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- (1854-1968) ; Arctique ; Atmosphère ; Centre d'action ; Circulation atmosphérique ; Dynamique de l'atmosphère ; Europe ; Europe du Nord ; Groenland ; Géographie physique ; Hiver ; Interaction glace-atmosphère ; Interaction océan-atmosphère ; Océan ; Température ; Téléconnexion ; Zone froide (1)
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- (1941-1970) ; Altitude ; Analyse multivariée ; Climat ; Etats-Unis ; Great Basin ; Géographie physique ; Montagne ; Orientation ; Précipitation ; Précipitation orographique ; Régression multiple ; Régression pas à pas ; Type de temps ; Variabilité spatiale ; Variabilité temporelle ; Zone tempérée (1)
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- Degrees of separation : hillslope-channel coupling and the limits of palaeohydrological reconstruction
- This paper aims to discuss the limitations of developing potential transfer functions for palaeohydrological reconstructions of climate records in 2 linked ways. First, the effective of hillslope-channel coupling will be assessed to evaluate
- the ways in which catchment structure may affect the transmission of water and sediment. Secondly, a model that is capable of representing the dynamics of differently coupled catchment systems will be used to evaluate the potential response of catchments
- Coupling between hillslopes and channels in upland fluvial systems : implications for landscape sensitivity, illustrated from the Howgill Fells, northwest England
- This paper assesses the role of hillslope/channel coupling for the sensitivity of upland geomorphic systems, using evidence from a 30-year monitoring programme of geomorphic change in the Carlingill valley, Howgill Fells, northwest England
- . The magnitude and frequency characteristics of geomorphic activity over the last 30 years are examined within each functional zone of the Carling valley. Coupling characteristics are established and the implications for the sensitivity of the system
- Geomorphic coupling of hillslope and channel systems in two small mountain basins
- The influence of sediment supply on the channel morphology of upland streams : Howgill Fells, Northwest England
- Channel geometry ; Climatic variation ; England ; Floods ; Fluvial processes ; Soil erosion ; United Kingdom
- The sediment supply from hillslopes is controlled by thresholds of hillslope stability, storm event frequency, and the coupling between the hillslopes and the channel. Climatically-induced changes in any of these three factors may have implications
- for channel morphology and stability. This paper examines these implications in British upland fluvial systems, with particular reference to the Howgill Fells, Cumbria, in the contexts of the adjustment of stream channels to sediment supply from erosional
- Geomorphic coupling between hillslopes and channels in the Swiss Alps
- The AA. applied dendrogeomorphic methods to identify the hillslope–channel relationship and the sediment transfer dynamics within an alpine catchment. The Schimbrig catchment, located in the central Swiss Alps, can be divided into 2 distinct
- geomorphic sectors. To the east, the Schimbrig earth flow is the largest sediment source of the basin, while to the west, the Rossloch channel network is affected by numerous shallow landslides responsible for the supply of sediment from hillslopes
- to channels. To understand the connectivity between hillslopes and channels and between sources and sink, trees were sampled along the main Rossloch stream, on the Schimbrig earth flow and on the Rossloch depositional area. Geomorphic observations
- and dendrogeomophic results indicate different mechanisms of sediment production, transfer and deposition between upper and lower segments of the channel network. Tree analysis allowed the reconstruction of periods of high activity during the last century
- Hillslope-channel sediment transfer in a slope failure event : Wet Swine Gill, Lake District, northern England
- The aims of this investigation are to 1) provide a detailed account of an upland slide/debris flow, assessing coupling between the hillslope and the downstream channel and 2) consider the run-out dynamics and efficiency of sediment transmission
- Effective timescales of coupling within fluvial systems
- and the propagation of the effects of base-level change up the system. They can be viewed at several scales : local and larger scales. These trends are illustrated particularly by the examples of hillslope-to-channel coupling inthe Howgill Fells, northwest England
- This paper presents a review of the coupling concept in fluvial geomorphology, based mainly on previously published work. Coupling mechanisms link the components of the fluvial system, controlling sediment transport down the system
- Gully, channel and hillslope erosion - an assessment for a traditionally managed catchment
- and scour holes appear to be resilient landscape features. Significant linkages were found between hillslope erosion and change in erosion feature depth, indicative of a strong hillslope–channel coupling.
- This study reports on a series of 34 gully heads and other erosion features, such as scour holes (5 in total), located in channels in a catchment largely undisturbed by European activity in the Northern Territory, Australia over a 5 year period
- to traditional management practice. The results show that the erosion features have changed little during this 5 year period. A remote sensing assessment found no relationship between erosion feature morphology and hillslope erosion. The monitored gullies heads
- Distribution of erosion across bedrock channels
- Bank erosion ; Channel geometry ; Cross section ; Erodibility ; Fluvial erosion ; Runoff ; Sediment load ; Shear stress ; Stream ; Stream flow ; Suspended load ; Taiwan
- Lateral erosion in bedrock rivers is an important control on the shape of channel cross-sections, and the coupling of channels and hillslopes. Recent observations link lateral erosion to the variability of flow. The AA. propose 2 mechanisms
- to explain this. One is based on changing shear stress distributions within the channel with varying flood level, the other on the competition between cover and tool effects in fluvial bedrock erosion. They assess these processes for the Liwu River, Taiwan
- The aim of this study is to examine spatial variations and process controls on sediment transfer in an upland torrent system (hillslopes, channel and fan). The study site is Iron Crag, a small torrent system situated in the northern Lake District
- . The importance of the channel-fan coupling is clearly demonstrated in that more than 90 per cent of fan sedimentation is derived from channel sediment sources.
- . Partcle size analysis of hillslope sediments trapped during transport suggests sediment calibre is controlled primarily by sediment source. Freeze-thaw and rainfall processes impart a weak but recognizable size sorting signature on the trapped sediments
- Coupling between hillslope gully systems and stream channels in the Howgill Fells, northwest England : temporal implications
- The AA. illustrate the influence of initial conditions with examples drawn from two well-studied systems : the formation of ridge-and-valley topography through the coupled evolution of soil-mantled hillslopes and fluvial channels, and the emergence
- are controlled by the degree of hillslope-channel coupling, and the extent and characteristics of non-alluvial storage mechanisms.
- Regolith stripping and the control of shallow translational hillslope failure : application of a two-dimensional coupled soil hydrology-slope stability model, Hawke's Bay, New Zealand
- This paper explores the hypothesised influence of progressive regolith stripping and redeposition on slope failure using a recently developed process-based model. This model couples dynamic hydrology with slope stability analysis, allowing to relax
- Coupling mechanisms in double sandbar systems. Part 2 : impact on alongshore variability of inner-bar rip channels
- Aquitaine ; Coastal dynamics ; Coastal environment ; Coastal geomorphology ; France ; Model ; Morphological coupling ; Sand bar ; Self-organizing behaviour
- coupling rather than self-organization alone. Morphological coupling may thus be more important to understanding and predicting the evolution of inner-bar rip channels than previously envisaged.
- Double sandbar systems are common morphological features along sandy, wave-dominated, micro- to meso-tidal coastlines. Here the AA. use a numerical model to show that the relative importance of self-organization and morphological coupling changes
- in favour of the latter with an increase in waterdepth variability along the outer-bar crest. Furthermore, they find that the typical alongshore variability in inner-bar rip-channel scale is indicative of a mixture of self-organization and morphological
- Application of capacitively-coupled and DC electrical resistivity imaging for mountain permafrost studies
- of OhmMapper, a capacitively-coupled resistivity system, which overcomes the problem of direct (galvanic) electrode contact in highly resistive environments and has been successfully applied on arctic permafrost, was compared to standard multi-channel
- 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
- erosion by prolonged channel-hillslope coupling, which smoothes relief, and (2) erosion by valley glaciers that generates relief. Finally, their results suggests that the catchment-scale relief of the Andes between 28°S to 35°S is characterized
- The AA. propose a framework that integrates a geomorphic component into the physically-based and spatially distributed TIN-based Real-time Integrated Basin Simulator (tRIBS) model. The coupled model simulates main erosive processes of hillslopes
- (raindrop impact detachment, overland flow entrainment, and diffusive processes) and channel (erosion and deposition due to the action of water flow). In addition to the spatially distributed, dynamic hydrologic variables, the model computes the sediment
- On the surface circulation in some channels of the Canadian Arctic Archipelago
- This paper advances an explanation for the presence of surface currents in opposite directions on facing sides of some of the main channels of the Canadian Arctic Archipelago. It is found that geostrophic dynamics coupled with geometrical