This paper reports the results of a study that examined the budgets of suspended sediment in a basin, to clarify the effects of channelization on sediment budgets and river morphology, and to estimate the vegetational changes that occurred
The impact of weather patterns on historic and contemporary catchment sediment yields
Bassin-versant ; Bilan sédimentaire ; Changement global ; Circulation atmosphérique ; Cyclone ; England ; Erosion des sols ; Lac ; Précipitation ; Royaume-Uni ; Sédiment lacustre ; Type de temps ; Utilisation du sol ; Variation climatique
Atmospheric circulation ; Climatic variation ; Cyclone ; England ; Global change ; Lacustrine sediment ; Lake ; Land use ; Precipitation ; Sediment budget ; Soil erosion ; United Kingdom ; Watershed ; Weather type
Lake sediment-based estimates of sediment yield have frequently been used to reconstruct changing patterns of sediment supply arising from environmental change. Such analyses have often emphasized the importance of anthropogenic factors. This paper
examines several U.K. sediment yield chronologies within the context of mesoscale atmospheric circulation patterns. Changes in the frequency of the winter cyclonic Lamb weather type since 1861 were found to account for a significant proportion
of the variation in sediment yields. The results also have implications given the potential geomorphological consequences of global climate change.
The aim of this study was to assess the impact of climatic change on sediment transport in the river Rhine, and on the deposition of suspended sediment on the embanked floodplains in the Netherlands. - (AGD)
Discharge and sediment concentration were monitored at 2 dams, as well as gully erosion at 4 locations during 1988-1989 in the Shenchong experimental basin, located in subtropical Deqing County, Guangdong Province. Specifically, the objectives
of this study are : 1) to investigate the patterns of sediment transport and sediment sources in the research basin by considering the sediment concentration and discharge relationship ; 2) to assess the significance of gully erosion as a contributor to basin
sediment load by relating the basin response data to information obtained from the gullies in the basin.
Distributed evaluation of the contribution of soil erosion to the sediment yield from a watershed
Drainage network ; Numerical model ; Sediment budget ; Sediment transport ; Soil erosion ; Suspended load ; Watershed
Due to the highly episodic nature of sediment supply and transport in many environments and to the extreme complexity of the processes involved, the evaluation of the sediment load in a river is still highly uncertain. The AA. propose a distributed
Alluvium ; Carrying capacity ; Channel geometry ; Flood ; Floodplain ; Fluvial processes ; Meander ; Model ; Multivariate analysis ; Sedimentation ; Stream flow ; Terrace ; United States of America ; Wisconsin
This paper examines the processes that influence spatial patterns of historical floodplain sedimentation and the implications for the evolution of floodplains in the Blue River watershed, Wisconsin. The storage of historical overbank sediments
River-derived slackwater sediments in caves along Cheat River, West Virginia
Bassin-versant ; Canyon ; Crue ; Débit de pointe ; Etats-Unis ; Grotte ; Indicateur ; Plaine d'inondation ; Stratigraphie ; Sédimentation ; Vase ; West Virginia
Canyon ; Cave ; Flood ; Floodplain ; Indicator ; Pic discharge ; Sedimentation ; Silt ; Stratigraphy ; United States of America ; Watershed ; West Virginia
This paper describes flood-derived sediments found within caves of the Cheat River canyon. The stratigraphy of historical and paleoflood slackwater sediments, sedimentary units within slackwater deposits, and the origins are discussed and compared
Late Holocene sedimentation in Saanich inlet, British Columbia, and its paleoseismic implications
Analyse isotopique ; British Columbia ; Canada ; Datation C 14 ; Fjord ; Holocène ; Paléogéographie ; Préhistoire ; Sédimentation ; Séisme
British Columbia ; C 14 dating ; Canada ; Earthquake ; Fjord ; Holocene ; Isotope analysis ; Palaeogeography ; Prehistory ; Sedimentation
Etude de 8 carottes de sédiments s'échelonnant sur les derniers 1500 ans, prélevées dans le bras de mer Saanich, un fjord anoxique de l'île de vancouver, afin d'obtenir des données sur la sédimentation et l'activité de tremblements de terre
This paper reviews the basis for using fallout Cs 137 measurements of floodplain sediment samples to study rates and patterns of overbank sediment deposition on floodplains. The processes involved in the incorporation of Cs 137 into overbank
floodplain sediments will be discussed, and the primary factors influencing the distribution of Cs 137 in the sediment will be examined. The results obtained from a case study of a floodplain reach of the River Stour, Dorset, UK, will be used to illustrate
the procedures and to demonstrate their utility and potential in floodplain sedimentation investigations.
Source identification of suspended sediment from grain-size distributions : I. application of nonparametric statistical tests
In this study, a new technique for identifying the source of suspended sediment is described, based on a comparison of overall grain-size distributions. Suspended sediment flux (SSF) supplied from sediment generated by logging and deposited
on hillslopes, and that from unpaved road surface, were obtained in the Hiyamizusawa Brook basin, Hokkaido. The ratio between SSF from deposited sediment fines (DSF) and that from suspended sediment in the road surface flow (SSR), i.e. the ratio DSF:SSR
, was estimated from grain-size distributions of the river-suspended sediment based on nonparametric statistical tests.
L'objet de cet article est l'étude de l'interactivité entre les courants et la sédimentation dans les ports ouverts. Une méthode, fondée sur la télédétection, a été élaborée pour mesurer les courants. La taille des sédiments et la proportion de
minéraux ne diffèrent pas seulement d'une région à l'autre mais sont également différents à l'intérieur d'une région. Cette étude met en évidence les points importants de sédimentation dans les ports et montre comment les frais d'entretien pourraient être
Dating ; Lacustrine sediment ; Nevada ; Palaeomagnetism ; Pleistocene ; Quaternary ; Stratigraphy ; Tephrochronology ; United States of America
A comparison of paleomagnetic secular variation in sediment of Pleistocene Lake lahontan in the northwestern Great basin with secular variation in lake sediment in the Mono Basin, California, indicates that Lake Lahontan was in the valley
of the Truckee River between Pyramid Lake and Wadsworth, Nevada, from about 19,000 to 13,000 yr B.P. On the basis of field mapping and tephrochronology, the sections of older lacustrine sediments are not coeval. The apparent, but erroneous, correlation of those
sediments emphasizes the need for multiple dating methods when paleomagnetic secular variation is used to date stratigraphy.
Temporal and spatial representativeness of alpine sediment yields: Cascade Mountains, British Columbia
Bathymétrie ; Bilan sédimentaire ; British Columbia ; Canada ; Cirque glaciaire ; Holocène ; Lac glaciaire ; Montagne ; Paléoclimat ; Pente de versant ; Sédimentation lacustre ; Sédimentologie
Bathymetry ; British Columbia ; Canada ; Cirque ; Glacial lake ; Holocene ; Lacustrine sedimentation ; Mountain ; Palaeoclimate ; Sediment budget ; Sedimentology ; Slope gradient
New alpine, lake-based sediment yield data are presented from a cirque basin in the alpine zone of the Cascade Mountains, British Columbia. Lithology, relief and climate are major controls on sediment yield. Slope frequency data suggest the site
is representative of the cirque component of the landscape but not of the whole alpine zone. The results emphasize the importance of considering the spatial variability of relief and the temporal variability of climate in assessing the representativeness of sediment
The provenance of beach sediments on Rhodes, southeastern Greece, indicated by sediment texture, composition and roundness
Beach ; Coastal dynamics ; Coastal environment ; Grain size distribution ; Greece ; Island ; Mineralogy ; Sediment transport ; Sedimentology ; Wave ; Wind
or predominant waves, as key areas for study of the transport and provenance of the beach sediments. The texture, composition, provenance, and transport of beach sediments and the roundness of sediment grains were studied with the purpose to throw light upon
European impacts on downstream sediment transfer and bank erosion in Cobargo catchment, New South Wales, Australia
Australia ; Bank erosion ; Channel geometry ; Fluvial processes ; Granite ; Human impact ; Landscape ; Meander ; New South Wales ; Sediment budget ; Sediment transport ; Watershed
-catchment linkage of geomorphic processes associated with upland sediment release, mid-catchment sediment transfer, and sediment accumulation in the lowland zone, has produced a predictable downstream pattern in the distribution of bank erosion.
The major link between geomorphology and basin analysis is the sediment flux from catchment to basin. It is the various controls (lithological, morphological, climatic and botanical) upon the magnitude of sediment flux that link the 2 subjects
. These variables require the total sediment flux to be integrated over the whole range of the catchment, particularly when evaluating the effects of climate change. Contrasting trends in sediment discharge reflect both the nature of climate and vegetation change
Magnitude and variation in the contribution of bank erosion to the suspended sediment load of the River Severn, UK
Annual variation ; Bank erosion ; Flood ; Great Britain ; Model ; Sediment budget ; Spatial variation ; Stream ; Suspended load ; Turbulence ; United Kingdom
This paper investigates the relatonship between bank erosion and suspended sediment dynamics at the annual, monthly and event timescales within the upper River Severn. Manual erosion pins and photo-electronic erosion pins were used to estimate bank
erosion, and turbidity meters were used to determine suspended sediment transport. This research highlighted that for an upland catchment, bank erosion was an important supply of suspended sediment, and that for some flood events bank erosion can supply
Etude des sédiments glaciolacustres et de l'évolution néoglaciaire du bassin de Chephren lake, Parc national de Banff, Alberta. Les données sur les sédiments de fond et la morphologie lacustre montrent que les sédiments en suspension de la partie
L'A. étudie la structure de l'hydrosphère dans la zone arctique de l'hémisphère Nord et de la partie sous-marine de la lithosphère en corrélation avec elle. Il montre l'état de l'eau dans les sédiments du fond selon leur température, le degré de
salinité, l'histoire de la formation. Il met en évidence les particularités de l'alimentation de l'océan Arctique en matériel sédimentaire et la spécificité logique de la manifestation du processus de sédimentation dans l'océan et les mers arctiques.
In this study, erosion and sediment characteristics were measured in simulated rainfall experiments for 3 forest soils of contrasting physical properties. 4 erosion treatments combined varying slope and kinetic energy of rainfall to provide 3
effective levels of energy from rain and runoff. A comparison of soil loss and size-distribution (quantified as Mean Weight Diameter, MWD) of the uneroded soils with size-distribution of sediment indicated soil loss to be greatest and sediment finest