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Portail d'information géographique

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Geomorphology's role in the study of weathering of cultural stone
  • Geomorphology's role in the study of weathering of cultural stone
  • Cultural stone weathering studies demonstrate the importance of biotic and saline weathering agents and the significance of weathering factors such as exposure (microclimate) and human impact. More sophisticated methods confirm these observations
  • , but also reveal discrepancies between field and laboratory studies. More sophisticated methods confirm these observations, but also reveal discrepancies between field and laboratory studies. In any event, cultural stone weahering studies have been
  • 2002
Wetland diagenesis and traces of early hominids, Olduvai Gorge, Tanzania
  • The purpose of this study was to characterize geochemical variability in the basal LMBII deposits and thereby identify freshwater settings within the otherwise saline and alkaline Eastern Lacustrine Plain. Data on stone artifact and fossil bone
  • freshwater sources produced an associated focus of stone tool discard and loss.
  • 2002
Investigations on spatial heterogeneity of humus forms and natural regeneration of larch (Larix decidua Mill.) and swiss stone pine (Pinus cembra L.) in an alpine timberline ecotone (Upper Engadine, Central Alps, Switzerland).
  • Investigations on spatial heterogeneity of humus forms and natural regeneration of larch (Larix decidua Mill.) and swiss stone pine (Pinus cembra L.) in an alpine timberline ecotone (Upper Engadine, Central Alps, Switzerland).
  • 2002
Glacial and periglacial phenomena in Ethiopia : a review
  • host a few localized large relict cryogenic landforms (e.g. stone stripes), suggesting past sporadic permafrost. A variety of regional factors may have contributed to the more extensive periglacial activity in southern Ethiopia than in the higher Simen
  • 2002
Simulation of individual particle movement in a gravel streambed
  • . Resistance fields, particle dropping and critical elevation rules control particle interactions. The interaction rules cause the particles to develop pebble clusters, stone cells and transverse structures. The simulated travel distances of individual
  • 2002
Recent research on the nature, origin and climatic relations of blocky and stratified slope deposits
  • Aeolian transport ; Bibliography ; Mass movement ; Mudflow ; Palaeo-environment ; Palaeoclimatology ; Periglacial features ; Slope ; Slope deposit ; Slope dynamics ; Stone river
  • 2002
Les cuirasses latéritiques et autres formations ferrugineuses tropicales. Exemple du Haut Katanga méridional
  • envisage successivement : 1) une présentation générale de la région étudiée, du relief et des profils présentant des formations ferrugineuses ; 2) l'horizon bariolé ; 3) la stone-line ferrugineuse et l'horizon superficiel ; 4) les cuirasses et leur
  • 2002
Volumetric displacement of flow depth by obstacles, and the determination of friction factors in shallow overland flows
  • Large roughness elements such as stones or plant stems (obstacles) influence the depth of overland flows in 2 ways. The first effect is a dynamic one, involving frictional retardation of the flow and associated reduction in flow speeds. The second
  • 2002