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ZONA DEGRADACION [2 records]

Filter results by subject field Alphabetical list of terms

Filter results by subject field

Alphabetical list of terms

Record 1 2012-07-19

English

Subject field(s)
  • Environmental Management
DEF

A specific area ... where degraded environmental conditions have created an impairment to human or ecological use of the water body.

OBS

area of concern: term usually used in the plural (areas of concern).

OBS

Compare with "hot spot."

Key term(s)
  • areas of concern

French

Domaine(s)
  • Gestion environnementale
DEF

Secteur précis [...] où la détérioration de l'environnement a fini par nuire à l'utilisation humaine ou écologique des plans d'eau.

OBS

secteur préoccupant : terme relevé dans le rapport du Conseil de la qualité de l'eau, Commission mixte internationale.

OBS

zones critiques; secteurs de préoccupation : termes relevés dans l'Accord Canada-États-Unis relatif à la qualité de l'eau dans les Grands Lacs.

OBS

secteur préoccupant; secteur de préoccupation; zone critique : termes habituellement utilisés au pluriel (secteurs préoccupants; secteurs de préoccupation; zones critiques).

OBS

Les points névralgiques (en anglais : «hot spots») sont un bon exemple de secteur préoccupant.

Key term(s)
  • secteurs préoccupants
  • secteurs de préoccupation
  • zones critiques

Spanish

Campo(s) temático(s)
  • Gestión del medio ambiente
DEF

Zona que presenta grados severos de degradación de la tierra, en la que la autoridad, mediante declaratoria, establece un régimen especial de utilización y manejo de las tierras.

Save record 1

Record 2 2001-03-05

English

Subject field(s)
  • Water Pollution
  • Water Treatment (Water Supply)
CONT

Zones of Water Pollution. Discharge or mixing zone is where pollutants enter the stream or the river. If the waste is dark, it will make the water dark, increase its temperature and subsequently oxygen levels will drop. The rate of discharge should not be stronger than flow of the stream. In zone of degradation oxygen levels drop from BOD (biological/biochemical oxygen demand). Zone of active decomposition is characterized by the following changes: 1) dissolved oxygen (DO) will be at its absolute minimum; 2) odors and gases bubbling up. In the zone of recovery the river will slowly restore its oxygen through aeration process. The anaerobic conditions will disappear. Nitrites will be converted into nitrates and stimulate growth of algae, which will produce oxygen through process of photosynthesis. In zone of clean water oxygen levels are really elevated. And BOD is almost satisfied.

French

Domaine(s)
  • Pollution de l'eau
  • Traitement des eaux
DEF

Zone située en aval d'un rejet d'eaux usées dans laquelle s'effectue la première phase de dégradation de la matière organique.

Spanish

Campo(s) temático(s)
  • Contaminación del agua
  • Tratamiento del agua
DEF

Primera zona del proceso de autopurificación de un efluente contaminado. Se caracteriza por la presencia de materias contaminantes flotantes. Su contenido de oxígeno disminuye pero no se agota inmediatamente.

Save record 2

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