NEW DESIGN OF THE BALTRUM DUNE REVETMENT BASED ON HYDRAULIC MODEL TESTS

Frank Thorenz, Holger Blum, Andreas Kortenhaus

Abstract


The sandy barrier island of Baltrum is located in the north-western part of the German Federal State Lower Saxony in the North Sea. The north-western part of the island is protected by a dune revetment against storm surges and erosion. In order to determine the functionality and loading of the construction under design storm surge conditions and investigate planning alternatives, numerical modeling of sea state conditions in combination with hydraulical model tests for the construction were executed. Measured overtopping rates of up to 125 l/(s.m) and loads up to 150 kPa showed the necessity to strengthen and heighten the initial construction. A combination of wall elements for wave run-up and overtopping reduction in combination with a crest wall were designed in order to meet the technical demands of coastal defence as well as the touristical needs of an important recreation locality.

Keywords


dune revetment; wave return wall; hydraulic model tests; overtopping

References


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Liebisch, S., A. Kortenhaus, H. Oumeraci, F. Thorenz, and H. Blum. (2011): Wellenüberlauf und welleninduzierte Belastung des Deckwerks auf der Insel Baltrum, 8. FZK-Kolloquium - Maritimer Wasserbau und Küsteningenieurwesen, Forschungszentrum Küste, 69-74.

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