Geotextile tubes are more and more used in maritime field as protection systems (breakwaters, groin, and artificial reef?). They are constantly subjected to ocean hydrodynamic forces. Studying stability of these structures against these agents is a very important task in their dimensioning process because a lack of stability will destroy theme. In literature, there are not yet enough safe, certain and approved formulae or methods to studying stability against wave attack. This is the reason why designers around the world still prefer work with traditional solution (conventional breakwaters with rocks) than these innovative ones. This paper proposes two new formulas to studying stability of geotextile tubes against wave attack. A new called number of stability depending on the degree of filling, the average period and the duration of storm is carried out.
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