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.
Area of the subsoil in which the water completely occupies the interstices of the rock (aquifer) and is likely to move laterally under the effect of gravity and pressure gradients.
All of the water contained in a permeable fraction of the earth's crust which is completely soaked, as a result of the infiltration of water into the smallest interstices of the basement and its accumulation above an impermeable layer. Groundwater tables only form underground rivers in karstic areas. Groundwater corresponding to water infiltrated into the ground, circulating in the permeable rocks of the subsoil, form "reserves". Different types of aquifers are distinguished according to various criteria which can be: geological (alluvial aquifers - superficial porous media, aquifers in cracked environment - carbonate or eruptive, aquifers in karst environment - carbonate, aquifers in porous environment - sandstone, sand) or hydrodynamic ( alluvial aquifers, free aquifers, or captive aquifers The same aquifer may have a free part and a captive part.