Wire mesh cage to be filled with stones and pebbles for the protection of engineering structures or river banks.
Glossaire de A à Z
Induced change in the dynamics of the biosphere by human activities, directly or not.
For a natural habitat, sum of the influences acting on a natural habitat and typical species that may affect its long-term natural distribution, structure and functions as well as the long-term survival of its typical species within the territory. For species, sum of the influences acting on the species concerned that may affect the long-term distribution and abundance of its populations within the territory.
Grass strip bordering a plot, mainly located along rivers, which acts as a buffer zone by intercepting and filtering runoff water.
Chlorophyllous aquatic plant having no leaves, no roots, no vessels, no flowers, no seeds, whose main photosynthetic pigments are chlorophylls a and b. As the name suggests, they are usually green in color.
Algae phylum whose sometimes exclusive major pigment is chlorophyll β, associated with carotene and xanthophyll. Their only reproductive organs are sporocysts and gametocysts. Their plastids elaborate starch as in the Phanerogamous. It includes three classes: Chlorophyceae, Zygophyceae and Charophyceae.
Domestic waste water from showers, baths, sinks and sinks, washing machines and dishwashers.
According to the hydro-geological meaning, a water volume supplying an aquifer over a given time. Rainfalls are mainly recharging groundwater. Unconfined groundwaters are recharged rather fast at each rainfall event. The rise in water levels and rainfall events are observed on a piezometric curve.
Water contained in a permeable portion of the completely soaked earth's crust, resulting from infiltration of water into the smaller interstices of the sub-soil and from its accumulation over an impermeable layer. Groundwater sheets form true underground rivers only in karstic grounds. Groundwater corresponding to water infiltrated into the soil is flowing through permeable rocks in the sub-soil and forms "reserves". Different types of groundwater sheets are distinguished according to various criteria which may be: geological (alluvial sheets - shallow porous media, sheets in fractured medium - carbonated or eruptive, sheets in karstic - carbonated soil, sheets in porous media - sandstone, sand) or hydrodynamic (alluvial sheets,