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Journal Article

On the role of floodplain storage and hydrodynamic interactions in flood risk estimation

Authors
/persons/resource/mofarrag

Farrag,  Mostafa
4.4 Hydrology, 4.0 Geosystems, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

/persons/resource/fbrill

Brill,  Fabio
4.4 Hydrology, 4.0 Geosystems, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

/persons/resource/dung

Nguyen,  D.
4.4 Hydrology, 4.0 Geosystems, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

/persons/resource/nivedita

Sairam,  N.
4.4 Hydrology, 4.0 Geosystems, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

/persons/resource/kschroet

Schröter,  Kai
4.4 Hydrology, 4.0 Geosystems, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

/persons/resource/kreib

Kreibich,  H.
4.4 Hydrology, 4.0 Geosystems, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

/persons/resource/bmerz

Merz,  B.
4.4 Hydrology, 4.0 Geosystems, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

de Bruijn,  Karin M.
External Organizations;

/persons/resource/vorogus

Vorogushyn,  S.
4.4 Hydrology, 4.0 Geosystems, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

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Fulltext (public)

5010419.pdf
(Publisher version), 32MB

Supplementary Material (public)
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Citation

Farrag, M., Brill, F., Nguyen, D., Sairam, N., Schröter, K., Kreibich, H., Merz, B., de Bruijn, K. M., Vorogushyn, S. (2022): On the role of floodplain storage and hydrodynamic interactions in flood risk estimation. - Hydrological Sciences Journal - Journal des Sciences Hydrologiques, 67, 4, 508-534.
https://doi.org/10.1080/02626667.2022.2030058


Cite as: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5010419
Abstract
Hydrodynamic interactions, i.e. the floodplain storage effects caused by inundations upstream on flood wave propagation, inundation areas, and flood damage downstream, are important but often ignored in large-scale flood risk assessments. Although new methods considering these effects sometimes emerge, they are often limited to a small or meso scale. In this study, we investigate the role of hydrodynamic interactions and floodplain storage on flood hazard and risk in the German part of the Rhine basin. To do so, we compare a new continuous 1D routing scheme within a flood risk model chain to the piece-wise routing scheme, which largely neglects floodplain storage. The results show that floodplain storage is significant, lowers water levels and discharges, and reduces risks by over 50%. Therefore, for accurate risk assessments, a system approach must be adopted, and floodplain storage and hydrodynamic interactions must carefully be considered.