[Vegetation techniques for the river bank protection against erosion: an assistance to impact suppression]
1992
Lachat, B. (Biotec Biologie Appliquee, Vicques (Suisse))
The impact study must contribute to environmental protection by assessing the possible damage which the projects might cause. Although it is necessary to be able to point out the possible related impacts, it is just as important to be able to provide solutions which may constitute vital protective measures regarding reduction, elimination or counter-balancing of these attacks on the environment, should this be possible and depending on the type of projects involved. The author limits his considerations to technical solutions, which are grounded on hydro-ecological criteria, to solve problems encountered during river-bed channeling or other types of improvement works to watercourses and which are mainly carried out to fight river-bank erosion. The information provided ought to make watercourse improvements less environmentally aggressive than at present and ought also to lead to the adoption of solutions which circumvent known negative impacts, whilst solving a number of technical and ecological problems. The general principles regarding watercourse improvements are listed, together with those relating to planting techniques available to managers in their fight against erosion. In as far as it is sometimes necessary to correct a riverbed, planting techniques offer a number of advantages compared with the more traditional civil engineering techniques. One has only to look at their very high resistance values to tearing away from their planting sites (values given in table-form). Examples, in the form of photographic follow-up, clearly show the effectiveness and ecological interest provided by these bioengineering methods.
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