Abstract
The study presented here describes a method for defining set-back lines along eroding coasts. The method (a mathematical model) combines the long-term shoreline retreat trend with short-term shoreline erosion (during storms). Simulations are carried out for 2030 and compared with the beach width to determine whether the shoreline is likely to shift onshore. The mathematical model is applied to the Frontignan and Carnon beaches (south of France). Both sites possess hard engineering coastal structures and downdrift erosion on the natural beaches. The set-back lines indicate that beaches with groynes are generally wide enough to resist shoreline retreat, while the downdrift “natural” beaches are not. We discuss the possible utilisation of set-back line estimations.
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Acknowledgements
The authors wish to thank the SHOM (Service Hydrographique et Océanographique de la Marine) and the DRELR (Division Régionale ed l’Equipement du Languedoc-Roussillon) for providing access to the data. This work contributes to the ORME and PIRVE-VULIGAM programs supported by the CNRS.
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Sabatier, F., Samat, O., Brunel, C. et al. Determination of set-back lines on eroding coasts. Example of the beaches of the Gulf of Lions (French Mediterranean Coast). J Coast Conserv 13, 57–64 (2009). https://doi.org/10.1007/s11852-009-0062-y
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DOI: https://doi.org/10.1007/s11852-009-0062-y