Floodplain sedimentation: quantities, patterns and processes
Flood ; Floodplain ; Fluvial deposit ; Fluvial processes ; Grain size distribution ; Meuse ; Netherlands (The) ; Rhine ; River bed ; Sediment transport ; Suspended load
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
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 sediment transporting mechanisms.
Researches on environmental changes of the Yellow River Basin and laws of water and sediment transportation
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 ; Sediment transport ; 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
Sediment slugs: large-scale fluctuations in fluvial sediment transport rates and storage volumes
Carrying capacity ; Fluvial processes ; Human impact ; Land use ; Model ; Sediment budget ; Sediment transport ; Sedimentary structure ; Watershed
This article presents a brief review of the origins and types of large-scale spatial and temporal fluctuations in sediment transport phenomena. The potential for using current modelling approaches to quantify the mechanisms controlling
Groenland ; Lac ; Lac proglaciaire ; Sédimentation lacustre ; Transport sédimentaire ; Varve ; Zone froide
Cold area ; Greenland ; Lacustrine sedimentation ; Lake ; Proglacial lake ; Sediment transport ; Varves
Three cores collected from a proglacial lake with an Axelsson corer are x-rayed. The stratification is interpreted as varves. The cores cover periods of sedimentation with a duration from 5-23 years. The average thickness of the varves vary from 1.9
-20.0 mm indicating a tenfold variation in the sedimentation rate.
Environmental impact assessment of the Pequenos Libombos dam in Southern Mozambique. An evaluation of methods for terrain analysis, sediment transport and reservoir sedimentation in an EIA framework
Dam ; Geographical information system ; Hydraulic works ; Impact ; LANDSAT ; Land use ; Mozambique ; Remote sensing ; SPOT ; Sediment budget ; Sediment transport ; Soil erosion ; Swaziland ; Water ; Water quality ; Water resources
, has been used as a case study to evaluate methods for terrain analysis, sediment transport and reservoir sedimentation in an EIA framework. The environmental impacts are discussed on site, at the reservoir and off site, downstream as well
This study was carried out to provide data on the spatial variability of runoff and sediment production on lithologically uniform hillsllopes which differ in aspect, slope and vegetation. Such data can be used to adjust forestry practices for more
Biostratigraphy ; C 14 dating ; Hungary ; Lacustrine sediment ; Methodology ; Palynology ; Quaternary ; Stratigraphy
Relying on several decades of research experience, ever more new methods and methodological approaches, the opportunities of the application of palynological analysis for shallow lake sediments are summarised. New findings are also mentioned
The effects of large organic debris on sediment processes and stream morphology in Vermont
Channel geometry ; Fluvial processes ; Longitudinal section ; New England ; River bed ; Sediment load ; United States of America
This study documents the role of LOD (large organic debris) in regulating downstream sedimentation and in creating channel variability in Vermont. Research on LOD in Vermont was designed to investigate processes documented in the Pacific Northwest
and elsewhere in order to compare and contrast previous results. This study investigates the influence of LOD on stream gradients, sediment storage and channel geometry.
Impacts of flow diversion for small hydroelectric power plants on sediment transport, Northwest Washington
Ecosystem ; Fish ; Fluvial dynamics ; Grain size distribution ; Habitat ; Hydraulic works ; Hydro-electric station ; Impact ; River diversion ; Sediment transport ; United States of America ; Washington State
This study examines the effects of a small hydroelectric power plant on sediment transport. 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 sediment transport and fish-habitat conditions.
Sediment-related river maintenance: the role of fluvial geomorphology
Bank erosion ; Carrying capacity ; Data base ; Derbyshire ; England ; Flood ; Floodplain ; Fluvial processes ; Geotechnics ; Hydraulic works ; Land use ; Leicestershire ; Sediment transport ; United Kingdom ; Water quality ; Watershed
This paper addresses the role that fluvial geomorphology might play in the management of sediment-related river maintenance in the U.K. A methodology for conducting a geomorphological survey, or fluvial audit, is presented, which synthesizes
historical data on the catchment land-use and channel network, with contemporary morphological maps to present a statement of the location and type of sediment supply, transport and storage within the river basin under scrutinity. Case studies from two
catchments are explored: the River Sence, a fine sediment system, and the Shelf Brook, a coarse sediment system.
Organic matter and nutrient concentrations in sediments are studied in three areas representing a depth profile from shallow to deep water in the transition zone between the Kattegat and the Baltic proper. The data suggest that the sediments have
a preferential loss of their N content compared to the C content during resuspension and transport from erosional bottoms to accumulation bottoms. This indicates that the C/N ratio may be used as an indicator of bottom type, provided that the sediments
lessivage de surface) et la charge moyenne en sédiments n'est pas en équilibre. Cette situation de déséquilibre pourrait conduire à une incision progressive du réseau de drainage, peut être renforcée par l'activité tectonique de la région.
In this study, the AA. analysed a series of aerial photographs, the age distribution of floodplain deposits and sedimentation data of reservoirs in order to understand sediment routing in mountain rivers. The main rivers investigated were the Saru
European part of Russia ; Geomorphogenesis ; Glacial features ; Glaciation ; Gulf of Finland ; Lithology ; Marine sediment ; Marine sedimentation ; Sedimentology
influencée par les principales formes du relief récentes dans la baie de Luga sur le golfe de Finlande (oblast de Saint-Pétersbourg). Les caractéristiques de la sédimentation actuelle sont déduites de la granulométrie des sédiments marins du fond.
Provenance of aeolian sediment: the upper Coachella Valley, California
The Nature Conservancy and the Coachella Valley Preserve System are concerned about maintaining an adequate sediment supply to the dune environments that urban growth might interrupt. Determining the source of the existing aeolian sediments
is a critical first step toward ensuring a perpetual sediment supply. Geochemical links between the aeolian sediment sources and the Coachella Valley Preserve dunes were discovered by mapping the aeolian sand distribution and analyzing trace elements using
Coastal current ; Coastal environment ; European part of Russia ; Kaliningrad ; Marine sedimentation ; Sediment transport
At the northern coast of the Sambian Peninsula longshore sediment drift proceeds in the form of short (up to 3-4 km) oppositely directed flows; zones of their divergence are located at the coastal protrusions (cusps), while the convergence takes
place in heads of bights. Several stable lithodynamic cells have been identified; exchange of energy and sediments between them is hampered. The sediment transport within each cell is effected by longshore energetic currents, rip currents developing
Aeolian sediment flux decay: non-linear behaviour on developing deflation lag surfaces
This study reports on a series of wind tunnel experiments in which rapid, detailed measurements of the sediment flux, wind profile and surface geometry were made, as the number and exposure of non-erodible roughness elements increased on test
surfaces undergoing deflation. It is shown that the velocity profile data are essential to understanding the physical processes driving the flux decay. The co-dependence of the sediment flux, shear velocity and surface geometric roughness is emphasized.
Late glacial sedimentation and history of the Lake Nipigon basin, Ontario
Etude de la sédimentation tardiglaciaire et de l'évolution du bassin du lac Nipigon, en Ontario, par l'analyse de 6 carottes de sédiments et de 4 coupes naturelles dans la falaise. Etude des successions sable et rythmites silto-argileuses (varves
Sedimentation rates and patterns in beaver ponds in a mountain environment
Biogeography ; Humid environment ; Montana ; Mountain ; Pond ; Sediment budget ; Slope ; Soil erosion ; United States of America ; Vegetation ; Water quality
The AA. examine the rates and volume of sedimentation occuring in recently constructed beaver ponds of known age in the northern Rocky Mountains of Glacier National Park, Montana, USA. They describe how these factors vary by pond-site type