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| Titel |
The effectiveness of polder systems on peak discharge capping of floods along the middle reaches of the Elbe River in Germany |
| VerfasserIn |
S. Huang, J. Rauberg, H. Apel, M. Disse, K.-E. Lindenschmidt |
| 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 ; 11, no. 4 ; Nr. 11, no. 4 (2007-07-03), S.1391-1401 |
| Datensatznummer |
250009393
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| Publikation (Nr.) |
 copernicus.org/hess-11-1391-2007.pdf |
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| Zusammenfassung |
| In flood modelling, many one-dimensional (1-D) hydrodynamic models are too
restricted in capturing the spatial differentiation of processes within a
polder or system of polders and two-dimensional (2-D) models are very
demanding in data requirements and computational resources. The latter is an
important consideration when uncertainty analyses using the Monte Carlo
techniques are to complement the modelling exercises. This paper describes
the development of a quasi-2-D modeling approach, which still calculates the
dynamic wave in 1-D but the discretisation of the computational units are in
2-D, allowing a better spatial representation of the flow in polders and
avoiding large additional expenditure on data pre-processing and
computational time. The model DYNHYD (1-D hydrodynamics) from the WASP5
modeling package was used as a basis for the simulations and extended to
incorporate the quasi-2-D approach. A local sensitivity analysis shows the
sensitivity of parameters and boundary conditions on the filling volume of
polders and capping of the peak discharge in the main river system. Two
flood events on the Elbe River, Germany were used to calibrate and test the
model. The results show a good capping effect on the flood peak by the
proposed systems. The effect of capping reduces as the flood wave propagates
down stream from the polders (up to 0.5 cm of capping is decreased for each
additional kilometer from the polder). |
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