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Propagation of Seasonal Temperature Signals into an Aquifer upon Bank Infiltration

2010; Wiley; Volume: 49; Issue: 4 Linguagem: Inglês

10.1111/j.1745-6584.2010.00745.x

1745-6584

Nelson Molina‐Giraldo, Peter Bayer, Philipp Blum, Olaf A. Cirpka,

Soil and Unsaturated Flow

GroundwaterVolume 49, Issue 4 p. 491-502 Propagation of Seasonal Temperature Signals into an Aquifer upon Bank Infiltration Nelson Molina-Giraldo, Corresponding Author Nelson Molina-Giraldo Center for Applied Geoscience (ZAG), University of Tübingen, Sigwartstraße 10, 72076 Tübingen, Germany; (49) 7071 2973172; fax: (49) 7071 295059; nelson.molina-giraldo@uni-tuebingen.deSearch for more papers by this authorPeter Bayer, Peter Bayer Engineering Geology, ETH Zürich, Sonneggstraße 5, 8092 Zurich, Switzerland.Search for more papers by this authorPhilipp Blum, Philipp Blum Institute for Applied Geosciences (AGW), Karlsruhe Institute of Technology (KIT), Kaiserstraße 12, 76131 Karlsruhe, Germany.Search for more papers by this authorOlaf A. Cirpka, Olaf A. Cirpka Center for Applied Geoscience (ZAG), University of Tübingen, Sigwartstraße 10, 72076 Tübingen, Germany.Search for more papers by this author Nelson Molina-Giraldo, Corresponding Author Nelson Molina-Giraldo Center for Applied Geoscience (ZAG), University of Tübingen, Sigwartstraße 10, 72076 Tübingen, Germany; (49) 7071 2973172; fax: (49) 7071 295059; nelson.molina-giraldo@uni-tuebingen.deSearch for more papers by this authorPeter Bayer, Peter Bayer Engineering Geology, ETH Zürich, Sonneggstraße 5, 8092 Zurich, Switzerland.Search for more papers by this authorPhilipp Blum, Philipp Blum Institute for Applied Geosciences (AGW), Karlsruhe Institute of Technology (KIT), Kaiserstraße 12, 76131 Karlsruhe, Germany.Search for more papers by this authorOlaf A. Cirpka, Olaf A. Cirpka Center for Applied Geoscience (ZAG), University of Tübingen, Sigwartstraße 10, 72076 Tübingen, Germany.Search for more papers by this author First published: 06 October 2010 https://doi.org/10.1111/j.1745-6584.2010.00745.xCitations: 41Read the full textAboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Share a linkShare onFacebookTwitterLinked InRedditWechat Abstract Infiltrating river water carries the temperature signal of the river into the adjacent aquifer. While the diurnal temperature fluctuations are strongly dampened, the seasonal fluctuations are much less attenuated and can be followed into the aquifer over longer distances. In one-dimensional model with uniform properties, this signal is propagated with a retarded velocity, and its amplitude decreases exponentially with distance. Therefore, time shifts in seasonal temperature signals between rivers and groundwater observation points may be used to estimate infiltration rates and near-river groundwater velocities. As demonstrated in this study, however, the interpretation is nonunique under realistic conditions. We analyze a synthetic test case of a two-dimensional cross section perpendicular to a losing stream, accounting for multi-dimensional flow due to a partially penetrating channel, convective-conductive heat transport within the aquifer, and heat exchange with the underlying aquitard and the land surface. We compare different conceptual simplifications of the domain in order to elaborate on the importance of different system elements. We find that temperature propagation within the shallow aquifer can be highly influenced by conduction through the unsaturated zone and into the underlying aquitard. In contrast, regional groundwater recharge has no major effect on the simulated results. In our setup, multi-dimensionality of the flow field is important only close to the river. We conclude that over-simplistic analytical models can introduce substantial errors if vertical heat exchange at the aquifer boundaries is not accounted for. This has to be considered when using seasonal temperature fluctuations as a natural tracer for bank infiltration. Citing Literature Volume49, Issue4July/August 2011Pages 491-502 RelatedInformation