AbstractThe Northfrisian Halligen are small undiked marsh islands and located in the German part of the UNESCO - World Natural Heritage Wadden Sea. The houses of the inhabitants are built on dwelling mounds and during storm events these mounds are the only places which are not inundated on the islands. With respect to climate change and related changes in mean and extreme water levels, new coastal protection measures and strategies have to be developed. At the Institute of Hydraulic Engineering and Water Resources Management (IWW) of the RWTH Aachen University different tools are used to evaluate and to develop new coastal protection measures and strategies for these islands. Within this project several new coastal protection measures and strategies for the Hallig islands have been developed and existing protection measures have been technically and economically evaluated. In addition, social accompanying measures were set-up to rise flood awareness and acceptance.
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