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PORTAIL D'INFORMATION GÉOGRAPHIQUE

Résultats de la recherche (13 résultats)

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Par Collection Par Auteur Par Date Par Sujet Par Titre
  • Changes of emergent aquatic macrophyte cover in seven large boreal lakes in Finland with special reference to water level regulation
  • Eutrophisation ; Finlande ; Lac ; Niveau lacustre ; Photo-interprétation ; Photographie aérienne ; Siècle 20 ; Végétation aquatique
  • of the surrounding soils to the cover of emergent aquatic vegetation.
  • Black and white aerial photographs from 1947-1963 and colour, mainly infrared aerial photographs from 1996-2000 were used to study quantitative vegetation changes in 7 large lakes : Kemijärvi, Unnukka, Kallavesi, Päijänne, Näsijärvi, Pyhäjärvi
  • and Vanajavesi. Vegetation changes were evaluated by comparing the situation before large-scale water level regulation and eutrophication to the current situation. The results point out the crucial impact of changing water levels and the significance
  • 2005
  • Aquatic ecosystem ; Biogenic process ; Biological indicator ; Caucasus ; Ecology ; European part of Russia ; Hydrochemistry ; Lake ; Mountain ; Phytoplankton ; Water quality
  • 2005
  • on an urban aquatic ecosystem. On average, the surveyed 209.4 km of river lengths are heavily disturbed due to man-made influences. However, even in a heavily populated city like Berlin spots of undisturbed or only slightly disturbed nature still persists
  • 2005
  • Aquatic ecosystem ; Aragón ; Arid area ; Desert ; Humid environment ; Playa ; Remote sensing ; Salinity ; Spain ; Typology
  • 2005
  • Aquatic ecosystem ; Asian part of Russia ; Hydrocarbon ; Lacustrine sediment ; Oil product ; Pollution ; Stream ; Tyumen
  • 2005
  • Aquatic ecosystem ; Marine ecosystem ; Mollusca ; Theory ; Water ; Water purification ; Water quality
  • 2005
  • Information System analysis to examine the planform channel response of the upper Colorado River delta (limitrophe reach) to this recently altered hydrology. It provides insight into how floods affect the channel system that provides the foundation for aquatic
  • 2005
  • Aquatic ecosystem ; California ; Dam ; Environmental management ; Fish breeding ; Gold ; Mining activity ; Sierra Nevada ; United States of America ; Water quality ; Watershed
  • 2005
  • Aquatic ecosystem ; Dam ; Fish breeding ; Hydraulic works ; Sedimentation ; Stream ; United States of America ; Washington State ; Water quality
  • 2005
  • Aquatic ecosystem ; Ecosystem ; Fish ; Habitat ; Image ; Image processing ; Sand ; Stream ; Water quality
  • 2005
  • Aquatic ecosystem ; Ecology ; Flood ; Habitat ; Human impact ; Hydrological regime ; Methodology ; Risk ; Stream ; Stream flow ; Water quality
  • 2005
  • Aquatic ecosystem ; Carbonate ; Dammed lake ; Ecology ; European part of Russia ; Eutrophication ; Lake ; Moscow ; Water stratification
  • 2005
  • Aquatic ecosystem ; Armenia ; Environmental conservation ; Environmental management ; Geopolitics ; Hydro-electric station ; International aid ; Irrigation ; Lake ; Lake level ; Regional planning ; Sevan ; Water resources
  • 2005