Journal of Hydroinformatics Vol 08 No 3 pp 181–192 © IWA Publishing 2006 doi:10.2166/hydro.2006.011

Inundation of the Ziltendorfer Lowland during the Odra flood 1997 and its impact on the main river – a numerical study

Hilmar Messal and Heinz-Theo Mengelkamp

GKSS Research Center Geesthacht GmbH, Max-Planck-Strasse 1, D-21502, Geesthacht, Germany Tel.: +49 4152 87 1521 1558 Fax: +49 4152 87 2020 E-mail: messal@gkss.de

GKSS Research Center Geesthacht GmbH, Max-Planck-Strasse 1, D-21502, Geesthacht, Germany Tel.: +49 4152 87 1521 1558 Fax: +49 4152 87 2020 E-mail: mengelkamp@gkss.de

The inundation of the Ziltendorfer Lowland, a farmland polder with some villages, during the major flooding event in July 1997 in the Odra watershed, is simulated with the two-dimensional hydrodynamic model TRIM2D. Inflow and outflow through three consecutive embankment breaches make up a complex flow regime which governs the inundation and the water level in the Odra river. With reasonable assumptions for the dam breach genesis the inundation and depletion are simulated in good agreement with the observed flooding front positions. Simulations with a one-dimensional hydrodynamic model for “dam breach” and “no dam breach” scenarios confirm analytical considerations of an increase of the water level downstream in the main river for the “dam breach” scenario because of an outflow from the Ziltendorfer Lowland into the Odra river during the peak flooding period.

Keywords: embankment breach; flood; inundation; lowland; Odra; Ziltendorfer Lowland

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