ABSTRACT

Senechal, N.; Pavon, J.; Asselot, R.; Castelle, B.; Taaouati, M.; Ferreira, S., and Bujan, S., 2016. Recovery assessment of two nearby sandy beaches with contrasting anthropogenic and sediment supply settings. In: Vila-Concejo, A.; Bruce, E.; Kennedy, D.M., and McCarroll, R.J. (eds.), Proceedings of the 14th International Coastal Symposium (Sydney, Australia). Journal of Coastal Research, Special Issue, No. 75, pp. 462–466. Coconut Creek (Florida), ISSN 0749-0208.

The aim of this study is to provide the preliminary results of the comparisons of two field sites exposed to the same environmental conditions but with contrasting beach management strategies. Truc Vert beach and Biscarrosse beach are both low sandy beaches situated on the 250km long linear French coast exposed to the Atlantic swells and are about 35km distant. While Truc Vert beach is a fully natural beach, Biscarrosse beach is in an urban area where several coastal defences have been deployed. Data indicate that Biscarrosse beach is less stable than Truc Vert beach. During the dramatic winter 2014 Biscarrosse upper beachface experienced dramatic beach erosion over two consecutive months despite regular beach nourishment operations while at the same time, Truc Vert beach erosion was mostly associated to the first energetic period. Both sites partially recovered over the summer period, especially the upper beachface where the berm generally developped during the summer. While recovery was a fully natural process at Truc Vert beach, massive beach nourishments were operated at Biscarrosse beach. Data indicate that Truc Vert upper beachface remained more stable over the following winter compared to Biscarrosse upper beachface what experienced significant variations. It is concluded that the erosion problem and recovery are very complex and certainly do not only depend on the local availability of sediment.

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