10 M PR. YEAR OF DUNE FACE RETREAT RATES AT DANISH COASTLINE UNDULATIONS

On sandy coasts exposed to waves from an almost shore- parallel angle, coast undulations can be present. At Tversted beach in the northwestern part of Denmark the dune face has migrated more than 100 m seawards between 1945 and 2010. From 2010 the dune face has started moving landwards with a rate of +10 m/y for consecutive years. From 2010 to 2022 the dune face has in total migrated nearly 100 m landwards. This narrows the dune width in certain areas, making these areas prone to erosion and flooding which worries the local community. The community which has moved closer to the sea during the period of seaward migration. This study will focus on analyzing if there is a cyclicity at the coast which will cause a seaward migration of the dune face again.