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Résultats de la recherche (53 résultats)

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Par Collection Par Auteur Par Date Par Sujet Par Titre
  • Effect of particle density and inflow concentration of suspended sediment on bedload transport in rill flow
  • Carrying capacity ; Experimentation ; Kaolinite ; Model ; Rill wash ; Runoff ; Sand ; Sediment load ; Sediment transport ; Soil erosion ; Suspended load
  • Laboratory flume experiments were carried out to evaluate the effect of particle density on bedload transport of sand-sized particles and the effect of a suspended load of clay particles (kaolinite) on bedload transport of sand-sized particles
  • but the effect of particle density on transport rates was much less important than flow discharge. Velocity measurements of clear flow, flow mixed with coarse particles and coarse particles confirmed the existence of a differentiation between suspended load
  • 2009
  • Fingerprinting upland sediment sources : particle size-specific magnetic linkages between soils, lake sediments and suspended sediments
  • Cluster analysis ; Cumbria ; England ; Grain size distribution ; Lacustrine sediment ; Lake ; Magnetic susceptibility ; Sediment transport ; Sedimentology ; Soil erosion ; Suspended load ; Tracer ; United Kingdom ; Watershed
  • suspended load, and the recent (post-nineteenth century) sediments in the deep lake basin.
  • Here, the AA. use magnetic fingerprinting to characterize soils, and examine their affinity with and contribution to suspended sediments transported within 2 subcatchments feeding Bassenthwaite Lake, northwest England. Combining the spatial
  • with the suspended sediments and lake sediments. Examination of the cluster affinity of the soils, suspended sediments and lake sediments indicates that topsoils of the upper Newlands Valley and subsoils around Keskadale Beck are a major source of the Newlands Beck
  • 2009
  • Hydroclimatic and channel snowpack controls over suspended sediment and grain size transport in a High Arctic catchment
  • Arctic Region ; Canada ; Carrying capacity ; Cold area ; Grain size distribution ; Impact ; Nunavut ; Polar region ; Snow ; Stream ; Suspended load ; Watershed
  • characteristics, sediment load and accessibility, and suspended sediment grain-size characteristics. Results from years with substantially different snowpack conditions and discharge and sediment delivery responses provide a comprehensive understanding
  • This study reports the relationship between discharge and suspended sediment characteristics in a small High Arctic catchment, at Cape Bounty, Melville Island, Nunavut. Based on 3 seasons of field observations (2004-2006), suspended sediment
  • of the sensitivity of suspended sediment yield in High Arctic rivers to climate variability and point to the critical role of channel snowpack.
  • 2009
  • Seasonal patterns of suspended sediment transport in an abandoned farmland catchment in the Central Spanish Pyrenees
  • Central Pyrenees ; Land use ; Mediterranean area ; Mountain ; Plant cover ; Seasonality ; Sediment transport ; Spain ; Suspended load ; Water erosion ; Watershed
  • This study investigated the suspended sediment response of the Arnás research catchment (in the headwaters of the Aragón River), affected in the past by agricultural practices and more recently by plant recolonization, in relation to its
  • hydrological functioning. The magnitude of suspended sediment transport and its temporal distribution were firstly analysed, then relationships between suspended sediment transport, and rainfall and discharge variables at the event scale were explored
  • , and the roles played by different hydrological processes in the sediment response were assessed. Finally, analysis was undertaken of the hysteretic effect of suspended sediment concentrations (SSCs) and discharge during floods, in order to clarify the runoff
  • generation and suspended sediment transport processes operating within the catchment.
  • 2009
  • Suspended sediment transport in a small Mediterranean agricultural catchment
  • Agricultural land use ; Arid area ; Baleares ; Mallorca ; Mediterranean area ; Multiple regression ; Runoff ; Sediment transport ; Soil erosion ; Spain ; Suspended load ; Turbidity ; Watershed
  • The aim of this study is to analyze suspended sediment transport in a Mediterranean agricultural catchment under traditional soil and water conservation practices. Field measurements were conducted in Can Revull, a small ephemeral catchment
  • on the island of Mallorca. This study uses continuous turbidity records to analyse suspended sediment transport regimes, construct and interpret multiple regression models of total suspended sediment concentration (SSC) and of SSC related to stormflow discharge
  • , and assess the sediment loads and yields of 3 hydrological years (2004-2005 to 2006-2007). Multiple regression models identify rainfall intensity as the most significant variable in sediment supply. However, the historical use of soil conservation practices
  • 2009
  • Increase in suspended sediment discharge of the Amazon River assessed by monitoring network and satellite data
  • Amazonas River ; Brazil ; Discharge ; Fluvial hydrology ; Observation network ; Remote sensing ; Sediment budget ; Sediment transport ; Stream ; Suspended load
  • This study addresses the quantification of the Amazon River sediment budget which has been assessed by looking at data from a suspended sediment discharge monitoring network and remote sensing estimates derived from MODIS spaceborne sensor. Both
  • field and satellite-derived estimates of the sediment concentration of the Amazon River are combined to get an uninterrupted monthly average suspended sediment discharge from 1995 to 2007. Unlike the water discharge which exhibits a steady trend over
  • the same period at Óbidos (Brazil), the suspended sediment discharge increases since 1995.
  • 2009
  • Asian part of Russia ; Hydrochemistry ; Lena ; Nitrate ; Organic materials ; Phosphate ; Sakha ; Siberia ; Solution load ; Stream ; Suspended load
  • 2009
  • Agricultural land use ; Agricultural practice ; England and Wales ; Model ; Sediment budget ; Soil erosion ; Suspended load ; United Kingdom ; Water quality ; Watershed
  • The work reported in this contribution used a novel modelling framework to assess the impact of projected change in farming by 2015 on the relative input of the agricultural sector to the total suspended sediment load delivered to all rivers across
  • England and Wales. It required national scale sediment source apportionment to assess the current contributions of diffuse agricultural and urban sector losses, channel bank erosion and point source discharges to the total suspended sediment loads
  • 2009
  • Suspended and solute transport in a small glaciated catchment, Bertram River, Central Spitsbergen, in 2005-2006
  • Arctic Region ; Fluvioglacial features ; Foehn ; Hydrochemistry ; Meltwater ; Periglacial features ; Polar region ; Solution load ; Spitsbergen ; Suspended load ; Svalbard ; Watershed ; Wind
  • This paper presents data on hydrochemistry and suspended sediment dynamics from a small glaciated catchment in Svalbard. Bertram River is distinguished by a system of waterfalls which divides the catchment in 2 parts : an upper glaciated part
  • 2009
  • Land use ; Model ; Reforestation ; Sediment budget ; Slope gradient ; Slovenia ; Soil erosion ; Spatial distribution ; Suspended load ; Watershed
  • -catchments Rokawa and Upper Dragonja did not reforest in the same way, the sediment yield response is different as well. The sources of fine sediment were determined by analysing the hysteresis of the discharge waves, and the suspended sediment texture
  • . The sediment that leaves the catchment originates from 3 sources : hillslopes, erosional bedrock banks and sedimentary riverbanks. The analysis of the suspended sediment texture suggests that during a discharge wave the suspended sediment originates
  • predominantly from the hillslopes. The sedimentary riverbanks are not an important source of suspended sediment.
  • 2009
  • Suspended sediment transport and deposition over a dune : Río Paraná, Argentina
  • Argentina ; Chaco ; Dune ; Grain size distribution ; Model ; Sand ; Sediment transport ; Suspended load ; Watershed
  • Field data from the Rio Paraná, Argentina, are used to examine patterns of suspended sediment transport over a sand dune. Measurements of three-dimensional velocity are made with an acoustic Doppler current profiler whilst suspended sediment
  • 2009
  • Alps (The) ; Applied hydrology ; Data ; Erosion rate ; Europe ; Italy ; Reliability ; Sediment budget ; Solution load ; Suspended load ; Watershed ; Yougoslavia
  • The current denudation rate over an catchment area, encompassing the southern watershed of the Alps, the eastern watershed of the Northern Apennine and part of the Dinarides, was evaluated by means of a wide-reaching appraisal of the suspended load
  • 2009
  • Retrieval of suspended sediment concentrations in large turbid rivers using Landsat ETM+ : an example from the Yangtze River, China
  • China ; LANDSAT ; Remote sensing ; Spatial distribution ; Stream ; Suspended load ; Turbidity ; Yangtze
  • Suspended sediment concentration (SSC) is a critical parameter in the study of river sediment transport and water quality variation. This paper is focused on presenting a methodology that may be useful in estimating SSC which is of key importance
  • 2009
  • Diffusion ; Fluvial hydrology ; Heavy metals ; Polluted water ; Suspended load ; Waste
  • 2009
  • The aim of this study was to quantify suspended sediment loading from different landscape components of Ward and Blackwood Creeks on granitic and meta-sedimentary terrain as a means of identifying and ranking dominant erosional processes. This paper
  • . Analysis of sediment loading patterns during high and low flow events indicates that main channel-low gradient reaches act as temporary storage for fine sediment; storing during lower flows and releasing during higher flows.
  • 2009
  • Erosion rate ; Geochemistry ; Isotope analysis ; Isotope dating ; Meltwater ; Norway ; Sandur ; Strontium ; Suspended load ; Watershed
  • The AA. analysed samples of suspended sediment in stream water (i.e. runoff) for Sr-isotope ratios from 4 locations in the Erdalen area of the Oppstryn drainage basin. The Oppstryn area is located downstream of Erdalsbreen and Vetledalsbreen (Erdal
  • and Vetledal Glaciers), which are branches of Jostedalsbreen, the largest plateau glacier in northern Europe. The highest value was measured in a sample of suspended sediment particles from the glacial lake located below Erdalsbreen, and the lowest value
  • 2009
  • British Columbia ; Canada ; Flocculation ; Glacial lake ; Lacustrine sediment ; Lake ; Sedimentology ; Suspended load
  • 2009
  • In this paper, the results produced by simulations using a mechanistic model of sediment transport by rain-impacted flow are used to illustrate how sediment transport by suspended load, raindrop induced saltation and flow driven saltation may
  • 2009
  • Cameroon ; Climatic variability ; Discharge ; Drought ; Sediment transport ; Stream ; Stream flow ; Suspended load
  • 2009
  • with field data. The AA. utilized flow and sediment concentration data from 13 gauging stations in and around the bypas system to assess the impact of a single, large flood on suspended load transport to and storage within flood bypasses. They then focus
  • 2009