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| Titel |
Recharge estimation and soil moisture dynamics in a Mediterranean, semi-arid karst region |
| VerfasserIn |
F. Ries, J. Lange, S. Schmidt, H. Puhlmann, M. Sauter |
| 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. 3 ; Nr. 19, no. 3 (2015-03-20), S.1439-1456 |
| Datensatznummer |
250120663
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| Publikation (Nr.) |
 copernicus.org/hess-19-1439-2015.pdf |
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| Zusammenfassung |
Knowledge of soil moisture dynamics in the unsaturated soil zone provides
valuable information on the temporal and spatial variability of groundwater
recharge. This is especially true for the Mediterranean region, where a
substantial fraction of long-term groundwater recharge is expected to occur
during high magnitude precipitation events of above-average wet winters. To
elucidate process understanding of infiltration processes during these
extreme events, a monitoring network of precipitation gauges, meteorological
stations, and soil moisture plots was installed in an area with a steep
climatic gradient in the Jordan Valley region. In three soil moisture plots,
Hydrus-1D was used to simulate water movement in the unsaturated soil zone
with soil hydraulic parameters estimated by the Shuffled Complex Evolution
Metropolis algorithm. To generalize our results, we modified soil depth and
rainfall input to simulate the effect of the pronounced climatic gradient and
soil depth variability on percolation fluxes and applied the calibrated model
to a time series with 62 years of meteorological data.
Soil moisture measurements showed a pronounced seasonality and suggested
rapid infiltration during heavy rainstorms. Hydrus-1D successfully simulated
short and long-term soil moisture patterns, with the majority of simulated
deep percolation occurring during a few intensive rainfall events.
Temperature drops in a nearby groundwater well were observed synchronously
with simulated percolation pulses, indicating rapid groundwater recharge
mechanisms. The 62-year model run yielded annual percolation fluxes of up to
66% of precipitation depths during wet years and of 0% during dry
years. Furthermore, a dependence of recharge on the temporal rainfall
distribution could be shown. Strong correlations between depth of recharge
and soil depth were also observed. |
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