TenCate Geosynthetics Netherlands bv

Rehabilitating and protecting coastline of Grand Isle - case study


Courtesy of TenCate Geosynthetics Netherlands bv

Worldwide TenCate Geotube technology is used in environmental and infrastructural projects. Currently, TenCate Geosynthetics North America is working with the US Corps of Engineers on rehabilitating and protecting the coastline of Grand Isle (Louisiana, USA). A row of TenCate Geotube GT500 containers measuring 9,600 metres in length forms the core of what will ultimately be a row of dunes. The containers replace a series of burritos (dunes) that the Corps had originally chosen but which had succumbed to the elements. The TenCate Geotube units, however, are doing just fine.

The burritos that the Corps had built here after Katrina consisted of geotextiles filled with sand and then sewn together − a construction that proved unequal to the hurricanes Gustav and Ike. The core of the new row of dunes consists of a chain of TenCate Geotube units with erosion mats in front and behind. Each tube (65 metres long and 10 meters in circumference) is filled with a mixture of sand and water that, after hardening, is expected to last 100 years. After being installed, the tubes are covered with a million cubic metres of sand from the seabed.

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