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Transit times for water in a small till catchment from a step shift in the oxygen 18 content of the water input
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, Department of Naturegeography.
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, Department of Naturegeography.
1996 (English)In: Water resources research, ISSN 0043-1397, E-ISSN 1944-7973, Vol. 32, no 12, 3497-3511 p.Article in journal (Refereed) Published
Abstract [en]

A 6,300-m(2) catchment in SW Sweden was covered by a roof and irrigated by deacidified lake water. The delta(18)O of lake water differed from that of soil water and groundwater in the catchment, making it possible to follow the replacement of old (preirrigation) water by new (irrigation) water. After 7.5 months of irrigation the old water in the catchment had been replaced by new water. The breakthrough curve for new water gave a nearly exponential distribution of flow corrected transit times, with a mean transit time corresponding to a runoff of 54 mm. The estimated outflow of old water by runoff and evapotranspiration, 186 mm, compared well with independent estimates of the water storage at the onset of irrigation, 205 mm. The spatial pattern of the delta(18)O of soil water and groundwater within the catchment demonstrated the strong influence of the topography on the water flow.

Place, publisher, year, edition, pages
1996. Vol. 32, no 12, 3497-3511 p.
Identifiers
URN: urn:nbn:se:uu:diva-140523ISI: A1996VW15300008OAI: oai:DiVA.org:uu-140523DiVA: diva2:383733
Available from: 2011-01-05 Created: 2011-01-05 Last updated: 2017-12-11

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