Sediment slugs: large-scale fluctuations in fluvial sedimenttransport rates and storage volumes
Carrying capacity ; Fluvial processes ; Human impact ; Land use ; Model ; Sediment budget ; Sedimenttransport ; Sedimentary structure ; Watershed
Action anthropique ; Bassin-versant ; Bilan sédimentaire ; Capacité de charge ; Fluviatile ; Modèle ; Structure sédimentaire ; Transport sédimentaire ; Utilisation du sol
This article presents a brief review of the origins and types of large-scale spatial and temporal fluctuations in sedimenttransport phenomena. The potential for using current modelling approaches to quantify the mechanisms controlling
The AA. report observations of the magnitude, processes, and effects of fluvial sedimenttransport and deposition on the Pasig-Potrero River alluvial fan 6 years after the cataclysmic eruption of Mount Pinatubo. This analysis shows bedload transport
in volcanically disturbed rivers reflects higher transport capacities than in their nondisturbed counterparts, and that arid zone channels provide a better analog for predicting post-eruption bedload transport due to their high transport efficiency.
Dating ; Holocene ; Isotope analysis ; Lacustrine sedimentation ; Paleogeography ; Paleomagnetism ; Quaternary ; Sedimenttransport ; United Kingdom ; Wales
Estimates of suspended sediment yield over the past 800 years have been derived from a whole-basin study of lake sediments in Llyn Geirionydd, North Wales. Magnetic and physical sediment properties were used to correlate a suite of cores to a master
chronology based on 210Pb and 14C dates. The sources of sediment within the catchment were identified by comparing the magnetic and heavy metal properties of sediments, soils, and stream sediments.
Belgique ; Erosion des sols ; Granulométrie ; Précipitation ; Ruissellement ; Transport sédimentaire ; Versant
Experiments were carried out in order to measure the sedimenttransport capacity of interrill flow with and without rainfall and to relate the transport capacity to selected hydraulic parameters, such as effective stream power and shear velocity
. Different sediments were used in order to study the effect of grain size. The proposed relationship show considerable variations with grain size and there is only a minor effect of rainfall on the transport capacity which also seems to be grain size
Sedimenttransport under different types of vegetation in Sediment sources, sediment residence time and sediment transfer-Case studies of soil erosion in the Lesotho lowlands.
Couvert végétal ; Erosion des sols ; Géographie de l'Afrique ; Lesotho ; Taux d'érosion ; Transport sédimentaire
The standard conditions of erosion rates (on albaqualps respective argiudolls soils) is considered to be described by two areas with undisturbed grass cover. Measured sediment concentration in runoff from these were compared with two study areas
Analysis of bedload transport characteristics of Idaho streams and rivers
Carrying capacity ; Grain size distribution ; Idaho ; Model ; Mountain ; Sediment load ; Sedimenttransport ; Stream ; United States of America
Capacité de charge ; Charge solide ; Cours d'eau ; Etats-Unis ; Granulométrie ; Idaho ; Modèle ; Montagne ; Transport sédimentaire
Data collected for 33 sites on 31 mountain streams and rivers in Central Idaho have enabled the analysis of sedimenttransport characteristics in streams and rivers with different geological, topographic, morphological, hydrological, hydraulic
, and sedimentological characteristics. The particle size distributions of bedload and bed material, watershed and in-stream characteristics, sedimenttransport patterns and bedload transport rates are considered in this paper. The obtained results and conclusions
are used to identify different influences on bedload transport rates in analyzed gravel-bed rivers.
Erosion des sols ; Erosion hydrique ; Granulométrie ; Précipitation ; Ruissellement ; Simulation de pluie ; Transport sédimentaire ; Versant
for such flow in terms of transport distance (i.e. a finite distance in a finite time) will be presented. Using the data obtained from the investigation, a predictive equation for sediment-transport competence of rain-impacted shallow flow will be developed.
This paper investigates the transport of particles in shallow, rain-impacted flow. Specifically the relationships among rainfall energy, flow energy and transport distance will be investigated. From this investigation a definition of competence
Alpes ; Analyse de régression ; Bilan sédimentaire ; Charge en suspension ; Débit ; Eau de fonte ; Erosion glaciaire ; Glacier ; Suisse ; Transport sédimentaire ; Variation saisonnière
Proglacial suspended sedimenttransport was monitored at Haut Glacier d'Arolla, during the 1998 melt season to investigate the mechanisms of basal sediment evacuation by subglacial meltwater. The AA. use regression analyses to rigorously constrain
relationships between proglacial suspended sedimenttransport and discharge. The results are discussed in relation to contemporaneous changes in both glacier motion and hydraulics of the subglacial drainage system, to elucidate the mechanisms of basal sediment
The fate of eroded soil: sediment sinks and sediment budgets of agrarian landscapes in southern Minnesota, 1851-1988
Flood ; Floodplain ; Minnesota ; Palaeosol ; Sediment budget ; Sedimenttransport ; Soil erosion ; United States ; Watershed
Bassin-versant ; Bilan sédimentaire ; Crue ; Erosion des sols ; Etats-Unis ; Minnesota ; Paléosol ; Plaine d'inondation ; Transport sédimentaire
This paper examines the fate of eroded soil by tracing the distribution of eroded sediment and constructing the sediment budgets of three medium-size drainage basins in southern Minnesota. This research attempts to improve our understanding
of sediment sinks and flux, of the dynamic resources of drainage basins, and of what has been called the sediment delivery problem.
The spatial variability of overbank sedimentation on river floodplains
Analyse isotopique ; Cours d'eau ; England ; Granulométrie ; Géochimie ; Microrelief ; Plaine d'inondation ; Royaume-Uni ; Sédimentation ; Transport sédimentaire ; Variation spatiale
England ; Floodplain ; Geochemistry ; Grain size distribution ; Isotope analysis ; Microrelief ; Sedimenttransport ; Sedimentation ; Spatial variation ; Stream ; United Kingdom
The study reported uses Cs 137 measurements on sediment cores to investigate the spatial variability of sediment deposition on selected floodplain reaches of five British lowland rivers. Attention is given both to the overall reach and to more
detailed investigations of small areas. The observed spatial patterns of sediment deposition are interpreted in terms of the major controls involved, which include the floodplain microtopography and morphology. The relationship between the grain size
composition of deposited sediment and sedimentation rate is also considered.
Alpes ; Capacité de charge ; Charge solide ; Cours d'eau ; Détecteur piézoélectrique ; Méthodologie ; Suisse ; Transport sédimentaire
The AA. report on bedload transport observations using piezoelectric bedload impact sensors (PBIS), an indirect method of estimating the volume of bedload transport of coarse sediment. Sedimenttransport at the Erlenbach stream has been continuously
water discharge, and the critical discharge for the onset of sedimenttransport.
monitored with a PBIS array starting in 1986. Sediment volumes for individual flood events estimated with the PBIS method are in agreement with volumes estimated using an independent empirical method based on the effective runoff volume of water, the peak
Action anthropique ; Bassin-versant ; Dynamique de versant ; Granulométrie ; Honshu ; Ibaraki ; Japon ; Matière en suspension ; Montagne ; Précipitation ; Ruissellement ; Transport sédimentaire ; Versant
The purpose of the study is to clarify the discharge process of suspended sediment and the mechanism of suspended sediment dynamics in a mountain catchment by analyzing the time changes of suspended sediment concentration and the discharge patterns
Researches on environmental changes of the Yellow River Basin and laws of water and sedimenttransportation
Aménagement hydraulique ; Bassin-versant ; Bilan sédimentaire ; Capacité de charge ; Chine ; Cours d'eau ; Huanghe ; Hydrologie fluviale ; Sédimentation ; Transport sédimentaire
Carrying capacity ; China ; Fluvial hydrology ; Huang He ; Hydraulic works ; Sediment budget ; Sedimenttransport ; Sedimentation ; Stream ; Watershed
In this project, some basic researches on the prospect of reducing sediments delivered into the Yellow River after 2000, the ways to prolonging the lifetime of the current lower Yellow River channel, the program of comprehensive management
Secondary airflow and sedimenttransport in the lee of a reversing dune
Aeolian features ; Dune ; Grain size distribution ; Nevada ; Sedimenttransport ; Slope exposure ; Spatial variation ; United States of America ; Wind speed
Dune ; Eolien ; Etats-Unis ; Exposition de versant ; Granulométrie ; Nevada ; Transport sédimentaire ; Variation spatiale ; Vitesse du vent
Lee-side windspeed and sedimenttransport were measured over a small transverse ridge in the Silver Peak dunefield, west-central Nevada, using an intensive array of 25 cup anemometers and 7 total flux traps. From these results, implications
for the mode, direction and relative amount of lee-side sedimenttransport under crest-transverse flow conditions are discussed.
Impacts of flow diversion for small hydroelectric power plants on sedimenttransport, Northwest Washington
Ecosystem ; Fish ; Fluvial dynamics ; Grain size distribution ; Habitat ; Hydraulic works ; Hydro-electric station ; Impact ; River diversion ; Sedimenttransport ; United States of America ; Washington State
Aménagement hydraulique ; Centrale hydraulique ; Dynamique fluviale ; Dérivation de cours d'eau ; Ecosystème ; Etats-Unis ; Granulométrie ; Habitat ; Impact ; Poisson ; Transport sédimentaire ; Washington State
This study examines the effects of a small hydroelectric power plant on sedimenttransport. The primary objective was to assess the present (post-construction) characteristics of the affected streams and to compare them with the conditions before
construction. This allows to assess the degree to which operation of the project has changed sedimenttransport and fish-habitat conditions.
Changes in the hydrology and sedimenttransport produced by large dams on the lower Ebro river and its estuary
Ebro ; Estuary ; Fluvial hydrology ; Hydraulic works ; Seasonal variation ; Sedimenttransport ; Spain ; Stream ; Tarragona ; Water use
Aménagement hydraulique ; Cours d'eau ; Ebro ; Espagne ; Estuaire ; Hydrologie fluviale ; Tarragona ; Transport sédimentaire ; Utilisation de l'eau ; Variation saisonnière
The aim of this paper is to analyse the changes in the hydrology and sedimenttransport in the lower Ebro river and its estuary as a consequence of dam construction and increased water uses in the basin. Changes at different time-scales
are specifically considered : long-term changes (years to decades), seasonal changes and daily changes. A critical analysis of the existing data on sedimenttransport in the present century is also presented.
Dynamique littorale ; Littoral ; Pays-Bas ; Transport sédimentaire ; Zone intertidale
The hydrodynamics and the suspended sediment fluxes are studied in detail at the crest and on the seaward slope of a swash bar on the intertidal beach. The small scale morphological behaviour of the beach and the meso scale morphological behaviour
Streamflow and sedimenttransport from mountain watersheds of the Chao Phraya basin, northern Thailand : a reconnaissance study
Catchment area;Watershed ; Hydrology ; Land use ; Mountain ; Rill wash;Runoff ; Sedimenttransport ; Thailand
Bassin-versant ; Hydrologie ; Montagne ; Ruissellement ; Thaïlande ; Transport sédimentaire ; Utilisation du sol
The A. disputes the hypothesis that land-use practices have altered the hydrologic regime of these basins or have contributed to an increased sediment load in the rivers. - (DWG)
maps of sediment accumulation were made by interpolating the measurements from the traps using block kriging. The observed patterns of sediment accumulation are related to floodplain topography and possible sedimenttransporting mechanisms.
This paper presents the results of measurements of floodplain sedimentation using sediment traps. The study was carried out on two embanked floodplains along the Rivers Rhine and Meuse in the Netherlands during a 3 day flood in january 1993. Raster