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Deicke, M., Karius, V., Jahnke, W., Kallweit, W., Rebens, M., Reyer, D.. Charakterisierung von Sturmflutablagerungen auf Hallig Hooge - Quantifizierung des Sedimentwachstums seit 1914 -. In: Gönnert, G., Pflüger, B., Bremer, J.-A. (eds.). Von der Geoarchäologie über die Küstendynamik zum Küstenzonenmanagement. Coastline Reports (9), pp. 93-102. EUCC - The Coastal Union, Leiden, 2007.


The surface of the archipelago „Halligen“ in the North Sea west of Schleswig-Holstein is only a few decimetre above sea level and the shorelines of these islands are not protected by dykes. The islands are frequently flooded during storm events mostly during the winter season. The inhabitants live on artificial hills, so called “Warften” 4 – 5 m above the island surfaces. Thus, this environment seems to be severely endangered by global warming and sea level rise. On the other hand, sedimentation of sandy-silty material occurs during each flooding. This process increases the islands surface steadily. Hallig Hooge e.g. is surrounded by a small dyke since 1914 which protects the island against weaker storms and spring tides during the summer. Still, Hooge is flooded about five times per year in average. The construction of the dyke is most probably the reason for a pronounced change in the sedimentation patterns within the marshy soil of Hooge. 44 soil soundings, 7 outcrops and 2 soil cores were examined for layers indicating a change in the sedimentation regime due to the construction of the dyke. An increase of the island surface since 1914 of up to 1.13 m at the margin and about 0.50 m in the central parts of Hooge was calculated. This is about 0.5 – 1.2 cm/a. Within the layers younger than 1914 the grain size decreases from the dyke to the central parts of the island. 52 sediment traps were installed during the winter season 2006/2007. During this period an average of 1.5 mm sediment increased the island surface, though the rate was higher at the outer parts of Hooge. So far it is unknown if a small dyke like the one at Hooge will be conducive to the sedimentation rate on a Hallig.

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