Changes in the hydrology and sediment transport produced by large dams on the lower Ebro river and its estuary
The aim of this paper is to analyse the changes in the hydrology and sediment transport in the lower Ebro river and its estuary as a consequence of dam construction and increased water uses in the basin. Changes at different time-scales
are specifically considered : long-term changes (years to decades), seasonal changes and daily changes. A critical analysis of the existing data on sediment transport in the present century is also presented.
China ; Climatic warming ; Forecast ; Global change ; Impact ; Model ; Precipitation ; Sea level ; Tourism ; Tropical cyclone
Model simulations and paleoclimatic data studies show an evident change in temperature and precipitation over China will occur under conditions of the global warming. Possible scenarios of the future climates are given here for China on the basis
of synthesizing model simulations and paleoclimatic data. Most parts of China will experience an increase in temperature, but the warming may be more remarkable in winter in the northern half of the country. Some regions will benefit from the climate change
Argentina ; Atmospheric circulation ; Climatic variation ; Ecosystem ; Global change ; Model ; Palaeoclimatology ; Palynology ; Pampa ; Pollen diagram ; Quaternary
This study reconstructs past plant communities in the pampa grassland for the late Quaternary, to infer regional paleoclimatic trends, and to relate these trends to global changes in atmospheric circulation. Several dated pollen records were anlyzed
and interpreted using modern pollen spectra. The comparison of fossil pollen sequences with modern pollen provided information about changes in the composition and distribution of late Quaternary vegetation.
This review of the recent scientific literature on climate change focuses on one aspect of the issue which has come to the fore over the last three years, the role of atmospheric aerosols in contemporary cimate change. The emergence
of these particulates as a significant modifier of the atmospheric and climatic environment has, at the same time, offered new opportunities for detecting human-induced climate change in the observed record and also complicated the prediction of future climate change
Les changements de l'environnement naturel et social dans quatre quartiers de référence à Budapest du 18e s. à nos jours
Budapest ; Changement social ; Changement urbain ; Environnement urbain ; Géographie urbaine ; Hongrie ; Quartier ; Société urbaine ; Ville
Budapest ; Hungary ; Social change ; Town ; Urban change ; Urban district ; Urban environment ; Urban geography ; Urban society
Paper deals with the changes of the natural and social environment of four sample areas in Budapest from the 18th century until today. Authors use historical maps in order to reconstruct the development stages, territorial expansion and land use
The level of the ocean changes with time by a number of different causes. The rates and amplitudes of these changes differ. During the last 5000 years, the eustatic changes have been dominated by the redistribution of water masses due to changes
in the oceanic circulation systems. The sea-level changes to be expected in the next century are estimated on the basis of past and present sea-level changes and their driving forces; a possible future sea level rise in the next century will, at the most
Climate change can also be observed in the countries of South-Eastern Central Europe. Author investigates the physical geographical factors which reflect the present climate change in Hungary. According to the author an aridification process can
be observed in Hungary and its surrounding as an effect of climate change. Changing precipitation, vegetation and soil profiles of the country are investigated. - (JS)
Changing characteristics of public housing residents
This paper aims to examine the change in characteristics of residents in public housing and to clarify the cause of this transformation process. - (KA)
Recent theorisation in rural studies provides insights that assist interpretation of change in the Tasmanian dairy industry. Factors contributing to change include growth of foreign ownership of dairy properties and manufacturing plant. The changes
Catastrophic implications of global climatic change in the cold regions of Eurasia
Arctique ; Catastrophe ; Changement global ; Eau de fonte ; Effet de serre ; Eurasie ; Iakout-Sakha ; Kola presqu'île ; Pergélisol ; Russie ; Réchauffement climatique ; Sibir' Zapadnaâ ; Thermokarst ; Variation climatique ; Zone froide
Arctic Region ; Catastrophe ; Climatic variation ; Climatic warming ; Cold area ; Eurasia ; Global change ; Greenhouse effect ; Kola Peninsula ; Meltwater ; Permafrost ; Russia ; Sakha ; Thermokarst ; West Siberia
Some models predict that annual air temperatures in the Eurasian cold regions could increase by 3 to 6°C in the years 2020 to 2030. In this paper the A. tries to evaluate the probable catastrophic implications of global climatic change in the cold
Major floods cause channel changes ranging from complete cross-sectional change to small fluctuations in pool area. The AA. used stream cross-section data on 30 heavily grazed rangeland streams in north-central Nevada to assess changes over
a climatically variable 14-year period. They tested (Rosgen, 1994) assertion that stream-type changes are predictable and more common on certain types of streams. On streams that did not change type, the AA. assessed the magnitude of habitat changes and whether
these changes are predictable based on stream type.
Global change and environmental issues: research and pedagogy
Changement global ; Couverture végétale ; Cycle de l'eau ; Dynamique des populations ; Eau potable ; Environnement ; Gestion des ressources ; Pédagogie ; Qualité de l'eau ; Relation homme-environnement ; Utilisation du sol
Drinking water ; Environment ; Global change ; Land use ; Man-environment relations ; Pedagogy ; Plant cover ; Population dynamics ; Resource management ; Water cycle ; Water quality
Les changements dans l'utilisation du sol et la couverture végétale: de nouveaux défis pour les géographes. Un module d'application partiel sur les changements globaux et régionaux en matière d'utilisation du sol et de couverture végétale
: évaluation des données et recherche de relations générales. L'homme et le cycle de l'eau: défis pour le 21e siècle. Thèmes sociaux relatifs à l'eau. Dynamique des populations et changement global: besoins de nouveaux schémas conceptuels et exercices pour les
Urban change and environment in the North-Western Mediterranean
Changement urbain ; Domaine méditerranéen ; Développement urbain ; Environnement urbain ; Espagne ; France ; Italie ; Planification urbaine ; Structure socio-économique ; Trafic urbain ; Utilisation du sol ; Ville
France ; Italy ; Land use ; Mediterranean area ; Socio-economic system ; Spain ; Town ; Urban change ; Urban development ; Urban environment ; Urban planning ; Urban traffic
Urban change is the result of some very complex socio-economic processes and spatial dynamics. Such transformations can be studied on various geographical scales in Spanish provincias, French départements and the Italian provinces around
the mediterranean sea (latin arc). Relations between urban change and environmental impact, recent change in land use, and environmental effects of urban traffic are studied. Urban growth has a disharmonious character compared to the demographic evolution
Quantitative estimates of the effect of climate change on dust storm activity in Australia during the Last Glacial Maximum
Special Issue. Response of aeolian processes to global change
Australie ; Changement global ; Eolien ; Quaternaire ; Tardiglaciaire ; Tempête de poussière ; Transport éolien ; Variation climatique ; Variation spatiale
Aeolian features ; Aeolian transport ; Australia ; Climatic variation ; Dust storm ; Global change ; Lateglacial ; Quaternary ; Spatial variation
Quantitative estimates are made of the effect of climate change upon dust activity during the Last Glacial Maximum (LGM), which peaked 18,000 years ago, using present-day measurements of the occurence of dust storms recalculated in the light
of information on LGM climatic change. Dust storm seasons were lengthened and dust paths were modified. Estimates based upon climate alone, without considering the increased supplies of sediment to dust source areas during the LGM, however, probably underestimate
Social segregation, housing tenure and social change in Dutch cities in the late 1980s
This paper considers data from Britain and The Netherlands relating to changes in the housing sector and to social segregation and indicates that emerging patterns are very different. Socio-tenurial polarisation and social segregation
are not as marked in The Netherlands as in Britain and are not changing as fast. Concern with globalisation and common influences on change should be balanced with a recognition of the importance of other factors in determining the pattern and pace of change
La Société russe de géographie : idées et voies nouvelles. Rapport à la conférence internationale Changements globaux et géographie (Moscou, août 1995 g.)
Changement global ; Méthodologie ; Pratique de la géographie ; Recherche ; Russie ; Société de géographie
Global change ; Methodology ; Practice of geography ; Research ; Russia
Exposé d'une approche originale pour l'analyse des causes et des conséquences possibles de ce qu'on appelle les changements globaux de l'environnement, en particulier du réchauffement du climat, des diverses pollutions, de la montée du niveau des
océans, de la diminution de la biodiversité, ainsi que des questions du peuplement, des problèmes géopolitiques et autres. Les causes des changements visibles sont surtout naturelles, le rôle de l'action anthropique est moins important.
The suitability of montane ecotones as indicators of global climatic change
Changement global ; Ecologie ; Ecotone ; Forêt ; Forêt décidue ; Indice climatique ; Limite supérieure de la forêt ; Montagne ; Photosynthèse ; Réchauffement climatique ; Région polaire
Climatic index ; Climatic warming ; Deciduous forest ; Ecology ; Ecotone ; Forest ; Global change ; Mountain ; Photosynthesis ; Polar region ; Tree line
The AA. address the suitability of two montane ecotones, the alpine treeline ecotone and the deciduous/Boreal forest ecotone, as indicators of climate change. In so doing, they 1) briefly review the literature on the ecotone, focusing on the factors
Physical changes in the Mediterranean Basin (with particular reference to italy)
Action anthropique ; Changement global ; Circulation atmosphérique ; Déboisement ; Erosion des sols ; Géosystème ; Italie ; Karst ; Limite supérieure de la forêt ; Littoral ; Montagne ; Méditerranéens, pays ; Pergélisol ; Utilisation du sol
Atmospheric circulation ; Coastal environment ; Deforestation ; Geosystem ; Global change ; Human impact ; Italy ; Karst ; Land use ; Mediterranean States ; Mountain ; Permafrost ; Slope ; Soil erosion ; Tree line
This contribution is a preliminary sketch of some of the aspects and elements connected with the regional and global changes. It is intended to be an organised outline of both the main physical geographical aspects and of the man-environment
relationship in this peculiar region: the main characteristics of the Mediterranean basin; the climatic conditions; the human settlements and the land use; the mediterranean and the global changes; Italy as a case study; seas and coatal areas; plains and inner
Responses of interrill runoff and erosion rates to vegetation change in southern Arizona
Vegetation change, from grassland to shrubland, has occurred over much of the Sonoran and Chihuahuan Deserts during the past century. The effect of this vegetation change on interrill runoff and erosion was examined by conducting rainfall-simulation
experiments on large runoff plots on contemporary grassland and shrubland hillslopes. The environmental change that has led to the vegetation change has been relatively minor, but its geomorphic impact has been substantial.