inscription
PORTAIL D'INFORMATION GÉOGRAPHIQUE

Résultats de la recherche (157 résultats)

Affinez votre recherche

Par Collection Par Auteur Par Date Par Sujet Par Titre
  • The load of organic carbon, nitrogen and phosphorus from two large drainage basins (River Kitka and River Oulanka) in NE Finland
  • The aim of this paper is to quantify the load of organic carbon, nitrogen and phosphorus from 2 large catchment areas, the River Kitka and the River Oulanka, and the transport of the nutrients into Lake Paanajärvi, a deep oligotrophic lake in NW
  • 1999
  • Channel changes due to river regulation : the case of the Piave River, Italy
  • Special issue : Changing times-Changing rivers
  • This paper deals with the channel changes of the Piave River in the Eastern Alps, Italy, which have occurred during this century in response to human interventions in the fluvial system. The flow regime and the sediment supply of the river have been
  • pattern has changed from braided to wandering. The observed trends of channel change suggest than the river has not yet reached a new equilibrium condition.
  • 1999
  • Rapid formation of river terraces in non-welded ignimbrite along the Hishida River, Kyushu, Japan
  • River terraces are well preserved in the middle to lower reaches of the Hishida River, that flows through the extensive ignimbrite field produced by the large-scale Ito eruption about 24,500 years ago from Aira caldera in southern Kyushu. High
  • erodibility of the non-welded Ito ignimbrite and absence of vegetation on the initial surface would have permitted a rapid dissection of the initial topography and the formation of the river terraces. Thus, it is interpreted that the river terraces were formed
  • 1999
  • River channel changes of the Subansiri in Assam, India
  • The sequential changes in the position of banklines as a result of bank erosion, as well as various changes in the channel have been studied in the Subansiri river in Assam, India. The study was carried out from available topographic maps of 1920
  • , 1970 and satellite imagery of 1990. The types of changes taking place in the Subansiri river channel are grouped into 4 categories. The river channel seems to make a remarkable change from a meandering pattern in 1920 towards a braided pattern by 1990
  • 1999
  • Input, storage and distribution of large woody debris along a mountain river continuum, the Drôme River, France
  • Large woody debris (LWD) were studied along the Drôme River, a French Alpine river with an active shifting channel and a well-developed riparian forest. The objectives are to assess LWD quantities (input from floodplain and in-channel storage
  • ), the preferential sites of LWD deposit and the geomorphological influence of LWD along the river course of a human-modified watershed. These objectives should allow for the proposal of soft-maintenance strategies of LWD.
  • 1999
  • Deposition and storage of fine-grained sediment within the main channel system of the River Tweed, Scotland
  • Special issue : Changing times-Changing rivers
  • Floodplain ; Geochemistry ; Isotope analysis ; River bed ; Scotland ; Sediment budget ; Sedimentation ; Stream ; Suspended load ; United Kingdom ; Watershed
  • This paper assesses the importance of deposition and storage of fine-grained (c.
  • 1999
  • Fluvial geomorphology and river engineering : future roles utilizing a fluvial hydrosystems framework
  • Applied geomorphology ; Bank erosion ; Ecosystem ; Flood ; Floodplain ; Hydrosystem ; Impact ; Mass movement ; River management ; Scotland ; Stream ; United Kingdom
  • engineers about the value of geomorphology. Areas in which geomorphologists will increasingly be able to complement engineers in river management include risk and environmental impact assessment, floodplain planning, river audits, determination of instream
  • flow needs, river restoration, and design of ecologically acceptable channels and structures.
  • 1999
  • The main aim of this paper is to determine and describe the ecotype categories of the catchment area of the River White Nyikó (W Romania). This river is the most important right hand tributary of the River Great Küküllö in Central Transylvania
  • 1999
  • Geomorphologic analysis of the Losenice River catchment area
  • Results of detailed geomorphic research and mapping in the territory of the goldbearing Losenice River catchment area in Šumava Mts. The component of the geographical presents the geomorphologic analysis and classification of landforms
  • 1999
  • vltava River terrace system between Lipno and Rožmberk nad Vltavou
  • A contribution to the knowledge of the geomorphologic development of the Upper Vltava river valley between Lipno-dam and Rožmberk nad Vltavou, using the terrace system reconstruction and comparison with Neogene gravel locations in the Vltava-Danube
  • 1999
  • Bench development along the regulated, lower River Dee, UK
  • This paper examines the nature of channel width reduction and associated bench forms along a lowland sector of a regulated, single-thread river, the River Dee, North Wales, UK. Such patterns are suggested to have important implications for riparian
  • 1999
  • Anabranching rivers on the Northern Plains of arid central Australia
  • This paper has three main aims : first, to provide a comprehensive description of the morphological, hydraulic and sedimentological characteristics of anabranching rivers in the Alice Springs region; second, to illustrate factors contributing
  • to the formation and maintenance of anabranching river patterns; and third, to consider the implications of anabranching for flow and sediment discharge.
  • 1999
  • Elaboration on the nature of woody debris : an ethical snag in the aesthetic justification of organized river cleanup
  • AA. deconstruct the claim that a river restored to its natural state is a public good. Organized public cleanups such as those sponsored by America Outdoors can disrupt aquatic habitat. Discussed are five responses from river cleanup organizations
  • 1999
  • SPOT image used in river water suspended sediment and its environmental background analysis
  • High spatial and spectral resolution sensors such as Landsat Thematic mapper were usually used to estimate the suspended sediment concentrations in the coastal zones. When studying the suspended sediment concentration in Danshui River in Taiwan
  • , SPOT image was used because of its higher spatial resolution and this river being not as wide enough as the coastal area. Composite of band1 and band2 was found the best combination to express the suspended sediment. And the relationship of river
  • 1999
  • Use of floodplain sediment cores to investigate recent historical changes in overbank sedimentation rates and sediment sources in the catchment of the River Ouse, Yorkshire, UK
  • This paper reports the use of sediment cores collected from river floodplains to provide information on changing suspended sediment sources and sedimentation rates at 7 sites within the non-tidal component of the catchment of the River Ouse, and one
  • of its main tributaries, the River Wharfe, in Yorkshire. The results enable estimates of contemporary suspended sediment fluxes and sources to be placed into a historical context and provide a means of considering the likely impact of potential future
  • 1999
  • Temporal and spatial variability in thalweg profiles of a gravel-bed river
  • Special issue : Changing times-Changing rivers
  • California ; Channel geometry ; Flood ; Gravel ; Longitudinal section ; River bed ; Sediment load ; Spatial variation ; Stream ; United States of America
  • This study used successive longitudinal thalweg profiles in gravel-bed rivers to monitor changes in bed topography following floods and associated large sediment inputs. Variations in channel bed elevations, distributions of residual water depths
  • 1999
  • Quantifying geomorphic and riparian land cover changes either side of a large flood event using airborne remote sensing : River Tay, Scotland
  • Bank erosion ; Channel geometry ; Flood ; Floodplain ; LANDSAT ; Remote sensing ; Riparian vegetation ; River bed ; Scotland ; Stream ; Thematic Mapper ; United Kingdom
  • The potential of a high resolution multi-spectral airborne remote sensing to detect and quantify changes in channel morphology and riparian land cover are illustrated. The River Tay is a partially embanked wandering gravel bed river, and Airborne
  • 1999
  • Principles of engineering geomorphology for managing channel erosion and bedload transport, example from French rivers
  • Alps (The) ; Applied geomorphology ; Bank erosion ; Carrying capacity ; Concept ; Ecosystem ; Flood ; France ; Natural hazards ; River management ; Stream ; Sustainable development
  • French rivers have been transformed by centuries of development to satisfy various social demands such as navigation, hydro-electric power production, flood control, or checking erosion. These modifications have led to impacts that are detrimental
  • to ecology, to resources, and to human interests. In recent years, increased public and management awareness of these problems has given way to new conceptions and objectives in the field of river engineering, among which the goal of establishing sustainable
  • 1999
  • Time and the persistence of alluvium : river engineering, fluvial geomorphology, and mining sediment in California
  • Alluvium ; California ; Carrying capacity ; Channel geometry ; Flood ; Gold ; Hydrosystem ; Impact ; Mining activity ; Nineteenth Century ; River management ; Stream ; Twentieth Century ; United States of America
  • This paper describes fundamental differences between river engineering and fluvial geomorphology, reviews a few time-related geomorphic concepts, and argues for an increased use of historical geomorphology in river management. It finishes
  • 1999
  • A method of analysing stream channel response to environmental change : gauge data for the Tully River
  • a simple method for analysis of these data, and a brief case study of an application to channel change in the Tully River, in the humid tropics of north Queensland. The analysis suggests that this channel has narrowed and deepened, rather than aggraded.
  • 1999