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Water transit times and flow paths from two line injections of 3H and 36Cl in a microcatchment at Gårdsjön, Sweden
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences.
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences.
1999 (English)In: Hydrological Processes, ISSN 0885-6087, E-ISSN 1099-1085, Vol. 13, no 11, 1557-1575 p.Article in journal (Refereed) Published
Abstract [en]

To investigate groundwater transit times and flow paths in shallow till soil, within an acidification study at Gardsjon, Sweden, two line injections of Cl-36 and H-3 Were made in groundwater during 1992. The first injection in January, when the two tracers were injected at the same depth, gave tracer transit times from injection line to outlet of some hours due to a runoff event on the first day. The subsequent recession period left a considerable amount of tracer in the unsaturated zone, which had transit times that ranged from weeks to months. Tracer recovery at the outlet was 78% for H-3 and 47% for Cl-36. Cl retention was indicated. The second injection in November, when H-3 was injected at 30 cm depth and 36C1 at 60 cm depth, gave recoveries of 96% for H-3 and 83% for Cl-36. Apart from an advective flow-dependent tracer transport, very fast tracer pulses occurred. The velocities for those pulses were of the order of tens of metres per hour. Highest tracer concentrations were observed in the superficial soil layers, which suggest that these layers were the dominant flow paths. 

Place, publisher, year, edition, pages
1999. Vol. 13, no 11, 1557-1575 p.
Keyword [en]
transit times, flow paths, tracer, chlorine-36, tritium, groundwater, soil water, Gardsjon
National Category
Earth and Related Environmental Sciences
Identifiers
URN: urn:nbn:se:uu:diva-140522DOI: 10.1002/(SICI)1099-1085(19990815)13:11<1557::AID-HYP835>3.0.CO;2-SISI: 000082108900002OAI: oai:DiVA.org:uu-140522DiVA: diva2:383735
Available from: 2011-01-05 Created: 2011-01-05 Last updated: 2017-12-11Bibliographically approved

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