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| Titel |
Catchment-scale non-linear groundwater-surface water interactions in densely drained lowland catchments |
| VerfasserIn |
Y. Velde, G. H. Rooij, P. J. J. F. Torfs |
| 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 ; 13, no. 10 ; Nr. 13, no. 10 (2009-10-14), S.1867-1885 |
| Datensatznummer |
250012023
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| Publikation (Nr.) |
 copernicus.org/hess-13-1867-2009.pdf |
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| Zusammenfassung |
| Freely discharging lowland catchments are characterized by a strongly seasonal
contracting and expanding system of discharging streams and ditches. Due to
this rapidly changing active channel network, discharge and solute transport
cannot be modeled by a single characteristic travel path, travel time
distribution, unit hydrograph, or linear reservoir. We propose a systematic
spatial averaging approach to derive catchment-scale storage and discharge
from point-scale water balances. The effects of spatial heterogeneity in
soil properties, vegetation, and drainage network are lumped and described
by a relation between groundwater storage and the spatial probability
distribution of groundwater depths with measurable parameters. The model
describes how, in lowland catchments, the catchment-scale flux from
groundwater to surface water via various flow routes is affected by a
changing active channel network, the unsaturated zone and surface
ponding. We used observations of groundwater levels and catchment discharge
of a 6.6 km2 Dutch watershed in combination with a high-resolution
spatially distributed hydrological model to test the model approach. Good
results were obtained when modeling hourly discharges for a period of eight
years. The validity of the underlying assumptions still needs to be tested
under different conditions and for catchments of various sizes.
Nevertheless, at this stage the model can already improve monitoring
efficiency of groundwater-surface water interactions. |
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