The Halligen are small marsh islands that have been strongly reduced in size the last centuries due to cliff erosion. Stone revetments have been placed to prevent further shoreline retreat, but it reduces sediment accumulation and salt intrusion on the salt marshes. Accumulation of sediment on the salt marshes is necessary to balance sea-level rise, and regular salt intrusion is crucial to avoid deterioration of the salt marshes. Multi-stakeholder approaches will be used to develop a set of locally accepted solutions. The preferred solutions will be modelled to test the full scale application. This knowledge will actively contribute to the development of Nature-based Solutions elsewhere.
