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Portail d'information géographique

Résultats de la recherche (15 résultats)

Strontium isotope ratios in streams and the effect of flow rate in relation to weathering in catchments

To provide more detail information on the effect of flow rate on strontium isotope ratios, the Sr 87/Sr 86 ratio was measured in streamwater samples taken at low and high flow rates and also in samples taken at four and eight hourly intervals during
1998

Changing a decision taken under uncertainty : the case of the criminal's location choice

Changing a decision taken under uncertainty : the case of the criminal's location choice
1998

The private provision of urban infrastructure : financial intermediation through long-term contracts

study of Australian infrastructure investment performance. The steps taken in evaluating urban projects are analysed in a formal manner. A commonly desired form of financial intermediation is a formal contract binding the parties to one another over
1998

Az Észak-magyarországi-középhegység ásványi nyersanyagai és bányászata

. The extraction of non-metallic minerals of the North Hungarian Mountains has recently come to the fore. The quarrying of building materials has been declining since 1990 and most of the companies were taken over by foreign investors, similar to other mines. - (ZK)
1998

Old versus New - timber analysis of Acre and Haifa in nineteenth-century Palestine

Botanical identification of construction timbers is used to suggest different historio-geographical developments of two nearby Palestinian port cities, Haifa and Acre. Fragments of wood samples were taken from every wooden element of seventy
1998

Effects of a pebble cluster on the turbulent structure of a depth-limited flow in a gravel-bed river

This paper presents original results from measurements of velocity taken at a high spatial and temporal resolution in a turbulent flow upstream and downstream from a pebble cluster. The high sampling resolutions in a natural environment permitted
1998

Spatial and short-term temporal variations in runoff, soil aggregation and other soil properties along a mediterranean climatological gradient

climatological and altitudinal gradient in terms of lithology, soils and vegetation was selected in the province of Alicante. Some variables were taken as indicators (runoff, soil moisture, aggregate distribution and stability) of different processes
1998

Numerical analysis of coastal cliff failure along the Pembrokeshire Coast National Park, Wales, UK

, wave climates and containing abundant and representative failure types for the broad geological divisions of this environment. 4 sites were selected and intensively studied. Measurements were taken in the field and laboratory of geological
1998

Extreme event in the last 200 years in the Upper Vistula Basin : their palaeohydrological implications

To provide characteristics of present-day extreme events which may serve as a key to better recognition of past hydrological changes, the upper Vistula basin was taken as an example. The observations are mainly related to last 100-150 years
1998

Subterrane Erosion im östlichen Harzvorland

This study examines, in the eastern Harz Foreland, the initiation and evolution of forms caused by subsurface erosion using aerial photographs taken between 1964 and 1993. The subsurface erosion processes occur in a Pleistocene depression filled
1998

Land-use changes in two middle hills districts of Nepal

period to foster community forestry. Study used sets of air photographs taken in 1978 and 1992, supplemented by Rapid Rural Appraisal and other information, to assess land-use changes from 600 to 4,000 m in altitude. Whereas some grassland and shrublands
1998

On standardizing the water drop penetration timeand the molarity of an ethanol droplet techniques to classify soil hydrophobicity : a case study using medium textured soils

This study uses sandy loam soils comprising a broad range in particle size and degree of hydrophobicity to 1) assess how well measurements taken on air-dried and sieved laboratory samples reflect the hydrophobicity of an undisturbed, dry in situ
1998

Sensitivity of bed shear stress estimated from vertical velocity profiles : the problem of sampling resolution

taken in a stream with mixed sand and gravel bed.
1998

Processus géodynamiques et cartographie des mouvements de terrain dans la région de Chaouène : application à la confortation de la route principale N°39 Rif occidental, Maroc

. Geomorphological information was taken from a morphostructural and morphodynamic map at a scale of 1/20.000. The construction of a DEM in addition to further thematical map products allowed to process further morphometric GIS analysis of the region by using the GIS
1998

Die Entwicklung der Nehrung Fischland-Darss-Zingst und ihres Umlandes seit der Litorina-Transgression und die Rekonstruktion ihrer subrezenten Dynamik mittels historischer Karten

The development of the Fischland-Darss-Zingst spit was reconstructed for different times after the beginning of the Litorina transgression. Especially the processes of an accelerated straightening of the coast is taken into account
1998