperature and its peak occurred later than the same parameters in the uranine, chloride, and δD breakthrough curves. As water flowed along this flow path, water temperature interacted with the aquifer, producing a delayed, damped thermal peak at the spring. The combination of conservative and nonconservative tracers illustrates unique pressure, advective, and interactive processes.
ISSN:0891-2556
1878-5212
DOI:10.1007/s13146-013-0127-8