Publications
NIBIOs employees contribute to several hundred scientific articles and research reports every year. You can browse or search in our collection which contains references and links to these publications as well as other research and dissemination activities. The collection is continously updated with new and historical material.
2011
Authors
Arnstein Øvrum Kyrre RickertsenAbstract
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Atle HaugeAbstract
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Authors
Tor J. JohansenAbstract
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Cecilie Marie Mejdell Grete Helen Meisfjord Jørgensen Therese Rehn Linda J Keeling Kjersti Elisabeth Fremstad Knut Egil BøeAbstract
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Authors
Cecilie Marie Mejdell Grete Helen Meisfjord Jørgensen Therese Rehn Linda J Keeling Knut Egil BøeAbstract
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Authors
Erlend Nybakk Anssi Niskanen Fahrudin Bajric Gabriel Duduman Diana Feliciano Krzysztof Jablonski Anders Lunnan Liana Sadauskiene Bill Slee Meelis TederAbstract
No abstract has been registered
Abstract
For tracer studies at the catchment scale, travel times are often assumed to be stationary. We question the validity of this assumption. We analyzed a series of tracer experiments conducted under exceptionally controlled conditions at Gårdsjön, Sweden. The Gårdsjön G1 catchment was covered by a roof underneath which natural throughfall has been replaced by artificial irrigation with a pre-defined chemical composition. This unique setup was used to perform replicated catchment scale Br tracer experiments under steady state storm flow conditions in five different years. A log-normal distribution function was fitted to all Br breakthrough curves. Fitted parameter values differed significantly for some of the experiments. These differences were not only related to the slightly different hydrologic boundary and initial conditions for the experiments, but also to seasonal changes in catchment properties that may explain the different flow paths during the experiments. We conclude that the travel time distribution is not only linked to discharge but also explicitly related to other water fluxes such as evapotranspiration, and that it is not stationary even under steady-state flow conditions. Since the attenuation of soluble pollutants is fundamentally linked to the travel times of water through the subsurface of a catchment, it is of crucial importance to understand the latter in detail. However, it is still unclear which are the dominant processes controlling their distribution.