Abstract
The 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.
Highlights
The Northfrisian Halligen are small undiked marsh islands which are located in the German part of the UNESCO - World Natural Heritage Wadden Sea (Fig. 1)
The Backenswarft is overflowed at seven of eight direction categories during an HWBEM as the dwelling mound was designed for this extreme water level and has settled since the construction
The Ockenswarft is overflowed only at one direction category during a design event. This quantification of safety levels has been performed for all 30 dwelling mounds on Hooge, Langeneß and Nordstrandischmoor
Summary
The Northfrisian Halligen are small undiked marsh islands which are located in the German part of the UNESCO - World Natural Heritage Wadden Sea (Fig. 1). 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. These small and only a few meters above the middle high tide situated islands are affected and worth to be protected. With respect to climate change and related changes in mean and extreme water levels, new coastal protection measures and strategies have to be developed
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