AbstractFrontignan is located in south of France, along the Mediterranean coast at approximately 20km south of the city of Montpellier. The studied area is 7km long and is characterized by a sand barrier which separates the sea from a large lagoon well known for its ecological interest. In this area, the tourist traffic is significant and is vital for many economic and social activities. The studied area is divided into two main areas: 1) The urbanized area of Frontignan, long of approx. 4.7km, starting from the fish harbor to the Tamaris camping. The marina of Frontignan is located in the middle of this area which is protected by many coastal structures (groynes). In this area the barrier is 100m to 500m wide. 2) The less urban area long of approx. 2.3km.
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