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| Titel |
An advanced approach for catchment delineation and water balance modelling within wetlands and floodplains |
| VerfasserIn |
S. Krause, A. Bronstert |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7340
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| Digitales Dokument |
URL |
| Erschienen |
In: Proceedings of the 8th Workshop for Large Scale Hydrological Modelling - Oppurg 2004 ; Nr. 5 (2005-12-16), S.1-5 |
| Datensatznummer |
250002159
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| Publikation (Nr.) |
 copernicus.org/adgeo-5-1-2005.pdf |
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| Zusammenfassung |
| Water balance of wetlands within lowland floodplains is strongly
influenced by the temporally variable spatial extent of the interactions
between groundwater and surface water. A robust algorithm will be introduced
which makes it possible to delineate the interaction zone between the
lowland river and the floodplain. This interaction zone is specified as the
"Direct Catchment" which is defined by the part of the connected
floodplain in which wetland water balance is mainly affected by the surface
water dynamics of the adjacent river. The delineation algorithm is based on
transfer functions which were assessed by local simulation results of the
integrated water balance and nutrient dynamics model IWAN. The transfer
functions are further determined by mean annual groundwater depths and by
simulated groundwater dynamics. They are controlled by simulation results of
the maximal transversal extent of surface water influence on groundwater
stages. The regionalisation of the developed delineation algorithm leads to
the specification of the maximal extent of groundwater - surface water -
interaction processes along the river. By application of this approach to
the Havel River basin, located within lowlands of Northeaster Germany, it
was possible to specify a 998.1 km2 part of the floodplain which is
directly connected with the surface waters and thus called the "Direct
Catchment" of the Havel river. The IWAN model was applied to simulate the
water balance of the floodplain. The simulation results prove the tight
interaction between river and floodplain. It is shown that the spatially and
temporally variable influences of the connected floodplain on the river
discharge were only important during low discharge in summer. |
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