Résultats de la recherche (994 résultats)
Affinez votre recherche
Par Collection Par Auteur- HELMING, K., (Editeur scientifique) (9)
- ARNAUD-FASSETTA, G., (Editeur scientifique) (6)
- Croatian Geographical Society, Zagreb, Croatie, (Commanditaire) (4)
- BARSCH, D., (Editeur scientifique) (3)
- HOYLER, M. (3)
- JAMES, L.A., (Directeur de publication) (3)
- KENNET, P., (Editeur scientifique) (3)
- MAUSBACHER, R., (Editeur scientifique) (3)
- MOSSA, J., (Directeur de publication) (3)
- POESEN, J. (3)
- PARKINSON, C.L. (3)
- STARKEL, L. (3)
- TAYLOR, P.J. (3)
- AUZET, A.-V. (2)
- AUZET, A.-V., (Editeur scientifique) (2)
- Association Amicale Internationale de Phytosociologie, International (2)
- Association Internationale pour l'Etude de la Vegetation, International (2)
- BRAZIER, R., (Editeur scientifique) (2)
- BUTLER, D.R. (2)
- CARRASCO, J.A., (Editeur scientifique) (2)
- 2014 (73)
- 2013 (66)
- 2009 (51)
- 2011 (49)
- 2012 (46)
- 2005 (42)
- 2008 (41)
- 2006 (40)
- 2010 (40)
- 2007 (39)
- 1988 (35)
- 1980 (32)
- 1999 (27)
- 1984 (26)
- 1993 (24)
- 1983 (23)
- 1995 (22)
- 2002 (20)
- 2004 (20)
- 1994 (19)
- Geography of Europe (107)
- Physical geography (55)
- Human geography (34)
- General points on geography (21)
- Geography of America (19)
- Geography of Asia (9)
- History of geography (8)
- Geography of Africa (5)
- Geography of Oceania (3)
- Geography of polar regions (3)
- Asie (2)
- Asie de l'Est (2)
- Chine (2)
- Espace urbain (2)
- (1541-1871) ; Démographie historique ; England ; Géographie de l'Europe ; Population ; Royaume-Uni ; Siècle XVI-XIX ; Technique de recherche (1)
- (1771-1954) ; Climatologie ; Crue ; Géographie de l'Europe ; Mesure ; Praha ; Précipitation ; Tchécoslovaquie ; Vltava, rivière (1)
- (1869-1970) ; Cesky ; Changement ; Géographie de l'Europe ; Hiérarchie urbaine ; Industrialisation ; Polarisation ; Tchécoslovaquie ; Ville (1)
- (1910-1980) ; Arkansas, valley ; Cours d'eau ; Développement régional ; Etats-Unis ; Géographie de l'Amérique ; Ohio valley ; Réseau ; Transport ; Transport fluvial ; Voie navigable (1)
- (1931-1960) ; Atmosphère ; Australie ; Climatologie ; Géographie physique ; Hémisphère Sud ; Monde ; Oscillation Australe ; Pression atmosphérique ; Précipitation ; Téléconnexion atmosphérique ; Variabilité interannuelle ; Variation saisonnière (1)
- (1949-1977) ; Analyse de régression multiple ; Atmosphère ; Bioclimatologie ; Bioclimatologie humaine ; France ; Géographie humaine ; Indicateur climatique ; Mortalité ; Méthodologie ; Population ; Température ; Variation interannuelle ; Variation saisonnière (1)
- Oceans connect (11)
- Soil erosion patterns : evolution, spatio-temporal dynamics and connectivity. Special issue (10)
- Special issue on Geoarchaeology : human-environment connectivity (6)
- Znanstveni skup Prometni sustav, ekonomsko-socijalni razvoj i orgnizacija prostora (Serbo-Croate (4)
- Changing fluvial systems (3)
- Cohesive neighbourhoods and connected citizens in contemporary European societies. Special issue (3)
- Geografija in prostor (3)
- Géographie et espace (3)
- Géographie politique et espace rural en Slovénie à la croisée des chemins (3)
- Planification régionale et développement régional en théorie et en pratique (3)
- Regionalno planiranje in regionani razvoj med teorijo in prakso (3)
- Slovenska politična geografija in podeželje na razpotju (3)
- Some contributions to the study of landforms and geomorphic processes (3)
- Anthropogenic impact on water conditions (Vistula and Oder river basins) (2)
- Autour du risque (2)
- Geomorphology in the public eye : policy issues, education, and the public. Special issue (2)
- Globalisierung und Verkehr (2)
- Globalization, city-regions and polycentricity in North-West Europe (2)
- Karst systems : dynamics, evolution, paleoenvironmental recordings and natural hazards. Special issue (2)
- Chine (2)
- Asie (2)
- The shoreface-connected ridges along the central Dutch coast
- Coastal dynamics ; Coastal environment ; Model ; Netherlands (The) ; Sediment transport
- The present study adresses to the questions how the shoreface-connected ridges along the central part of the Dutch coast were formed and what their behaviour is under the present hydrodynamic conditions. The study is based on field observations
- and model computations. The field observations focus on the present hydrodynamic and sediment transport processes, on the resulting morphological and sedimentological response, and on the geologic evolution of the ridges. - (AGD)
- Prolegomena to sediment and flow connectivity in the landscape : a GIS and field numerical assessment
- Geographical information system ; Gully erosion ; Italy ; Land use ; Precipitation ; Sediment transport ; Soil erosion ; Toscana ; Water erosion ; Watershed
- This paper presents 2 new definitions of sediment and water flux connectivity (from source through slopes to channels/sinks)with examples of applications to sediment fluxes. The 2 indices of connectivity are operatively defined, one (IC) that can
- connectivity, such as land use and topographic characteristics. This procedure has been applied in a medium-size watershed in Tuscany (Italy) with the aim of evaluating connectivity, identifying connected sediment sources and verifying the effects of mitigation
- be calculated in a GIS environment and represents a connectivity assessment based on landscape's information, and another that can be evaluated in the field (FIC) through direct assessment. IC and FIC are based on recognized major components of hydrological
- measures. The proposed indices can be used for monitoring changes in connectivity in areas with high geomorphological or human induced evolution rates.
- Was there a Pliocene-Pleistocene fluvial-lacustrine connection between Death Valley and the Colorado River?
- Bassin-versant ; California ; Cénozoïque ; Etats-Unis ; Ligne de rivage ; Paléogéographie ; Paléohydrologie ; Pliocène ; Pléistocène ; Réseau de drainage ; Sédiment lacustre ; Sédimentologie
- California ; Cenozoic ; Drainage network ; Lacustrine sediment ; Palaeogeography ; Palaeohydrology ; Pleistocene ; Pliocene ; Sedimentology ; Shoreline ; United States of America ; Watershed
- The purpose of this paper is to present surface and subsurface data from several of the basins along the proposed route to evaluate the geomorphic and sedimentologic evidence for this connection. An accurate determination of this connection
- Buffers, barriers and blankets : the (dis)connectivity of catchment-scale sediment cascades
- Australia ; Drainage density ; Human impact ; Mass movement ; New Zealand ; North Island ; Sediment budget ; Sediment transport ; Slope gradient ; Vertical movement ; Watershed
- This paper introduces the concept of landform impediments, termed buffers, barriers and blankets, that impede sediment conveyance by limiting the connectivity between landscape compartments. Buffers restrict sediment delivery to channels, barriers
- inhibit sediment movement along channels, and blankets drape channel or floodplain surfaces affecting the accessibility of sediment to entrainment. These features operate as a series of switches which turn on/off processes of sediment delivery, determining
- Linking landscape morphological complexity and sediment connectivity
- Connectivity ; Digital elevation model ; Earth surface processes ; Environmental management ; Erosion control ; Fluvial erosion ; River bed ; Sedimentology ; Simulation ; Slope gradient ; Watershed
- Connectivity relates to the coupling of landforms (e.g. hillslopes and channels) and the transfer of water and sediment between them. The aim of this study is to understand and quantify the relation between landscape complexity and catchment
- into the landscape evolution model LAPSUS to simulate the sediment connectivity of each landscape. Additionally, the hypothesis was tested on 6 common real DEMs with widely different morphologies. Finally, the effects of different rainfall time series on catchment
- connectivity. The AA. hypothesize that connectivity decreases with increasing landscape morphological complexity. To quantify the connectivity–complexity relationship virtual digital elevation models (DEMs) with distinct morphologies were used as inputs
- Predicting catchment sediment yield in Mediterranean environments : the importance of sediment sources and connectivity in Italian drainage basins
- Forecast ; Italy ; Landslide ; Mediterranean area ; Model ; Sediment budget ; Soil erosion ; Watershed
- From reservoir sedimentation data of 44 Italian catchments, it appeared that there was a (non-significant) positive relation between catchment area and sediment yield. This is in contrast to what is generally expected from the theory of decreasing
- sediment delivery rates with increasing catchment area. Furthermore, this positive relation suggests that processes other than upland erosion are responsible for catchment sediment yield. Here, the AA. explore the potential of the Factoring Scoring Model
- (FSM) and the Pacific Southwest Interagency Committee (PSIAC) model to predict sediment yield and indicate the most important sediment sources.
- Channel–floodplain connectivity during an extreme flood event : implications for sediment erosion, deposition, and delivery
- Aerial photography ; Australia ; Connectivity ; Digital elevation model ; Flood ; Floodplain ; Fluvial erosion ; LiDAR ; Queensland ; River bed ; Sediment budget ; Spatial variation ; Watershed
- The term connectivity is emerging as an innovative component of catchment erosion modeling studies. However, considerable confusion remains regarding its definition and quantification. The catastrophic flood of January 2011 in the Lockyer valley
- , southeast Queensland, Australia provides an opportunity to examine the connection between channels and floodplains and to determine how these dynamics operate under high flow regimes. High resolution aerial photographs and multi-temporal LiDAR digital
- elevation models (DEMs), coupled with hydrological modeling, are used to assess both the nature of hydrologic and sedimentological connectivity and their dominant controls. Longitudinal variations in flood inundation extent led to the identification of 9
- reaches which displayed varying channel–floodplain connectivity. The results highlight the need to carefully consider non-linear changes in key variables such as channel capacity and flood conveyance in the development of a quantitative connectivity index.
- Controls on slope-to-channel fine sediment connectivity in a largely ice-free valley, Hoophorn Stream, Southern Alps, New Zealand
- Mountain ; New Zealand ; Precipitation ; Rainstorm ; Sediment transport ; South Island ; Suspended load ; Turbidity ; Watershed
- The AA. monitored fine sediment mobilization on a slope segment hydrologically connected to a stream in the ice-free Hoophorn Valley, New Zealand. Gerlach traps were installed in ephemeral slope channels to trap surficial material mobilized during
- rainfall events. Analyses of sediment-discharge hysteresis patterns were used to show if fine sediment connectivity was occuring between the monitored slope segment and the stream channel , and to permit identification of sediment sources within
- the catchment as a whole. Although the data set covers a relatively short-time period, this systematic approach enabled overall assessment of current controls on slope-to-channel fine sediment connectivity, and its implications for how the sediment transfer
- Sediment concentration changes in runoff pathways from a forest road network and the resultant spatial pattern of catchment connectivity
- The AA. identify 2 types of connectivity : direct connectivity via new channels or gullies, and diffuse connectivity as surface runoff reaches the stream network via overland flow pathways. Using a forest road network as an example of a landscape
- Sediment investigations connected with the building of the Øresund Bridge and Tunnel
- Biogenic process ; Bridge ; Coastal environment ; Denmark ; Europe ; Human impact ; Impact ; Model ; Seasonal variability ; Sediment transport ; Sedimentology ; Strait ; Suspended load ; Sweden ; Tunnel ; Turbidity
- The A. presents the results of various sedimentological investigations carried out before, during and after the construction of the bridge and tunnel between Sweden and Denmark 1995-2000. The mean reason for the large focus on the sediment spill
- issue was the potential impact on the marine life, but the marine life also has a significant impact on both the natural sediment transport and on the fate of the spilled sediments. The measurements showed that algae were the main turbidity-creating
- agent during the summer period, and that mussel banks were able to lower the local turbidity. Sediment flux measurements were used in order to measure the effect of the sediment transport regime that the creation of 2 artificial islands had.
- The influence of riparian vegetation cover on diffuse lateral sediment connectivity and biogeomorphic processes in a medium-sized agricultural catchment, Austria
- Austria ; Biogeomorphology ; Conceptual model ; Lower Austria ; Microrelief ; Overland flow ; Riparian vegetation ; Root system ; Sediment transport ; Watershed
- This paper assesses the influence of riparian vegetation cover type on diffuse lateral sediment connectivity on valley floors and investigates biogeomorphic processes acting in forested riparian zones of a medium-sized agricultural catchment
- . Governing processes and factors are assessed using GIS-based overland flow pathway modelling and geomorphic field surveys together with multivariate statistics. The results reveal that diffuse lateral sediment connectivity is highly influenced
- by the respective type of riparian vegetation cover. Forested riparian zones significantly reduce sediment inputs and act as strong disconnectors between the catchment area and the river channel. Topographical features called root dams emerge from biogeomorphic
- processes in forested riparian zones and act as buffers that limit the connectivity between landscape compartments.
- (Dis)Connectivity in catchment sediment cascades : a fresh look at the sediment delivery problem
- Australia ; Channel geometry ; Conceptual model ; Hunter River ; Hydrodynamics ; Model ; New South Wales ; Response time ; Sediment budget ; Sediment transport ; Spatial variation ; Watershed
- This paper presents a conceptual framework for analysis of catchment (dis)connectivity that incorporates both spatial and temporal variability in the operation of the sediment cascade. This approach examines where blockages occur to disrupt
- these longitudinal, lateral and vertical linkages in catchments. Depending on the position of blockages (termed buffers, barriers and blankets), and their sediment residence time, various parts of a catchment may be actively contributing sediment to the sediment
- geomorphologists face in applying such a framework to understand the internal dynamics of the catchment sediment cascades, and forecast how environmental change might affect the operation of sediment fluxes into the future.
- Radiocarbon dating of transitions between marine and lacustrine sediments and their relation to the development of lakes
- Datation ; Géographie de l'Europe ; Holocène ; Lac ; Lagune ; Marge d'erreur ; Niveau marin ; Norvège ; PICG 200 ; Quaternaire marin ; Radiocarbone ; Sédiment lacustre ; Technique de recherche
- In three different areas in western Norway, large errors are obtained in the radiocarbon dates from lacustrine sediments close to marine/lacustrine sediment boundaries. Differences occur between radiocarbon and pollenanalytic dates and between dates
- at isolation/ingression contacts for lakes of the same altitude above present sea-level. The dating errors are connected to periods with more oligotrophic conditions with isoetides. The isoetide vegetation and the dating errors disappear when the lakes become
- Baseflow control on sediment flux connectivity: Insights from a nested catchment study in Central Mexico
- Base level ; Mexico ; Michoacán ; Sediment budget ; Sediment transport ; Suspended load ; Tropical zone ; Water erosion ; Watershed
- In order to assess the extent of sediment connectivity between uplands and lowlands and to quantify the processes of in-channel deposition and remobilization, measurements of suspended sediment fluxes were conducted in Cointzio catchment, a nested
- rural catchment of the Mexican Volcanic Belt. Data were collected over one year at three upland sites. The results show that rather than drainage area, landscape controls were the main drivers of sediment export and surface–subsurface partitioning
- ; widespread rainfall indirectly sustained in-channel erosion; baseflow discharge boosted sediment conveyance in the downstream alluvial plain.
- Making connections: changing sediment sources and sinks in an upland catchment
- Accumulation rate ; Agricultural land use ; Climatic variability ; Data ; England ; Land use ; Man-environment relations ; Precipitation ; Sediment budget ; Soil erosion ; United Kingdom ; Watershed ; Yorkshire
- Changing patterns of connectivity have been studied in the Ingbirchworth Catchment (Yorkshire, UK), using a multiple methodology approach combining the analysis of reservoir-sediment records with knowledge of recent land-use history, high resolution
- rainfall records, catchment characteristics and management aspects. The results demonstrate that typical calculations of catchment-area yields are not sufficient as sediment-contributing areas vary as a consequence of changing conditions. The study provides
- insights into the complex interactions influencing connectivity, such as the relation between catchment changes and climatic inputs, and the subsequent effect on catchment conditions and transfer networks.
- Arid area ; Conceptual model ; Erosion control ; Fluvial dynamics ; Impact ; Mediterranean area ; Riparian vegetation ; Sediment transport ; Spatial distribution ; Stream ; Vegetation
- Studies of sediment connectivity are beginning to yield new insights into the dynamics of dryland rivers, and in particular the role of vegetation in reducing the connectivity of sediment transfers downstream. Detailed surveying at monitored sites
- such as is being carried out within the EU-funded project RECONDES (Conditions for Restoration and Mitigation of Desertified Areas in Southern Europe Using Vegetation) is required to study the interactions between vegetation, sediment and flow in dryland rivers
- A study of river channel pattern information recorded by grain size parameters of fluvial sediment
- Using data from some Chinese rivers, an attempt has been made to express quantitavely, by using statistical methods, the connections between river channel pattern characteristics and the corresponding river bed material grain size parameters.
- Composition and flux of Holocene sediments on the eastern Laptev Sea shelf, Arctic Siberia
- Arctique océan ; Carte bathymétrique ; Datation C 14 ; Fond sous-marin ; Holocène ; Mer de Laptev ; Micro-organisme ; Paléo-environnement ; Plate-forme continentale ; Russie d'Asie ; Réchauffement climatique ; Sibir' ; Sédiment marin ; Taux de
- sédimentation
- Arctic Ocean ; Asian part of Russia ; Bathymetric chart ; C 14 dating ; Climatic warming ; Continental shelf ; Holocene ; Marine sediment ; Micro-organism ; Palaeo-environment ; Sea floor ; Sedimentation rate ; Siberia
- The aim of this paper is to investigate various Holocene sediment records from a high-resolution core on the inner eastern Laptev Sea Shelf. The AMS C 14 chronology of the core allows reliable calculation of shelf sediment budgets. Because
- of the close land-shelf connection, the data not only provide a detailed history of depositional regime but also contain information of the general paleoenvironmental evolution in this region during the Holocene.
- Predicting runoff and sediment connectivity and soil erosion by water for different land use scenarios in the Spanish Pre-Pyrenees
- ) where 83 soil samples were collected. The different maps of hydrological connectivity were used to create runoff and sediment trap effectiveness masks that were included in the assessment of the effective cumulative runoff. The results showed
- This study seeks to assess the effect of agricultural terraces, irrigation channels, trails, and land abandonment on the hydrological connectivity of a small catchment and its consequences on predicting rates of soil erosion under 4 different
- scenarios of land uses. The AA. tackle this goal by running a complex index of hydrological connectivity and a semi-physically based model of soil erosion with geographic information system (GIS) in the Estanque de Arriba catchment (Spanish Pre-Pyrenees
- that : connectivity is high in irrigation channels and agricultural terraces; vegetation factor is as important as the linear landscape elements; more erosion is predicted at the early stage of future land abandonment.
- Seasonal variation of the grain-size composition of the fluvial sediments in various sections of the Prosna channel
- Capacité ; Condition ; Cours d'eau ; Distribution ; Ecoulement ; Fluviatile ; Granulométrie ; Géographie de l'Europe ; Pologne ; Prosna, fleuve ; Sédiment ; Sédimentologie ; Transport solide
- The problem, whether grain size statistical parameters of sediments and their scatter plots are useful for the environmental analysis of sediments, has been of particular interest for years. The opinions as to their usefulness are extremely
- different: from their recommendation to complete negation. This article contains analyses of the fluvial environment sediments collected at the same points but in different periods of time. Results of the investigations show that variation of sediments
- collected from the same points of the channel may be very large, and relations among their different parameters may indicate both a high degree of connection and its lack, depending on water flow conditions in the river channel. (L'A).