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Portail d'information géographique

Résultats de la recherche (46 résultats)

LiDAR remote sensing of forest structure

. Direct retrieval of canopy height provides opportunities to model above-ground biomass and canopy volume. Access to the vertical nature of forest ecosystems also offers new opportunities for enhanced forest monitoring, management and planning.
2003

Dynamika zmian dobowych i zroznicowanie przestrzenne temperatury powietrza na Hali Gasienicowej

This paper adresses the matter of the differentiation of thermal conditions in the near ground air layer at Hala Gaşienicowa, as well as their relationships with plant cover, shape of relief and exposure to the sun. Mean daily air temperature
2003

First order gravity network of Belgium

Belgium ; Data processing ; Fitting ; Geodesy ; Gravimetry ; Ground survey ; Observation network
2003

Reinterpretation of the original Dekalb mounds in Illinois

remnants, presumably due to the degradation of significant ground ice and permafrost. In this study, the DeKalb mounds are presumed to have developed from an intricate set of glacial dead-ice and mass movement processes. This reinterpretation reflects
2003

Meteorological observations 2002 at the Arctic Station, Qeqertarsuaq (69°15'N), Central West Greenland

This paper summarises meteorological parameters during 2002, including snow cover, ground temperatures and active layer development, and air temperatures at the station during 1991-2002 are compare to large scale trends during the last century.
2003

Conditions bioclimatiques des chambres souterraines de traitement curatif dans les mines de sel en Pologne

The paper presents the results of bioclimatic research carried out in the salt mine in Wieliczka in the vicinity of Cracow. On the two levels (221 and 260 m under the ground) we have measured air temperature and humidity, air pressure
2003

Analyse micro-climatologique des variations du vent en fonction des températures au Spitsberg

Arctic Region ; Atmospheric circulation ; Climate ; Ground survey ; Microclimate ; Spitsbergen ; Svalbard ; Temperature ; Weather type ; Wind
2003

Infiltration rate assessment of some major soils

Drainage ; Ground survey ; Infiltration ; Ireland ; Irrigation ; Rill wash ; Risk ; Seasonal variation ; Soil ; Soil properties
2003

Hydrogéologie du bassin du fleuve Congo : approche des échanges hydriques surface/souterrain en milieu continu

Congo ; Fluvial water ; Groundwater ; Hydrogeology ; Model ; Phreatic ground water ; Water exchange ; Watershed
2003

Umiujaq, northern Québec : innovative techniques to monitor the decay of a lithalsa in response to climate change

Canada ; Climatic variation ; Cold area ; Geophysics ; Ground survey ; Ice ; Palsa ; Periglacial features ; Permafrost ; Quebec ; Radar
2003

Snow cover and soil moisture controls on solifluction in an area of seasonal frost, eastern Alps

meter and time-domain-reflectometry (TDR) probes to measure the unfrozen water content of the soil. Three phases of ground thermal and hydrological conditions were identified, each with distinct consequences for soil movements.
2003

Evidence for Late-Pleistocene permafrost in the New Jersey Pine Barrens (latitude 39°N), eastern USA

and abrasion. Optically-stimulated-luminescence dating of infill material indicates that thermal-contraction-cracking and emplacement of the sand infill must have occurred during 2 separate periods during the Late Pleistocene. The presence of soil (ground
2003

Dissolved organic carbon fluxes in a discontinuous permafrost subarctic alpine catchment

to the stream during spring freshet and summer rainfall events, evaluates what roles permafrost and frozen ground play in DOC flushing, and provides a first-order estimate of annual DOC export.
2003

Impact of the timing and duration of seasonal snow cover on the active layer and permafrost in the Alaskan Arctic

at Barrow, Alaska, were used as baseline inputs. The active layer thickness in 1998 and the ground temperatures at depths of 0.0, 0.5, 1.0, and 2.0 m during September 1997 through August 1998 were simulated. A series of simulation cases was conducted
2003

Sediment flux and compaction trends on off-road vehicle (ORV) and other trails in an Appalachian forest setting

This research investigates the impact of off-road vehicles (ORVs) on sediment dynamics and compaction in the forested hillslope terrain of southeastern Ohio. A dense network of ground-height change, penetrometer resistance, and penetrometer depth
2003

New geomorphological indicators of a former tibetan ice sheet in the central and northeastern part of the high plateau

China ; Geomorphology ; Glacial valley ; Glacier ; Grain size distribution ; Ground moraine ; High mountain ; Ice sheet ; Periglacial geomorphology ; Petrography ; Prehistory ; Tibet
2003

Role of epiphreatic flow and soutirages in conduit morphogenesis : the Bärenschacht example (BE, Switzerland)

Bern ; Cave development ; Hydrogeology ; Karst ; Model ; Phreatic ground water ; Switzerland ; Underground flow
2003

Couches de glace dans les sédiments marins du Pléistocène du Subarctique russe

Arctic Region ; Ground ice ; Ice ; Marine sediment ; Northern Russia ; Palaeogeography ; Pleistocene ; Russia ; Sea ice
2003

Aeolian destabilization along the Mojave River, Mojave Desert, California : linkages among fluvial, groundwater, and aeolian systems

and geologic conditions, vegetation, and human interactions. This study uses ground observations, aerial and orbital imagery, and historical documentation to trace short-term changes to the dune environment. The results demonstrate the sensitivity of aeolian
2003

Riposta sismica dell'area urbana di Rieti in occasione del terremoto del 27 giugno 1898 nel bacino di Vazia (Ri)

of damage in cities is hardly homogeneous, being affected by the quality and conditions of buildings, the geological characteristics of the ground they are built on, and the morphological features of the area where the city is located. - (NF)
2003