Importance of dune erosion influencing processes

作者：den Heijer C^*; Walstra Dirk Jan R; de Vries Jaap S M van Thiel; Hoonhout Bas M; Huisman Bas J A; Diermanse Ferdinand L M; van Gelder Pieter H A J M

来源：Journal of Coastal Research, 2011, 283-287.

• Dune erosion
• storm surge
• DUROS
• D plus
• XBeach

den Heijer, C., Walstra, D.J.R., van Thiel de Vries, J.S.M., Hoonhout, B.M., Huisman, B.J.A., Diermanse, F.L.M. and van Gelder, P.H.J.H.M., 2011. A comparative analysis three of dune erosion models. Journal of Coastal Research, SI 64 (Proceedings of the 11th International Coastal Symposium), 283-287. Szczecin, Poland, ISSN 0749-0208
Dunes protect the largest part of the coastal areas in The Netherlands against the sea. Proper assessment of dune safety against flooding is essential, since these areas are densely populated and contain high economical value. The current dune safety assessment method, based on the DUROS+ model, is not applicable for a part of the coast, among others due to the occurrence of hard structures, strongly curved coastlines, very mild sloped crosss-hore profiles or shoals in front of the coast. The D++ model has been recently developed to be able to cops: with mild sloped cross-shore profiles and shoals in front of the coast. The process-based XBEACH model is more advanced, and is supposed to be able to deal with the mentioned complex situations. When applying different models for the safety assessment, consistency between the models is crucial. This paper intercompares the dune retreat distances calculated by DUROS+, D++ and X BEACH. To that end, 12 cross-shore profiles along the Dutch coast have been selected where the three used models are conceptually applicable. In general it is concluded that the three models have a similar response. DUROS+ and D++ are consistent when choosing the offshore boundary at relatively deep water. For extreme conditions, DUROS+ and D++ result in a larger retreat distance compared to XBEACH. When introducing an additional erosion contribution for uncertainty and storm duration effects to D++, as is prescribed in the Dutch dune safety assessment guidelines, it is exemplified that D++ overestimates the retreat distance with respect to XBEACH.

• 出版日期2011