Intra-catchment variability of surface saturation – insights from physically based simulations in comparison with biweekly thermal infrared image observations
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Published:2020-03-26
Issue:3
Volume:24
Page:1393-1413
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ISSN:1607-7938
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Container-title:Hydrology and Earth System Sciences
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language:en
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Short-container-title:Hydrol. Earth Syst. Sci.
Author:
Glaser BarbaraORCID, Antonelli MartaORCID, Hopp Luisa, Klaus JulianORCID
Abstract
Abstract. In this study, we explored the spatio-temporal variability of surface
saturation within a forested headwater catchment using a combined
simulation–observation approach. We simulated the occurrence of surface
saturation in the Weierbach catchment (Luxembourg) with the physically based model HydroGeoSphere. We confronted the simulation with thermal infrared
images that we acquired during a 2-year mapping campaign for seven
distinct riparian areas with weekly to biweekly recurrence frequency.
Observations and simulations showed similar saturation dynamics across the
catchment. The observed and simulated relation of surface saturation to
catchment discharge resembled a power law relationship for all investigated
riparian areas but varied to a similar extent, as previously observed
between catchments of different morphological and topographical
characteristics. The observed spatial patterns and frequencies of surface
saturation varied between and within the investigated areas and the model
reproduced these spatial variations well. The good performance of the
simulation suggested that surface saturation in the Weierbach catchment is
largely controlled by exfiltration of groundwater into local topographic
depressions. However, the simulated surface saturation contracted faster
than observed, the simulated saturation dynamics were less variable between
the investigated areas than observed, and the match of simulated and
observed saturation patterns was not equally good in all investigated
riparian areas. These mismatches between observations and simulation
highlight that the intra-catchment variability of surface saturation must
also result from factors that were not considered in the model set-up, such
as differing subsurface structures or a differing persistence of surface
saturation due to local morphological features like perennial springs.
Funder
FP7 People: Marie-Curie Actions Fonds National de la Recherche Luxembourg
Publisher
Copernicus GmbH
Subject
General Earth and Planetary Sciences,General Engineering,General Environmental Science
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