Action de démanteler et détruire un obstacle à la continuité écologique (biologique et sédimentaire) d’un cours d’eau. Par exemple un seuil ou un barrage, édifié sur les cours d’eau.
It refers to the method used for determining the rank of a watercourse, a method commonly chosen because it is simple to implement. In this method, two sections of the same order which join form a higher order section, while a segment that receives a lower order segment keeps the same order.
In the context of public works: development of a slope at the foot of an hydraulic structure to protect it.
In the context of flood risk reduction: development that consists of a medium-full bed in order to increase the capacity of a watercourse and to reduce water levels during flooding.
A species that is indigenous or non-native to a given territory, proliferates and extends its range due to an increase in population density.
Refers to fish that migrate from river waters to the sea or vice versa, once or several times during their lifetime. We can distinguish anadromous species that migrate up rivers to reproduce and catadromous species that most often live in fresh water and will reproduce at sea.
Gradual reduction of the water flow, until available resources are exhausted.
Fragmentation of a watercourse into several fragments, due to natural or artificial obstacles (i.e. sills, dams, weirs, etc), which may lead to a disruption into the ecological continuity, preventing the free movement of species or the smooth sediments flow.