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| Titel |
Coupled modelling of subsurface water flux for an integrated flood risk management |
| VerfasserIn |
T. Sommer, C. Karpf, N. Ettrich, D. Haase, T. Weichel, J.-V. Peetz, B. Steckel, K. Eulitz, K. Ullrich |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1561-8633
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| Digitales Dokument |
URL |
| Erschienen |
In: Natural Hazards and Earth System Science ; 9, no. 4 ; Nr. 9, no. 4 (2009-07-29), S.1277-1290 |
| Datensatznummer |
250006891
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| Publikation (Nr.) |
 copernicus.org/nhess-9-1277-2009.pdf |
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| Zusammenfassung |
| Flood events cause significant damage not only on the surface but also
underground. Infiltration of surface water into soil, flooding through the
urban sewer system and, in consequence, rising groundwater are the main
causes of subsurface damage. The modelling of flooding events is an important
part of flood risk assessment. The processes of subsurface discharge of
infiltrated water necessitate coupled modelling tools of both, surface and
subsurface water fluxes. Therefore, codes for surface flooding, for discharge
in the sewerage system and for groundwater flow were coupled with each other.
A coupling software was used to amalgamate the individual programs in terms
of mapping between the different model geometries, time synchronization and
data exchange. The coupling of the models was realized on two scales
in the Saxon capital of Dresden (Germany). As a result of the coupled
modelling it could be shown that surface flooding dominates processes of any
flood event. Compared to flood simulations without coupled modelling no
substantial changes of the surface inundation area could be determined.
Regarding sewerage, the comparison between the influx of groundwater into
sewerage and the loading due to infiltration by flood water showed
infiltration of surface flood water to be the main reason for sewerage
overloading. Concurrent rainfalls can intensify the problem. The infiltration
of the sewerage system by rising groundwater contributes only marginally to
the loading of the sewerage and the distribution of water by sewerage has
only local impacts on groundwater rise. However, the localization of risk
areas due to rising groundwater requires the consideration of all components
of the subsurface water fluxes. The coupled modelling has shown that high
groundwater levels are the result of a multi-causal process that occurs
before and during the flood event. |
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