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| Titel |
Quantification of the contribution of the Beauce groundwater aquifer to the discharge of the Loire River using thermal infrared satellite imaging |
| VerfasserIn |
E. Lalot, F. Curie, V. Wawrzyniak, F. Baratelli, S. Schomburgk, N. Flipo, H. Piegay, F. Moatar |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1027-5606
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| Digitales Dokument |
URL |
| Erschienen |
In: Hydrology and Earth System Sciences ; 19, no. 11 ; Nr. 19, no. 11 (2015-11-09), S.4479-4492 |
| Datensatznummer |
250120845
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| Publikation (Nr.) |
 copernicus.org/hess-19-4479-2015.pdf |
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| Zusammenfassung |
| Seven Landsat thermal infrared (TIR) images taken over the period 2000–2010
were used to establish longitudinal temperature profiles of the middle Loire
River where it flows above the Beauce aquifer. The groundwater discharge
along the river course was quantified for each identified groundwater
catchment area using a heat budget based on temperature variations of the
Loire River estimated from the TIR images. The results showed that 75 %
of the temperature differences, between in situ observations and TIR
image-based estimations, remained within the ±1 °C interval. The
main discharge area of the Beauce aquifer into the Loire River was located
between river kilometers 630 and 650, where there was a temperature drop of
1–1.5 °C in the summer and a rise of 0.5 °C in winter.
According to the heat budgets, groundwater discharge was higher during the
winter period (13.5 m3 s−1) than during the summer period
(5.3 m3 s−1). These findings are in line with the results of
both a groundwater budget and a process-based distributed hydrogeological
model. Groundwater input was also found to be higher during the Loire's flow
recession periods. |
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