Geomaterial web, comprising - a first organic structural material and a second structural material, different from the first, which is connected to each other with the first structural material to form a planar composite material web extending in two mutually perpendicular directions, characterized in that the first structural material is an organic material and the second structural material is an organic or inorganic material, - the first structural material has a first biodegradability to the extent that - In a composting test with the following parameters: ∘ Samples with a length of 10 cm, a width of 10 cm and an original material thickness ∘ 50 ∘ C + / − 5 ∘ C ∘ thermophilic conditions according to ISO 16929, ∘ Sieving out the solids after six months in a sieve with a mesh size of 2 mm (mesh 8.75) less than 80 % by weight, in particular less than 50 % by weight, less than 25 % by weight or less than 10 % by weight of the dry mass of the starting material remains in the sieve during sieving, or - in a marine incubation test, with the following parameters: ∘ Samples with a length of 2 cm, a width of 2 cm and an original material thickness ∘ 30 ∘ C + / − 2 ∘ C ∘ aerobic conditions in seawater with a salt content of 3.5 wt.% +/- 1 wt.%, ∘ Sieving out the solids after 4, 8 and 12 weeks in a sieve with a mesh size of 2 mm (mesh 8.75) less than 80 % by weight, in particular less than 50 % by weight, less than 25 % by weight or less than 10 % by weight of the dry mass of the starting material remains in the sieve after 12 weeks, and the second structural material has a second biodegradability which is different from the first biodegradability, in particular is lower than the first biodegradability and in that the first structural material is arranged in the geomaterial web in such a way that, after partial or complete biodegradation of the first structural material, openings are formed in the geomaterial web passing through the geomaterial web, - a first organic structural material and a second structural material, different from the first, which is connected to each other with the first structural material to form a planar composite material web extending in two mutually perpendicular directions, characterized in that the first structural material is an organic material and the second structural material is an organic or inorganic material, - the first structural material has a first biodegradability to the extent that - In a composting test with the following parameters: ∘ Samples with a length of 10 cm, a width of 10 cm and an original material thickness ∘ 50 ∘ C + / − 5 ∘ C ∘ thermophilic conditions according to ISO 16929, ∘ Sieving out the solids after six months in a sieve with a mesh size of 2 mm (mesh 8.75) less than 80 % by weight, in particular less than 50 % by weight, less than 25 % by weight or less than 10 % by weight of the dry mass of the starting material remains in the sieve during sieving, or ∘ Samples with a length of 10 cm, a width of 10 cm and an original material thickness ∘ 50 ∘ C + / − 5 ∘ C ∘ thermophilic conditions according to ISO 16929, ∘ Sieving out the solids after six months in a sieve with a mesh size of 2 mm (mesh 8.75) - in a marine incubation test, with the following parameters: ∘ Samples with a length of 2 cm, a width of 2 cm and an original material thickness ∘ 30 ∘ C + / − 2 ∘ C ∘ aerobic conditions in seawater with a salt content of 3.5 wt.% +/- 1 wt.%, ∘ Sieving out the solids after 4, 8 and 12 weeks in a sieve with a mesh size of 2 mm (mesh 8.75) ∘ Samples with a length of 2 cm, a width of 2 cm and an original material thickness ∘ 30 ∘ C + / − 2 ∘ C ∘ aerobic conditions in seawater with a salt content of 3.5 wt.% +/- 1 wt.%, ∘ Sieving out the solids after 4, 8 and 12 weeks in a sieve with a mesh size of 2 mm (mesh 8.75) less than 80 % by weight, in particular less than 50 % by weight, less than 25 % by weight or less than 10 % by weight of the dry mass of the starting material remains in the sieve after 12 weeks, and the second structural material has a second biodegradability which is different from the first biodegradability, in particular is lower than the first biodegradability and in that the first structural material is arranged in the geomaterial web in such a way that, after partial or complete biodegradation of the first structural material, openings are formed in the geomaterial web passing through the geomaterial web,