The objectives of this paper are to quantify the sediment transport 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.
Fluvial sediment budgets in the North Carolina Piedmont
Catchment area;Watershed ; Fluvial processes ; North Carolina ; Pollution ; Sediment budget ; Soil erosion ; United States
The purpose of this study is to estimate and examine rudimentary sediments budgets for four river basins in the Piedmont physiographic province of North Carolina to determine the relative magnitude and importance of sediment storage.
Absence of caesium-137 from recent sediments in eastern Australia. Indications of catchment processes?
Here the AA. report on a reconnaissance survey of the 137Cs content of recent alluvial sediments in the Hunter valley, N.S.W., Australia. They attribute the absence of 137Cs from recent sediments, in part, to the nature and magnitude
of the catchment processes associated with the entrainment and subsequent deposition of the sediments.
Upland and coastal sediment sources in a Chesapeake Bay estuary
Action anthropique ; Baie ; Chesapeake ; Cours d'eau ; Erosion littorale ; Estuaire ; Etats-Unis ; Fluviatile ; Gestion de l'environnement ; Gestion des ressources ; Littoral ; Maryland ; Palynologie ; Sédimentation ; Sédimentologie
Bay ; Chesapeake ; Coastal environment ; Coastal erosion ; Environment management ; Estuary ; Fluvial processes ; Human impact ; Maryland ; Palynology ; Resource management ; Sedimentation ; Sedimentology ; Stream ; United States
New data from the South River, Maryland and reexamination of existing literature suggest that coastal erosion may be the dominant process driving sediment inputs along the lenght of many tributary estuaries of the Chesapeake. This paper addresses
those issues by developing a sediment budget for the upper South River and examining resource management implications of that budget.
Quartz concentration as an index of sediment mixing : hydraulic mine-tailings in the Sierra Nevada, California
Hydraulic gold mining delivered large volumes of sediment to northern California stream channels from 1853 to 1884. Distinctive quartz composition of this sediment allow development of a sediment mixing index for determination of tailings
concentrations in contemporaneous and reworked deposits. This index reveals patterns of sediment mixing in the Bear River, California over the last 100 years.
Description des objectifs et de l'instrumentation utilisée pour la mesure de la puissance des sédiments en eau profonde par la méthode des mesures de sismiques réflexions.―(MC)
Land use, geology and topography account for the differences in sedimentation and flooding in four watersheds in densely settled Ruhengeri prefecture.―(DWG)
Discussion of the results of experiments using simulated rainfall. It is shown that, because film thickness increases, the direct impact of rainfall on sediment transport decreases with slope length.
Formation of stationary alternate bars in a steep channel with mixed-size sediment : a flume experiment
Alternate bars were formed by sediment transport in a flume with Froude-modelled flow and relative roughness characteristic of gravel-boulder channels with steep slopes. This paper describes the experiment and present arguments that steep channel
gradients and widely graded sediment enhance the stability of alternate bars.
Sediment yield and delivery in the blanket peat moorlands of the southern Pennines
This research attempts to add to the existing knowledge of peat-covered catchments by adopting investigations at various temporal and spatial scales to illuminate patterns of sediment erosion and sediment yield in peat-covered catchments.
Experiments were carried out in order to measure the sediment transport 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
Glacitectonic deformation in sediment and bedrock, Hat Creek, British Columbia
British Columbia ; Canada ; Cold areas ; Fault ; Glacial features ; Model ; Sediment filling ; Tectonics
Etude des structures de déformation attribuées au chevauchement glaciaire qui se manifestent dans la roche en place et les sédiments de la vallée intramontagnarde du Hat Creek, en Colombie-Britannique. Présentation d'un modèle de la formation
glacitectonique d'éjections hydrauliques durant la compression des sédiments sous-terrains non gelés partiellement saturés.
A small catchment has been monitored in the high Gallego river basin (Central Spanish Pyrenees). The results show the great importance of autumn and occasional summer rainstorms for the sediment output. Sediment transport is negligible in winter
and adds little to the total volume during spring. Moreover, during the snowmelt, sediments are finer than those produced by rainstorms due to the hydrologic conditions and the different sediment sources.
In the Central Sinai the Precambrian rocks of the crystalline basement are partly covered with fine-grained, marly sediments. The sediments indicate a periodic change between more fluvial, coarser horizons and more finegrained, eolian horizons which
have been accumulated under stillwater conditions. The present paper shall contribute to solve the differing opinions about the petrogenesis of the silty sediments including their provenance.
Holocene sediment production in Lillooet River basin, British Columbia : a sediment budget approach
British Columbia ; Canada ; Catchment area;Watershed ; Cold areas ; Glacial features ; Holocene ; Human impact ; Landslides ; Paleo-environment ; Sediment budget ; Volcanism
Etude, par le bilan sédimentaire, de la sédimentation au cours de l'Holocène dans le bassin de la Lillooet River, Colombie-Britannique. Mise en évidence des principaux facteurs qui influencent la sédimentation : les périodes de volcanisme, les
L'étude des carottes de sédiments recueillies à des profondeurs de 140 à 300 m sur la plate-forme de l'île Axel-Heiberg (82oN) renseigne sur la mise en place des sédiments sous une glace de mer pérenne. Mise en évidence de cinq faciès sédimentaires
et interprétation du processus de sédimentation à partir de la sédimentologie, de la palynologie et des foraminifères.
Bibliography ; Carrying capacity ; Fluvial processes ; Gravel ; Hydrodynamics ; River bed ; Sediment transport ; Sedimentology ; Turbulence
This progress report reviews the research into the processes of : 1) coarse surface layers; 2) armour versus pavement; 3) bed surface structure and sediment transport; 4) imbrication; 5) small- and medium-scale gravel bedforms; 6) gravel bedforms
Water and sediment yields into the Sutlej River from the High Himalaya
In this river system whose water is derived mainly from snowmelt, an analysis of nine years of hydrologic data shows little variation in runoff, but great variation in sediment yield, mostly as a result of soil erosion caused by human agency. - (DWG)