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Longshore sediment transport and coastal erosion at Skallingen, Denmark

Abstract Within the past thirty years, the subaerial sand budget of the barrier spit Skallingen has changed from positive to negative and the foredunes are presently receding by 3–4 m/year. Volumetric losses on the barrier during the past 30 years have been computed and compared to theoretically estimated longshore sediment transport rates. It is highly likely that the sand lost from the barrier is being transported southward into the tidal inlet of Grådyb. Computations suggest that a century ago, net longshore transport rates were perhaps only about 15% of current rates. The reasons for the increased net transport and sediment losses appear to be long-term changes in the wind climate and dredging of Grådyb which cuts off any sediment supply from southerly sources. The latter has resulted in long term erosion of the northern part of the ebb delta and subsequent reorientation of the shoreline at the southern part of Skallingen