Andreas Kortenhaus, David Schürenkamp, Thorsten Piontkowitz, Hocine Oumeraci


The ‘Falster dike’ is a system of a coastal vegetated dunes with a grass-covered sand dike protecting a low-lying area of about 7,000 summer houses, many of which being inhabited during winter, and therefore in danger of any storm surge induced flooding. The paper discusses (i) the assessment and uncertainties of relevant data such as bathymetry, topography, wind and wave data, water levels; (ii) deterministic calculations of wave run-up and overtopping of the dike without dunes; (iii) the calculations of dune erosion; and (iv) a reliability assessment of a dune and dike system. Results suggest that the dunes in front of the dikes lead to a significantly increased safety of the flood defences and will therefore withstand present and future conditions, including climate change scenarios.


sea dike; dune; reliability assessment; safety of flood defences; wave overtopping; dune erosion

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DCA 2007: Hojvandsstatistikker - Extreme sea level statistics for Denmark. Danish Coastal Authority, Lemvig, Denmark.

DHI 2006: Vandstandsstatistik for Koege Havn. DHI Institu for Vand og Miljo, Horsholm, 16 p.

DMI 2011: Wind data of Gedser Havn (01.01.06-31.08.11) and Gedser Odden (01.01.94-31.08.11),

Danmarks Meteorologiske Institut (DMI).

EAK 2002: Empfehlungen für Küstenschutzwerke. Die Küste. Archiv für Forschung und Technik an der Nord- und Ostsee, Heft 65, Boyens & Co., 589 S.

EurOtop 2007: European Overtopping Manual. Pullen, T.; Allsop, N.W.H.; Bruce, T.; Kortenhaus, A.;

FDB 2011a: Data of echo sounder measurements at east coast of Falster Island, Danish Coastal Authority, Lemvig, Denmark. unpublished.

FDB 2011b: Topography data of coastline of Southeast Falster, Falster Dike Board (FDB).

Kaste, D. 2011: Safety Assessment of the Coastal Protection System at Falster, Denmark. Diplomarbeit am Leichtweiß-Institut für Wasserbau, Fachbereich Bauingenieurwesen, Technische Universität Braunschweig, Braunschweig, Germany, 49 p., 10 appendices.

Rasmussen, F.F., K. Dreijer and G. Jørgensen. 1997: Det falsterkse dige. Nykøbing Falster, 96 p.

Roelvink, D., A. Reniers, A. van Dongeren, J. van Thiel de Vries, J. Lescinski and R. McCall. 2010: XBeach Model Description and Manual. Unesco-IHE Institute for Water Education, Deltares and Delft University of Technology, 1002266, Delft, 106 p.

Seifert, T., F. Tauber and B. Kayser. 2001: A high resolution spherical grid topography of the Baltic

Sea - 2nd edition. Baltic Sea Science Congress, 25-29. November 2001, Stockholm Poster #147.

SPM 1984: Shore protection manual, vol. I, Chapters 1 through 5. Vicksburg, Mississippi, USA, 800 p.

Streicher, M. 2012: Numerical Simulation of Coastal Dune Erosion due to Storm Surges Using XBeach. Entwurf am Leichtweiß-Institut für Wasserbau, Fachbereich Bauingenieurwesen, Technische Universität Braunschweig, Braunschweig, 79 p.

SWAN 2006: SWAN Scientific and technical documentation. Delft University of Technology, Delft, Netherlands, 126 p.

Wahl, T. 2007: Ermittlung von Seegangsbelastungen im Küstennahbereich mit dem numerischen Seegangsmodell SWAN. Diplomarbeit am Forschungsinstitut Wasser und Umwelt, Abt. Wasserbau & Hydromechanik der Universität Siegen, Siegen, 161 p.