inscription
PORTAIL D'INFORMATION GÉOGRAPHIQUE

Résultats de la recherche (213 résultats)

Affinez votre recherche

Par Collection Par Auteur Par Date Par Sujet Par Titre
  • Protracted active surge phase in the high arctic (Svalbard) : dynamic development and morphological impact
  • Arctic Region ; Cold area ; Geomorphology ; Glacial surge ; Glacier ; Glacier dynamics ; Impact ; Model ; Moraine ; Svalbard
  • Années 1991-2002 ; Arctique ; Crue glaciaire ; Dynamique glaciaire ; Glacier ; Géomorphologie ; Impact ; Modèle ; Moraine ; Svalbard ; Zone froide
  • Glacial surges in Svalbard are protracted and characterized by individual dynamic evolution, in contrast to many other areas, which calls for a subdivision of the classic two-phased surge cycle. A dominating part of the ice masses seem to have
  • a surge potential and this represents a considerable challenge for paleoclimatic studies. Glaciological and geological models therefore need to be coupled. The issue is discussed with Fridtjovbreen glacier as an example.
  • 2014
  • A dynamic spatial weight matrix and localized space-time autoregressive integrated moving average for network modeling
  • England ; London ; Matrix analysis ; Space time ; Spatial autocorrelation ; Spatial dynamics ; Spatial weighting ; Statistics ; Transport network ; United Kingdom ; Urban traffic ; Urban transport
  • Il s'agit de décrire l'autocorrélation dans des données de réseau avec une matrice dynamique spatiale pondérée et un modèle STARIMA qui capture l'auto-corrélation locale et dynamique. Test avec des données relatives au trafic dans le centre de
  • Londres. Les performances sont améliorées par rapport aux modèles standards STARIMA utilisés couramment en modélisation spatio-temporelle.
  • 2014
  • Residential location choice modelling : a micro-simulation approach
  • Choix de l'habitat ; Evolution démographique ; Indicateurs socio-économiques ; Jihočeský ; Localisation ; Marché immobilier ; Modèle ; Tchèque république ; Tábor
  • Czech Republic ; Demographic change ; Jihočeský ; Location ; Model ; Real estate market ; Residential choice ; Socio-economic indicators
  • disaggregated data describing the demographics of households, their socio-economic characteristics, and real estate market dynamics needs to be resolved in order to exploit the full potential of micro-simulation modelling in the future. - (EN)
  • Micro-simulation models have been increasingly used for studying various urban and regional processes. Here, two experimental microsimulation models are applied to the study of residential location choices of inhabitants of the Tábor micro-region
  • . The ability of the micro-simulation models to replicate the observed residential choices is evaluated by several quantitative indicators with special attention given to the stochasticity of the model behaviour. The limited availability of sufficiently
  • 2014
  • Holocene sediment dynamics in the vicinity of a Roman battlefield near Osnabrück (NW-Germany)
  • Absolute dating ; Colluvium ; Geoarchaeology ; Geographical information system ; Germany ; Holocene ; Human impact ; Landscape dynamics ; Model ; Niedersachsen ; Quaternary ; Sediment budget ; Soil erosion
  • Action anthropique ; Allemagne ; Bilan sédimentaire ; Colluvions ; Datation absolue ; Dynamique du paysage ; Erosion des sols ; Géoarchéologie ; Holocène ; Modèle ; Niedersachsen ; Quaternaire ; Système d'information géographique
  • The interpretation of the Holocene sediment dynamics at Mount Kalkriese in the Wiehengebirge mountains (northwestern Germany) shows that the onset and the extent of human land use corresponds well with most colluvial archives in Central European
  • loess regions. This study shows typical problems when using the soilscape model for calculating the sediment budget: since truncated soil profiles are used to model eroded volumes, only minimum soil erosion is mapped. This can lead to a considerable
  • tool in landscape interpretation. Due to the small number of numerical ages, the landscape model at Mount Kalkriese has to be considered preliminary.
  • 2014
  • externalities by extending the “advantages of backwardness” approach, formerly developed to explain the catching-up of national economies, to the regional conecontext. Second, it presents a new model that relates static and dynamic externalities
  • This paper explores the existence of different types of static and dynamic externalities and shows the relationship between externalities, interregional trade, and cluster policy. First, it contributes to a better characterization of dynamic
  • regions. The major conclusion is that policy must pursue a combination of the comparative advantage principle with one type of dynamic externalities un-covered in this paper: the “related variety benefits” of agglomeration.
  • 2014
  • The stream power river incision model : evidence, theory and beyond
  • Channel geometry ; Downcutting ; Fluvial dynamics ; Knickpoint ; Longitudinal section ; Model ; Stochastic model ; Stream
  • Cours d'eau ; Dynamique fluviale ; Géométrie hydraulique ; Incision ; Modèle ; Modèle stochastique ; Profil longitudinal ; Rupture de pente
  • The stream power incision model (SPIM) is a cornerstone of quantitative geomorphology. It states that river incision rate is the product of drainage area and channel slope raised to the power exponents m and n, respectively. It is widely used
  • to predict patterns of deformation from channel long profile inversion or to model knickpoint migration and landscape evolution. Numerous studies have attempted to test its applicability with mixed results prompting the question of its validity. This paper
  • 2014
  • Hyperscale terrain modelling of braided rivers : fusing mobile terrestrial laser scanning and optical bathymetric mapping
  • Balayage laser terrestre ; Bathymétrie ; Chenal anastomosé ; Cours d'eau ; Géomorphodynamique ; Modèle ; Modèle numérique de terrain ; Nouvelle-Zélande ; Rees River ; South Island ; Transport sédimentaire
  • Bathymetry ; Braided channel ; Digital elevation model ; Earth surface processes ; Model ; New Zealand ; Sediment transport ; South Island ; Stream ; Terrestrial laser scanning
  • This paper identifies a threefold set of challenges associated with surveying these dynamic landforms : complex relief, inundated shallow channels and high rates of sediment transport, and terms these challenges the morphological, wetted channel
  • and mobility problems, respectively. In an attempt to confront these issues directly, this paper presents a novel survey methodology that combines mobile terrestrial laser scanning and non-metric aerial photography with data reduction and surface modelling
  • techniques to render DEMs from the resulting very high resolution datasets. The approach is used to generate and model a precise, dense topographic dataset for a 2.5 km reach of the braided Rees River, New Zealand. A detailed error analysis of the resulting
  • sub-metre resolution is described to quantify DEM quality across the entire surface model. This reveals unparalleled low vertical errors for such a large and complex surface model.
  • 2014
  • [b3] Fluid Dynamics Research Group, Dept. of Environment and Soil Sciences, Univ., Lleida, Espagne
  • Spatio-temporal dynamics of maize cropping system in Northeast China between 1980 and 2010 by using spatial production allocation model
  • Agroclimatologie ; Altitude ; Analyse spatiale ; Années 1980-2010 ; Chine ; Chine du Nord-Est ; Espace-temps ; Latitude ; Longitude ; Maïs ; Modèle ; Production agricole
  • Agricultural production ; Agroclimatology ; Altitude ; China ; Latitude ; Longitude ; Maize ; Model ; North-Eastern China ; Space time ; Spatial analysis
  • Based on the cross-entropy theory, a spatial production allocation model (SPAM) has been developed for presenting spatio-temporal dynamics of maize cropping system in Northeast China during 1980–2010, at the pixel level. The AA. further explored
  • 2014
  • Simulating the urban growth dimensions and scenario prediction through sleuth model : a case study of Rasht County, Guilan, Iran
  • Forecast ; Gilan ; Growth model ; Iran ; Model ; Simulation ; Urban dynamics ; Urban growth ; Urban sprawl ; Urbanization
  • Croissance urbaine ; Dynamique urbaine ; Etalement urbain ; Gīlān ; Iran ; Modèle ; Modèle de croissance ; Prévision ; Rasht County ; Simulation ; Urbanisation
  • In this study, the SLEUTH UGM has been calibrated through a sequential multistage automated method to derive the pattern of urban growth in Rasht County from 1975 up to year 2011. According to the results, successive improvement of the model
  • parameters during the calibration mode indicates applicability of the model for forecasting of future urban growth mechanism until the year 2050. Accordingly, two growth scenarios were developed mainly with the aim of investigating the coefficients’ role
  • in controlling the nature of urban dynamics. Comparison between two forecasted scenarios indicates insignificant difference in total amount of the urban area, which denotes there is a threshold to urbanization and the current trend of urban growth could
  • 2014
  • Coupled numerical–analytical approach to landscape evolution modeling
  • Capture fluviale ; Géomorphodynamique ; Modèle ; Modèle numérique ; Mouvement de masse ; Nouvelle-Zélande ; Précipitation ; Réseau de drainage ; South Island ; Tectonique ; Versant
  • Drainage network ; Earth surface processes ; Fluvial capture ; Mass movement ; Model ; New Zealand ; Numerical model ; Precipitation ; Slope ; South Island ; Tectonics
  • The AA. propose a new approach for landscape evolution modeling that couples irregular grid-based numerical solutions for the large-scale fluvial dynamics and continuum-based analytical solutions for the small-scale fluvial and hillslope dynamics
  • . The new approach is implemented in the landscape evolution model DAC (divide and capture). The geometrical and topological characteristics of DAC's landscapes show compatibility with those of natural landscapes. A comparative study shows that, even
  • 2014
  • Assessing river dynamics from 2D hydraulic modelling and high resolution grain-size distribution
  • Braided channel ; Central Pyrenees ; Channel geometry ; Discharge ; Flood ; Fluvial dynamics ; Fluvial erosion ; Grain size distribution ; Gravel ; Model ; River bed ; Scouring ; Spain ; Stream
  • Affouillement ; Chenal anastomosé ; Cours d'eau ; Crue ; Dynamique fluviale ; Débit ; Erosion fluviatile ; Espagne ; Granulométrie ; Gravier ; Géométrie hydraulique ; Lit fluvial ; Modèle ; Pyrénées centrales
  • A new approach is proposed to study gravel riverbed stretches at high resolution. During a two-year period, flood events in the River Isábena (Central Pyrenees) were reproduced using a steady-state 2D hydraulic model (Hydro2de) with the aim
  • of studying gravel riverbed dynamics. The parameters included detailed grain size at 1.5 x 1.5 m resolution, topographic data and field measurements along an 11 km stretch. Discharge data were obtained from 2 gauging stations and velocity and maximum water
  • width were measured at 15 control cross-sections. Observed and modeled results show good agreement. Additionally, shear stress for several discharges and related critical shear stress were compared for the whole river stretch. The initiation of sediment
  • 2014
  • Automate cellulaire ; Dune ; Géomorphodynamique ; Géomorphologie ; Modèle ; Modèle stochastique
  • Cellular automaton ; Dune ; Earth surface processes ; Geomorphology ; Model ; Stochastic model
  • to investigate the dynamics of complex systems. The models in ReSCAL are essentially constructed from a small number of discrete states distributed on a cellular grid. An elementary cell is a real-space representation of the physical environment and pairs
  • The AA. present the Real-Space Cellular Automaton Laboratory (ReSCAL), a powerful and versatile generator of 3D stochastic models. The aim of this software suite, released under a GNU licence, is to develop interdisciplinary research collaboration
  • 2014
  • Can δ13C abundance, water-soluble carbon, and light fraction carbon be potential indicators of soil organic carbon dynamics in Zoigê wetland?
  • In this study, four wetland sites and one degraded wetland site in the Zoigê alpine wetland, located at the Qinghai-Tibet Plateau, were selected to investigate the relationships of stable isotope and labile organic carbon dynamics with groundwater
  • elevation or water table level. The AA.also examine if the δ13C abundance, soil water soluble organic carbon (WSOC), light fraction organic carbon (LFOC), can be used as potential indicators of soil organic carbon (SOC) dynamics in these wetland sites
  • . The results showed that the plant dominant species in the degraded wetland site were different from those in the non-degraded wetland sites. The regression analysis showed that LFOC was the best potential indicator of SOC dynamics with WSOC and soil δ13C being
  • less useful as indicators, respectively. In addition, the absolute slope coefficients of the regression models increased as the soil depth increased, which indicated that the SOC turnover increased with soil depth.
  • 2014
  • The social dynamics of suburbanization : insights from a qualitative model
  • This article examines the social dynamics between in two European suburban areas: the Wirral (Liverpool), UK and Leipzig, Germany. The results suggest that these social dynamics would, if other possible influences are ignored, lead to a situation
  • 2014
  • Spatiotemporal dynamics of carbon intensity from energy consumption in China
  • Autocorrélation spatiale ; Carbone ; Changement climatique ; Chine ; Consommation d'énergie ; Développement durable ; Espace-temps ; Modèle ; Réchauffement climatique
  • Carbon ; China ; Climatic change ; Climatic warming ; Energy consumption ; Model ; Space time ; Spatial autocorrelation ; Sustainable development
  • This paper examines the spatiotemporal dynamics and dominating factors of China’s carbon intensity from energy consumption, in 1997–2010, using the spatial autocorrelation analysis, and explain the dominating factors through spatial panel
  • econometric model. The aim is to provide scientific basis for policy making on energy conservation and carbon emission reduction in China. The AA. propose some suggestions from the perspective of fossil energy utilization and structural adjustment of energy
  • 2014
  • Modeling net primary productivity of the terrestrial ecosystem in China from 1961 to 2005
  • Biosphere ; China ; Climatic data ; Ecosystem ; Environmental change ; Modelling ; Primary productivity ; Simulation ; Spatial variation ; Vegetation dynamics
  • This study simulated the net primary productivity (NPP) of China's ecosystems based on the dynamic global vegetation model (DGVM) Integrated Biosphere Simulator (IBIS) with data on climate, soil, and topography. The applicability of IBIS in the NPP
  • to the simulations conducted with other models. The simulations are also close to the NPP estimations based on remote sensing. The AA. then simulated NPP with climate change data from 1961 to 2005, when warming was particularly striking. The results highlighted
  • 2014
  • Beach ; Coastal dynamics ; Coastal geomorphology ; Coastline ; Intertidal zone ; Island ; Model ; United Kingdom ; Wales ; Wave
  • Carmarthen Bay ; Dynamique littorale ; Géomorphologie littorale ; Ile ; Modèle ; Plage ; Royaume-Uni ; Trait de côte ; Vague ; Wales ; Zone intertidale
  • and statistical analyses agreed with wave model results. These were correlated to morphological change and it was concluded that offshore islands change wave dynamics and modify the morphology of embayed beaches in their lee. Consequently, this work provides
  • to 6 months. Modelled inshore breaking waves had less energy than offshore ones and the former behaved differently between the low and high tidal zones. Variations in wave direction from directly behind the islands resulted in reduced wave heights
  • 2014
  • Do not only connect : a model of infiltration-excess overland flow based on simulation
  • Bassin-versant ; Connectivité ; Ecoulement ; Ecoulement superficiel ; Erosion hydrique ; Infiltration ; Modèle ; Pente de versant ; Précipitation ; Simulation
  • Connectivity ; Infiltration ; Model ; Overland flow ; Precipitation ; Runoff ; Simulation ; Slope gradient ; Water erosion ; Watershed
  • and spatially differing infiltration rates. The goal of the model is to relate the cell-scale processes to the behaviour of the hillslope as a whole, examining the response to a range of simple storms on randomly generated surfaces of different roughness, some
  • with no structure and others with a structure developed by erosional processes acting on an initially random surface. The model has also been applied to a 10-year rainfall record, using both hourly and daily time steps, and the implications explored for coarser
  • scale models. Initial trails incorporating erosion continuously update topography and suggest that successive storms produce an initial increase in erosion as rilling develops, while runoff totals are only slightly modified. Other factors not yet
  • considered include the dynamics of soil crusting and vegetation growth.
  • 2014
  • Lichenometric dating of Little Ice Age glacier moraines using explicit demographic models of lichen colonization, growth, and survival
  • Alaska ; Dating ; Glacier ; Holocene ; Lichenometry ; Little ice age ; Model ; Moraine ; Quaternary ; Uncertainty ; Vegetation dynamics
  • Alaska ; Datation ; Dynamique de la végétation ; Ghisma ; Glacier ; Holocène ; Incertitude ; Lichénométrie ; Modèle ; Moraine ; Petit âge glaciaire ; Quaternaire
  • To date 3 terminal moraines of an Alaskan glacier, the AA. used a new lichenometric technique in which surfaces are dated by comparing lichen population distributions with the predictions of ecological demography models with explicit rules
  • for the biological processes that govern lichen populations : colonization, growth, and survival. Working with 2 lichen taxa, the AA. used multinomial-based likelihood functions to compare model predictions with measured lichen populations, using only the thalli
  • plausible, and reveal glacier terminus retreat after a Little Ice Age maximum advance around AD 1816, with accelerated retreat starting in the early to mid twentieth century. Importantly, this technique permits calculation of prediction and model uncertainty.
  • 2014
  • Evaluating a spatially-explicit and stream power-driven erosion and sediment deposition model in Northern Vietnam
  • Bassin-versant ; Distribution spatiale ; Ecoulement fluvial ; Erosion des sols ; Erosion hydrique ; Gestion de l'environnement ; Modèle ; Montagne ; Utilisation du sol ; Viêt Nam ; Viêt Nam du Nord ; Zone intertropicale
  • Environmental management ; Land use ; Model ; Mountain ; Soil erosion ; Spatial distribution ; Stream flow ; Tropical zone ; Vietnam ; Water erosion ; Watershed
  • The AA. present a newly developed dynamic and spatially-explicit EROsion and sediment DEPosition model (ERODEP), which simulates soil erosion by stream power principles, sediment deposition based on texture-specific settling velocity classes
  • , and sediment re-entrainment to move previously deposited particles back into runoff flow. ERODEP runs on a daily basis and was linked with the Land Use Change Impact Assessment model (LUCIA) building on its hydrological and vegetation growth routines
  • . The combined modelling framework was employed for a period of 4 years using field datasets of a small case study watershed, in Ban Tat, Hoa Binh province. ERODEP-LUCIA simulated reasonably well soil erosion and sediment deposition patterns following the annual
  • 2014