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| Titel |
The effect of spatial throughfall patterns on soil moisture patterns at the hillslope scale |
| VerfasserIn |
A. M. J. Coenders-Gerrits, L. Hopp, H. H. G. Savenije, L. Pfister |
| 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 ; 17, no. 5 ; Nr. 17, no. 5 (2013-05-07), S.1749-1763 |
| Datensatznummer |
250018869
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| Publikation (Nr.) |
 copernicus.org/hess-17-1749-2013.pdf |
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| Zusammenfassung |
| Improving the understanding of the controls on subsurface stormflow
generation has been the goal of numerous experimental and modeling studies.
However, the effect of the spatial variability of throughfall on soil
moisture patterns and subsurface stormflow (SSF) generation has not yet been
studied in detail. The objectives of this study are three-fold: (1) to
investigate the influence of a spatially variable throughfall pattern on soil
moisture; (2) to investigate if soil moisture patterns reflect a balance
between a throughfall and bedrock topography patterns; and (3) to investigate
how this balance changes when soil depth, storm size and slope angle are
varied. Virtual experiments are used to address these questions. A virtual
experiment is a numerical experiment driven by collective field intelligence.
It provides a learning tool to investigate the effect of individual processes
in a complex system. In our virtual experiment we combined spatial
throughfall data from the Huewelerbach catchment in Luxembourg with the
topography of a well-studied hillslope within the Panola Mountain Research
Watershed, Georgia, USA. We used HYDRUS-3D as a modeling platform. The
virtual experiment shows that throughfall patterns influence soil moisture
patterns, but only during and shortly after a storm. With a semi-variogram
analysis we showed how the effective range of the soil moisture pattern
(i.e., the main descriptor of a spatial pattern in case of a small nugget to
sill ratio), is similar to the effective range of the throughfall pattern
during the storm and gradually returns to the effective range of the bedrock
topography after throughfall has ceased. The same analysis was carried out to
investigate how this balance changes due to changes in storm size, soil
depth, and slope. The analysis showed that the throughfall pattern is more
important during large storms on gentle slopes. For steeper slopes the
bedrock topography becomes more important. |
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