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Geotextile tubes in detail

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Geotextile dikes: an environmentally friendly and efficient coastline protection solution.


  • Protects the coastline and the terrestrial environment
  • Use of sand taken directly from the site
  • Construction of tailor made structures
  • Proven technology
  • Durable, flexible and easy to install
  • Low cost
  • Ecologically sensible solution
  • Reversible installation
  • Creation of an almost natural habitat for marine life
  • Speed of implementation


  • Dune structures
  • Creation of islands
  • Breakwaters
  • Piers/dams
  • Underwater structures

These structures are geosystems dedicated to marine applications that control and master the power of water. The effectiveness and the performance of this technology have been demonstrated many times throughout the world and more recently in France, Cannes (2011) and Sète (2012), with work carried out by SAM TRASOMAR. The structures installed by our company have experienced repeated bouts of bad weather, and have demonstrated their effectiveness and their resistance.

This process is based on a system of submarine textile tubes, filled with sand, arranged in parallel with the coastline. The goal is to strengthen the foreshore bar to mitigate swell while allowing small swells to pass and spread the effect of the breaking waves.

University studies have shown that small swells (less than 2.00m) cause sand to rise up the beach, while swells above 2.00m were a major cause of erosion. Geotextile tubes promote the natural silting of the beaches as a result.

As an alternative to the rip-rap dike system, geotextile embankments offer a definite economic benefit. A technical-financial study carried out by the BRL Design Office, shows that over a period of thirty years, these structures are less expensive than rip-rap. Indeed, they do away with the need to use blocks of rock from quarries, as construction materials are on site (filling with sand pumped from the sea). The construction of geotextile dikes thus represents savings on the cost of materials while sparing the natural resources of large rocks and avoiding the costs and disadvantages of transporting rocks by truck.

From an ecological point of view, the device is permanent and invisible. It also offers an almost natural habitat for marine life. Finally, its colour, similar to that of sand, guarantees harmonious integration with the natural environment. The high UV resistance of the tubes and their seals ensures the product’s aesthetic appearance in the long term.

The implementation process

  • Laying of mats : diving equipment, Pumps, adjusting...
  • Laying of the tube : Traso-1 pontoon

Maintenance of geotextile tubes

  • Total inspection
  • Cleaning of the structure or the periphery

The repair process

  • Repair of geotextile tubes
  • Changing bolts
  • Changing the black blind flange
  • Marker rectification operation

Main realisations

Plage du Rayol
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Plage du Lido - Sète - 2014 / 2018-2019 / 2021
in Sète
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Current and upcoming projects

  • Maritime development work ont the coast of Sainte-Maxime