Sedimenttransport in a proglacial valley, Sermilik, East Greenland
Climatic variation ; Cold area ; Glacial features ; Greenland ; Hydrology ; Model ; Sedimenttransport ; Valley
Glaciaire ; Groenland ; Hydrologie ; Modèle ; Transport sédimentaire ; Vallée ; Variation climatique ; Zone froide
Detailed investigations of sedimenttransport have been carried out in a proglacial valley at the Mitdluagkat Glacier in East Greenland. The results from 1989, 1990 and 1991 have been compared with earlier measurements of sedimenttransport
. The hydrologic regime will be described and the effect of the development of an icing on the fluvial transport will be discussed.
Sustained storage and transport of hydraulic gold mining sediment in the Bear River, California
California ; Catchment area;Watershed ; Fluvial processes ; Gold ; Human impact ; Mining activity ; Model ; Pollution ; Sedimenttransport ; United States
Action anthropique ; Bassin-versant ; California ; Etats-Unis ; Exploitation minière ; Fluviatile ; Modèle ; Or ; Pollution ; Transport sédimentaire
This study examines the large deposits of hydraulic gold mining sediment and reevaluates Gilbert's (1917) classic model of sedimenttransport in a symmetrical wave that is based on hydraulic mining sediment primarily in the Yuba Basin. Sustained
storage and transport of hydraulic mining sediment in the Bear Basin are documented and a revised model of sedimenttransport is proposed.
This paper focuses on hillslope runoff and sedimenttransport within 2 catchments in southeast Spain. 5 monitoring sites were established on hillslope concavities throughout the 2 catchments. The techniques used were mini-crest stage recorders
, spray-painted lines, sediment traps and tipping bucket rain gauges. Sedimenttransport and depth of runoff varied dramatically with lithology; marl sites produced most runoff and sedimenttransport.
Charge en suspension ; Cours d'eau ; Erosion fluviatile ; Pays-Bas ; Plaine d'inondation ; Rhin ; Transport sédimentaire ; Variation climatique
The aim of this study was to assess the impact of climatic change on sedimenttransport in the river Rhine, and on the deposition of suspended sediment on the embanked floodplains in the Netherlands. - (AGD)
Ecoulement ; Erosion des sols ; Expérimentation ; Pente de versant ; Précipitation ; Simulation de pluie ; Transport sédimentaire ; Versant
Discussion of the results of experiments using simulated rainfall. It is shown that, because film thickness increases, the direct impact of rainfall on sedimenttransport decreases with slope length.
Bilan sédimentaire ; Coulée boueuse ; Indonésie ; Jawa ; Lahar ; Merapi ; Précipitation ; Pyroclastique ; Stratigraphie ; Sédimentologie ; Transport sédimentaire ; Volcanisme
This paper aims to present and to discuss the results of investigations concerning sedimenttransportation and deposition by lahars including sediment concentration which varies widely over time and space on Merapi's slopes. The results indicate
that the sediment load fluctuates during lahar flow, further demonstrating that lahars are transient sediment-water flows with unsteady flow properties.
Bassin-versant ; Bilan d'érosion ; Capacité de charge ; Cours d'eau ; Danemark ; Erosion des sols ; Fluviatile ; Réseau de drainage ; Transport sédimentaire
The objectives of this paper are to quantify the sedimenttransport leading to the wetland area, to describe the areal variation of transport rates and sediment sources and to establish a sediment balance for the system. Only general remarks
on technical solutions of the sedimentation problem are included.
Treating the dynamics of sedimenttransport as two-dimensional on interrill-areas and as one-dimensional in rill sections, areally averaged sheet sedimenttransport (SST) equations are developed. The two-dimensional SST equation is averaged over
an individual interrill-area width and then along the interrill-area length to obtain local-scale areally averaged interrill-area sheet sedimenttransport equation (local-scale areal averaging). Similarly, the cross-sectional-averaged rill sedimenttransport
equation is averaged along an individual rill length to obtain local-scale areally averaged rill sedimenttransport equation.
Sedimenttransport processes in pool-riffle sequences
Carrying capacity ; Channel geometry ; England ; Flood ; Fluvial processes ; Grain size distribution ; Hydrodynamics ; Northumberland ; River bed ; Sedimenttransport ; Sedimentary structure ; Stream ; Threshold ; Tracer ; United Kingdom
Capacité de charge ; Cours d'eau ; Crue ; England ; Fluviatile ; Granulométrie ; Géométrie hydraulique ; Hydrodynamique ; Lit fluvial ; Northumberland ; Royaume-Uni ; Seuil ; Structure sédimentaire ; Traceur ; Transport sédimentaire
This paper reviews the published data for sedimenttransport in pool-riffle sequences which suggests that a velocity or shear stress reversal hypothesis does not explain all of the published evidence of sedimenttransport. This conclusion
is explored in more detail using obsevations of sedimenttransport from the regulated River North Tyne.
transported as bedload, a single erosion mechanism (abrasion) and sediment-starved transport conditions. They find that patterns of erosion both create and are sensitive functions of the evolving bed topography because of feedbacks between the turbulent flow
field, sedimenttransport and bottom roughness.
To explore the mechanisms of river incision, the AA. conducted laboratory experiments in which the complexities of natural bedrock channels were reduced to a homogenous brittle substrate (sand and cement), a single sediment size primarily
This paper synthesizes a variety of methods adopted in suspended sediment monitoring, estimation and modelling for understanding sedimenttransport processes and determining the suspended sediment load. Methods for sediment monitoring are described
in terms of direct and indirect approaches. Different approaches toward the establishment of a sediment rating curve are examine thoroughly. Techniques of sediment modelling are summarized via depiction of various hydrological and sediment models
at the watershed scale. The paper ends with the discussion of future developments in suspended sediment studies at the watershed scale.
Sediment storage and yield in an urbanized karst watershed
Cave ; Doline ; Karst ; Sediment budget ; Sedimenttransport ; Tennessee ; United States of America ; Urban area ; Watershed
Bassin-versant ; Bilan sédimentaire ; Doline ; Espace urbain ; Etats-Unis ; Grotte ; Karst ; Tennessee ; Transport sédimentaire
objectives : to investigate the function (source or sink) of sinkholes with respect to sedimenttransport; to demonstrate how sinkhole sedimentation rates can be used as an indicator of basin sediment yield from some sinkhole drainage basins; and to determine
This paper presents a preliminary assessment of fluvial sediment storage and yield in an urbanized, karst watershed. The AA. aim to identify and quantify the function of caves and sinkholes within the context of a sediment budget with 3 specific
the relative contribution of a major cave system to a preliminary sediment budget for a karst watershed.
Sedimenttransport across a tidal divide in the Danish Wadden Sea
Coastal environment ; Denmark ; Estuary ; Hydrodynamics ; Model ; North Sea ; Sedimenttransport ; Spatial variation ; Suspended load ; Tidal current ; Tide
Charge en suspension ; Courant de marée ; Danemark ; Estuaire ; Hydrodynamique ; Littoral ; Marée ; Mer du Nord ; Modèle ; Transport sédimentaire ; Variation spatiale ; Waddenzee
The aim of this study is to examine the spatial and temporal variation of water and sedimenttransport across a tidal divide in the Danish Wadden Sea. This is exemplified by 2 low-energy and 2 high-energy case studies selected from a 2-month
observation period. The sedimenttransport includes measured suspended transport and calculated sand transport.
Determination of the sedimenttransport in an armoured gravel-bed river
Sedimenttransport dynamics. Special issue
Carrying capacity ; Comparative study ; Discharge ; Europe ; Geographical information system ; Gravel ; Methodology ; Meuse ; Sediment load ; Sedimenttransport ; Stream
Capacité de charge ; Charge solide ; Cours d'eau ; Débit ; Etude comparée ; Europe ; Gravier ; Meuse ; Méthodologie ; Système d'information géographique ; Transport sédimentaire
For 3 periods of 9, 8 and 17 years sedimenttransport computations are made with 2 series of relationships between sedimenttransport (Qb) and discharge (Q) in which the condition of the armour layer is taken into account. These sediment-transport
-discharge (Qb/Q) relationships are determined by local bed-load transport in the Common Meuse. The survey data in the Common Meuse were analysed with a geographical information system (GIS) (ARC-INFO) to produce maps of the river-bed level. The subtraction
of maps of bed levels in different years results in a map with spatial distributions of erosion and sedimentation.
Sedimenttransport rate-based model for rainfall-induced soil erosion
Experimentation ; Mathematical model ; Model ; Overland flow ; Precipitation ; Rainfall simulation ; Sedimenttransport ; Soil erosion ; Water erosion
Ecoulement superficiel ; Erosion des sols ; Erosion hydrique ; Expérimentation ; Modèle ; Modèle mathématique ; Précipitation ; Simulation de pluie ; Transport sédimentaire
A one-dimensional mathematical model, termed sedimenttransport rate-based model, is developed for determining rainfall-induced soil erosion and sedimenttransport. A series of soil flume experiments under simulated rainfall were conducted
to simulate the overland flow and sedimenttransport and to test the sedimenttransport rate-based model. The numerically simulated hydrographs, sedimenttransport rate and concentration distributions are in good agreement with those measured in laboratory
experiments, demonstrating the efficacy of the transport rate-based model.
The influence of microform bed roughness elements on flow and sedimenttransport in gravel bed rivers : a reply
Carrying capacity ; Flood ; Flow ; Fluvial hydrology ; Fluvial processes ; River bed ; Sedimenttransport ; Turbulence
Capacité de charge ; Crue ; Ecoulement ; Fluviatile ; Hydrologie fluviale ; Lit fluvial ; Transport sédimentaire ; Turbulence
The inference that flow and form are dynamically linked is in sympathy with the own conclusions of the AA. that cluster spacing is an equilibrium condition governed by the interplay of flow resistance and sedimenttransport.