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Portail d'information géographique

Résultats de la recherche (19 résultats)

Routes and roots of geographical realities : identity as catalyst

The paper focuses on preserving the identity of geography as the discipline to understand everyday life. Routes taken in research and teaching are based on the discipline's historical roots, its perspectives, philisophy and methodology. Particular
1999

Mineral micro- and nano-variability revealed by combined micromorphology and in situ submicroscopy

The examples, taken in weathered andesitic pyroclasts occurring in the northern and northeastern part of the island of Basse Terre (Guadeloupe), studied here highlight the occurrence of different clay minerals and their spatial variability both
1999

Geography as landscape ecology

The tradition of geography as human ecology introduced to Danish geography by Sofus Christiansen is taken as a departure for an evaluation of present endeavour to promote geography as landscape ecology. The modest role in human ecology of human
1999

Efficiency and equity effects of market access on agricultural productivity : the case of small farmers in Machakos District, Kenya

The paper primarily investigates the extent to which market access affects the use of material and service inputs ; and how these in turn affect agricultural productivity. A further step is taken to compare small and large farmers in terms
1999

The geomorphic evolution of slopes and sediment chutes on forereefs

Frequentslope failures of the forereef dropoff occur in living coral reefs on the island of Bonaire in the southern Caribbean. Topographic profiles of 10 sites were taken perpendicular to shore, followed by an estimation of coral ages along
1999

Assessment of soil losses by ephemeral gully erosion using high-altitude (stereo) aerial photographs

. Ephemeral gullies formed within an area of 218 ha were mapped and measured both in the field and by high-altitude aerial photos taken at the same time. Comparison of these 2 methods shows that if only one of the 2 surveying techniques had been used, only 75
1999

Optical depth, size distribution and flux of dust from Owens Lake, California

Projects LODE (Lake Owens Dust Experiments) took place on the anthropogenically desertified playa and surrounding regions of Owens Lake, in east-central California. Optical depth measurements were taken and aerosol samples were obtained during dust
1999

Cyclic erosional instability of sandbars along the Colorado River, Grand Canyon, Arizona

. This research uses oblique photographs taken daily, automatically. Digital immage-processing techniques created planimetric models of sandbar area from the photos for the period March 1993 - May 1995. This technique allowed daily tracking of sandbar areas
1999

The pollen record of human influence at Paanajärvi

Cores of the uppermost laminated sediment were taken from 3 locations along Lake Paanajärvi, for fine-scale pollen study. The pollen diagrams can be correlated with the written history of the area. The wars and peace treaties that affected
1999

Fruizione delle risorse naturali e sistemi informativi territoriali. Un esempio applicato al Parco Nazionale del Pollino

The invasion risk, and related environmental degradation, by a kind of consumistic tourism in a protected area is taken into account. For the presence/absence of the tourists, main factors are the presence of grasslands, the distance from the roads
1999

Het verband tussen de geometrie van de getijdenduinen en de kenmerken van het bodemsediment in de maritieme Schelde

In 2 study areas in the maritime part of the Scheldt estuary, grab samples were taken and side-scan sonar recordings were carried out. Within the study areas, the strong variation in both the geometry of the subaqueous dunes and the sedimentological
1999

A 5000-yr record of climate change in varved sediments from the oxygen minimum zone off Pakistan, Northeastern Arabian Sea

The upper Holocene marine section from a kasten core taken from the oxygen minimum zone off Karachi (Pakistan) at water depth 700 m contains continuously laminated sediments with a sedimentation rate of 1.2 mm/yr and a unique record of monsoonal
1999

Evidence of lower-atmospheric ozone sloshing in an urbanized valley

concentrations and the associated atmospheric flow patterns were examined on three spatial scales for a two-month period during summer 1998. The synoptic-scale weather pattern provided a calm, clear background atmosphere. Taken together, the upslope and downslope
1999

Recent landscape history in arid western New South Wales, Australia : a model for regional change

Accelerated erosion by wind and water has taken place in arid western New South Wales since the introduction of domestic and feral herbivores by Europeans in the nineteenth century. This action led to widespread soil loss by sheetwash, rilling
1999

Estimating mean flow velocity in channel and floodplain areas and its use for esplaining the pattern of overbank deposition and floodplain retention

A method was developed which permits estimation of the mean flow velocity in the channel and floodplain zones at a given total discharge taken from a rating curve. The purpose of this paper is to demonstrate its utility for explaining
1999

Decades of change : contributions of geomorphology to fluvial and coastal engineering and management

Major developments in the contribution of geomorphology to engineering and environmental management have taken place over the past ten years in the United Kingdom, particularly in the coastal and fluvial spheres. This paper is not focused
1999

A view on some hydrological triggering systems in landslides

the presence of a permeable top layer and fissures has to be taken into consideration.
1999

Analysis of the institutional and social responses to the eruption and the lahars of Mount Pinatubo volcano from 1991 to 1998 (Central Luzon, Philippines)

Based on 3 viewpoints : from population, media and other actors, this analysis attempts to point out the strengths and weaknesses of the official management system, especially by studying the efficiency and the range of the solutions taken. So
1999

Die Bevölkerung in den Regionen der Bundesrepublik Deutschland. Eine Prognose des BBR bis zum Jahr 2015.

of incorporated data, some technical changes were made in the prognosis model. Furthermore the new spatial reference takes account of the reform of administrative areas which has taken place in the new federal states (Länder) in the meantime. - (MT)
1999