Consulta: subjectFacets:"Sediment transport"
Registros recuperados: 34
Data/hora: 07/06/2024 01:13:36

Particle size specific magnetic properties across the Norwegian-Greenland Seas: Insights into the influence of sediment source and texture on bulk magnetic records
Provedor de dados: 5
Autores: Hatfield, Robert G.; Wheeler, Benjamin H.; Reilly, Brendan T.; Stoner, Joseph S.; Housen, Bernard A.
We make fundamental observations of the particle size variability of magnetic properties from 71 core tops that span the southern Greenland and Norwegian Seas. These data provide the first detailed regional characterization of how bulk magnetic properties vary with sediment texture, sediment source, and sediment transport. Magnetic susceptibility (MS) and hysteresis parameters were measured on the bulk sediment and the five constituent sediment particle size fractions (clay, fine, medium, and coarse silt, and sand). The median MS value of the medium silt size fraction is ~3‐5 times higher than that of the sand and clay size fractions and results in a strong sensitivity of bulk MS to sediment texture. Hysteresis properties of the clay size fraction are...
Tipo: Text
Palavras-chave: Northern Basaltic Province; Magnetic susceptibility; Nordic Seas; Magnetic grain size; Sediment source; Sediment transport.
Ano: 2019
URL: https://archimer.ifremer.fr/doc/00478/58998/61614.pdf

Impact of natural (waves and currents) and anthropogenic (trawl) resuspension on the export of particulate matter to the open ocean Application to the Gulf of Lion (NW Mediterranean)
Provedor de dados: 5
Autores: Ferre, B; De Madron, X; Estournel, C; Ulses, C; Le Corre, Gildas.
Modern sediment deposits on continental margins form a vast reservoir of particulate matter that is regularly affected by resuspension processes. Resuspension by bottom trawling on shelves with strong fishing activity can modify the scale of natural disturbance by waves and currents. Recent field data show that the impact of bottom trawls on fine sediment resuspension per unit surface is comparable with that of the largest storms.   We assessed the impact of both natural and anthropogenic processes on the dispersal of riverborne particles and shelf sediments on the Gulf of Lion shelf. We performed realistic numerical simulations of resuspension and transport forced by currents and waves or by a fleet of bottom trawlers. Simulations were conducted for a...
Tipo: Text
Palavras-chave: Mediterranean; Trawling; Fisheries; Shelf slope exchanges; Sediment transport; Sediment dynamics.
Ano: 2008
URL: http://archimer.ifremer.fr/doc/2008/publication-4682.pdf

Devenir de l'atrazine dans le bassin de Marennes-Oléron. Approche par la modélisation hydrodynamique, hydrosédimentaire et biogéochimique
Provedor de dados: 5
Autores: Vanhoutte Brunier, Alice.
Atrazine is the most widely used herbicide on cultured areas. This pesticide is degraded during its transport in rivers and streams, to the coastal area. Marennes Oléron is the main french oyster farming area, receiving the fresh water from the Charente river and ail the drainage coming from the coastal cultivated marshlands. Agriculture is thus claimed to be responsible for shellfish mortality in the aquaculture area. To simulate the changing fate of atrazine in the environment, a modelling strategy has been selected. a) First, using a two-way hydrodynamic model developped by IFREMER, the atrazine dilution trail in the Marennes Oléron area was simulated.Combined with larvae bioassays of Crassostrea gigas (Japanese oyster), the results show atrazine rates...
Tipo: Text
Palavras-chave: Produits phytosanitaires; Atrazine; Cycle biogéochimique; Modélisation; Dynamique sédimentaire; Vasières intertidales; Pesticides; Atrazine; Biogeochemical cycle; Models; Sediment transport; Intertidal muflats.
Ano: 2001
URL: http://archimer.ifremer.fr/doc/00412/52312/53082.pdf

Sediment and water movement in coastal embayments.
Provedor de dados: 5
Autores: Collins, M.
The investigations described in this report relating to Swansea Bay and Thermaicos Bay demonstrate that processes which take place in embayments, particularly those concerned with water and sediment movement, representing only a constituent part of a much larger transport system.
Tipo: Text
Palavras-chave: Coastal zone; Sediment transport; Tidal motion; Wave motion; Hydrodynamics; Bays; Water motion; Sediment movement.
Ano: 1985
URL: http://archimer.ifremer.fr/doc/1985/acte-1286.pdf

A model of sediment transport under the influence of surface bioturbation: generalisation to the facultative suspension-feeder Scrobicularia plana
Provedor de dados: 5
Autores: Orvain, Francis.
Flume experiments were designed to study how sediment erodibility was modified by the facultative suspension-feeder Scrobicularia plana living at different densities in sediment beds of various degrees of compaction. Two separate erosion phases were identified from the resuspension kinetics: (1) erosion of an unconsolidated surficial layer (i.e. fluff layer) and (2) the subsequent bed erosion. S. plana were found to influence both erosion phases: (1) erosion rates of the fluff layer were controlled by bioturbation activities, the extents of which were influenced by bivalve density and the degree of compaction of the sediments, and (2) critical thresholds of the subsequent bed erosion decreased as clam density increased, likely due to depressions in the...
Tipo: Text
Palavras-chave: Resuspension; Model; Functional groups; Sediment transport; Bioturbation; Scrobicularia plana; Intertidal mudflat.
Ano: 2005
URL: http://archimer.ifremer.fr/doc/2005/publication-3776.pdf

Les embouchures mésotidales (tidal inlets) et leur relation avec les littoraux adjacents - Exemple de la Barra Nova, Sud Portugal
Provedor de dados: 5
Autores: Balouin, Yann.
Tidal inlets are among the most dynamic morphological features along the world coastlines. Their evolution and stability, frequently critical to the local environment, are dependent on the relative influence of longshore transport along adjacent coasts and tidal flows in the inlet. Main objective of this study was to quantify the processes involved in the inlet morphodynamics in order to determine the key parameters of these systems and to predict medium to long-term evolution. Morphology evolution (bathymetry, remote sensed video data), hydrodynamics and sediment transport measurements were analyzed to quantify the inlet dynamics. Our approach was based on the study of hydrosedimentary processes along the adjacent coastline, and inlet responses to...
Tipo: Text
Palavras-chave: Embouchure tidale; Morphodynamique; Transport littoral; Delta de jusant; Ria Formosa; Modèles; Tidal inlet; Morphodynamics; Sediment transport; Ebb-tidal delta evolution; Ria Formosa; Models.
Ano: 2001
URL: https://archimer.ifremer.fr/doc/00656/76797/77963.pdf

Remaniements sédimentaires superficiels sur l'estran occidental de la baie du Mont Saint-Michel
Provedor de dados: 5
Autores: Bonnot-courtois, C; Bassoullet, Philippe; Tessier, B; Cayocca, Florence; Le Hir, Pierre; Baltzer, A.
In order to define and quantify the rhythm and amplitude of the processes of erosion and sedimentation on broad tidal flats, in situ measurements of sediment elevation have been performed in the western part of the Mont-Saint-Michel bay. The amplitude of reworking is generally low (&lt; ± 5 cm), and variable from west to east. The wind influence on tidal currents and surficial reworking emphasizes erosion phases rapidly followed by accretion of similar amplitude on the whole tidal flat. A numerical model for hydrodynamics and sediment transport is applied to Mont Saint Michel Bay, where ecological concerns are related to sediment transfers.
Tipo: Text
Palavras-chave: Sediment transport; Numerical model; Erosion sedimentation budget; "In situ" measurements; Tidal sandy mud flat; Transport sédimentaire; Modèle numérique; Bilan érosion sédimentation; Mesures in situ; Estran sablo vaseux.
Ano: 2008
URL: http://archimer.ifremer.fr/doc/2008/publication-6279.pdf

Devenir de l'atrazine dans le bassin de Marennes-Oléron (France) - Approche par la modélisation hydrodynamique, hydrosédimentaire et biogéochlmique
Provedor de dados: 5
Autores: Vanhoutte Brunier, Alice.
Atrazine is the most widely used herbicide on cultured areas. This pesticide is degraded during its transport in rivers and streams, to the coastal area. Marennes Oleron is the main french oyster farming area, receiving the fresh water from the Charente river and all the drainage coming from the coastal cultivated marshlands. Agriculture is thus claimed to be responsible for shellfish mortality in the aquaculture area. To simulate the changing fate of atrazine in the environment, a modelling strategy has been selected, a) First, using a two-way hydrodynamic model developped by IFREMER, the atrazine dilution trail in the Marennes Oleron area was simulated.Combined with larvae bioassays of Crassostrea gigas (Japanese oyster), the results show atrazine rates...
Tipo: Text
Palavras-chave: Produits phytosanitaires; Atrazine; Cycle biogéochimique; Modélisation; Dynamique sédimentaire; Vasières intertidales.; Pesticides; Atrazine; Biogeochemical cycle; Models; Sediment transport; Intertidal muflats.
Ano: 2001
URL: http://archimer.ifremer.fr/doc/00306/41764/40977.pdf

Modélisation morphodynamique d'une embouchure tidale : Application aux Passes d'entrée du Bassin d'Arcachon
Provedor de dados: 5
Autores: Cayocca, Florence.
The Arcachon tidal inlet exhibits a particularly active morphology due to strong tidal currents and rough wave conditions. During the past 300 years, maximum and minimum extents of the Cap Ferret sand spit have resulted in a difference of 8 km while two channels have alternatively allowed circulation between the lagoon and the ocean.   A bidimensional horizontal morphodynarnic model was developed in order to simulate the system evolution under tidal forcing alone or under combined tide and wave action. Modelling at a scale of decades requires the definition of mean annual wave and tide conditions which are representative with respect to sediment transport. Medium term results thus give general trends of evolution. Driven by these average conditions and...
Tipo: Text
Palavras-chave: Littoral drift; Sediment transport; Tide; Waves; Arcachon lagoon; Tidal inlet; Modelling; Morphodynamic; Dérive littorale; Transport sédimentaire; Marée; Houle; Bassin d'Arcachon; Modèle; Morphodynamique.
Ano: 1996
URL: http://archimer.ifremer.fr/doc/1996/these-4520.pdf

Some evidences of northward fine sediment transport in the northern Portuguese continental shelf
Provedor de dados: 5
Autores: Drago, T; Oliveira, A; Magalhaes, F; Cascalho, J; Jouanneau, Jm; Vitorino, Joao.
On the basis of sedimentological and oceanographical data, a transport scheme for fine-grained material is proposed in order to explain the location of a muddy deposit present in the northern Portuguese continental shelf, north-west off the Douro River mouth. This mid-shelf deposit is recent, active and its main source is apparently the Douro River. The sediment supply can be related with the oceanographic conditions in winter regime, characterised by a poleward along shelf current with a bottom westward component, as a consequence of a south-west wind. The resulting fine sediment transport, essentially made in the bottom nepheloid layer is believed to have a north-west direction.
Tipo: Text
Palavras-chave: Plateau continental portugais; Sédiment fin; Biotite; Transport de sédiments; Hydrologie hivernale; Portuguese shelf; Fine sediments; Biotite; Sediment transport; Winter regime.
Ano: 1998
URL: http://archimer.ifremer.fr/doc/00326/43681/43193.pdf

Wave- and current-induced bottom shear stress distribution in the Gulf of Lions
Provedor de dados: 5
Autores: Dufois, Francois; Garreau, Pierre; Le Hir, Pierre; Forget, P.
Simulations of both currents and waves were performed throughout the year 2001 to assess the relative contribution of each to their overall erosive potential on the Gulf of Lions shelf. Statistical analysis of bottom shear stress (BSS) was compared to sediment grain-size distribution on the bottom. The hydrodynamic features of the bottom layer coincide with the distribution of surficial sediments, and three areas with different hydro-sedimentary characteristics were revealed. (i) The sandy inner shelf ( &lt; 30 m) area is a high-energy-wave dominated area but may be subjected to intense current-induced BSS during on-shore winds along the coast and during continental winds mainly in the up-welling cells. (ii) The middle shelf (30-100 m) is a low-energy...
Tipo: Text
Palavras-chave: Gulf of Lions; 3D modelling; Bottom shear stress; Sediment transport.
Ano: 2008
URL: http://archimer.ifremer.fr/doc/2008/publication-6305.pdf

Fortnightly tidal asymmetry inversions and perspectives on sediment dynamics in a macrotidal estuary (Charente, France)
Provedor de dados: 5
Autores: Toublanc, Florence; Brenon, Isabelle; Coulombier, T.; Le Moine, Olivier.
Tidal asymmetry is a phenomenon that characterises estuarine hydrodynamics and has a strong impact on sediment dynamics. Extensive research has been dedicated to studying tidal dynamics in semidiurnal macrotidal estuaries, highlighting several general principles. The ratio of flood to ebb peak velocities and differences in ebb and flood durations are often used to characterise the asymmetry encountered in estuaries. In the Charente estuary (French Atlantic coast), water surface elevation data obtained using an ADCP (Acoustic Doppler Current Profiler) and a tide gauge show that the duration asymmetry undergoes inversions during the spring-neap tidal cycle. A two-dimensional hydrodynamics model is used to investigate the connection between spring-neap...
Tipo: Text
Palavras-chave: Estuary; Tidal asymmetry; Duration asymmetry; Ebb/flood dominance; Morphology; External/internal overtides; Sediment transport.
Ano: 2015
URL: http://archimer.ifremer.fr/doc/00245/35650/40645.pdf

High-Resolution Morphobathymetric Analysis and Evolution of Capbreton Submarine Canyon Head (Southeast Bay of Biscay—French Atlantic Coast) over the Last Decade Using Descriptive and Numerical Modeling
Provedor de dados: 5
Autores: Mazieres, Alais; Gillet, Herve; Castelle, Bruno; Mulder, Thierry; Guyot, Corentin; Garlan, Thierry; Mallet, Cyril.
In this study, the Capbreton canyon head, just off the coast, is investigated using high-resolution multibeam bathymetry datasets, sediment samples and numerical modeling. The HR bathymetry analysis reveals a morphological connection between the longshore trough and the head of the canyon. The analysis of recent sediment samples shows a clear correlation between the sediment of the canyon head and that of the nearshore. Hydrodynamic modeling (a coupled wave-flow model) shows that for high-energy waves, the rotational nature of surf-zone circulation reverses and wave-induced currents have the potential to transport large quantities of nearshore sands toward the canyon head. All these arguments support the assumption that the canyon head captures a part of...
Tipo: Text
Palavras-chave: Longshore drift; Submarine canyon; Capbreton; Hydrodynamic modeling; Sediment transport.
Ano: 2014
URL: http://archimer.ifremer.fr/doc/00180/29118/27524.pdf

Modelisation morphodynamique de l'embouchure de la seine
Provedor de dados: 5
Autores: Waeles, Benoit.
The mouth of the Seine has been undergoing intense morphological changes for decades, because of containment work to improve access to the ports of Rouen and Le Havre. A significant trend is the progradation of the downstream estuary. Simultaneously, the surface area of the intertidal mudflats tends to decrease. The estuary's sediments are composed of silt and fine sand (respectively transported from the river Seine and the open sea). Their distribution is linked to the hydrodynamic characteristics of the estuary and may display layered vertical structures. To understand the estuary's morphological changes, a morphodynamic ditigal model is developed from a validated (3D) model of silty sediment transport. A model of suspended fine sand transport as well as...
Tipo: Text
Palavras-chave: Seine estuary; Modelling; Sediment transport; Hydrodynamic; Morphodynamic; Seine estuaire; Modelisation; Transport sediment; Hydrodynamique; Morphodynamique.
Ano: 2005
URL: http://archimer.ifremer.fr/doc/2005/these-2195.pdf

Impact of winter storms on sediment erosion in the Rhone River prodelta and fate of sediment in the Gulf of Lions (North Western Mediterranean Sea)
Provedor de dados: 5
Autores: Dufois, Francois; Verney, Romaric; Le Hir, Pierre; Dumas, Franck; Charmasson, Sabine.
In this study a three-dimensional sediment transport model was developed. The model accounts for both current and wave forcing on the sediment and was implemented over the Gulf of Lions. A two-way nesting technique was used to focus on the Rhone River prodelta which is considered as a sink for riverine sediment. In addition, to understand the resuspension of trapped sediment over the Rhone prodelta, an in situ experiment, called SCOPE, was conducted during the winter 2007/2008. The experiment consisted of measuring hydro-sedimentary parameters using a mooring station comprising a current profiler (ADCP) and an altimeter (acoustic transducer) located in the eastern part of the Rhone prodelta. The three-dimensional transport model was validated using these...
Tipo: Text
Palavras-chave: Sediment transport; Gulf of Lions; Rhone prodelta; 3D modelling; ADCP; ALTUS.
Ano: 2014
URL: http://archimer.ifremer.fr/doc/00165/27584/25743.pdf

Numerical modelling of heterogeneous sediment transport: new insights for particulate radionuclide transport and deposition
Provedor de dados: 5
Autores: Rivier, Aurélie; Le Hir, Pierre; Bailly Du Bois, Pascal; Laguionie, Philippe; Morillon, Mehdi.
A sediment transport module which solves simultaneously bedload and suspended load is developed, in a context of multiclass sediment transport. Different approaches are used to simulate each transport mode: (i) bedload transport results from divergence of transport capacity and (ii) suspension transport is solved using erosion and settling fluxes associated with advection/diffusion equation. A focus is made on the significance of hiding and exposure processes in case of heterogeneous sediment bed. Their influence is strong on bedload sediment transport, and induces specific trends of sediment sorting in sand dunes. The application to heterogeneous sediment dynamics in the macrotidal area of the Normand Breton Gulf (English Channel), show that hiding and...
Tipo: Text
Palavras-chave: Sediment transport; Numerical modelling; Hiding; Exposure; Bedload; Suspension.
Ano: 2017
URL: http://archimer.ifremer.fr/doc/00394/50580/51274.pdf

Numerical modeling of bottom trawling-induced sediment transport and accumulation in La Fonera submarine canyon, northwestern Mediterranean Sea
Provedor de dados: 5
Autores: Payo-payo, Marta; Silva Jacinto, Ricardo; Lastras, G.; Rabineau, Marina; Puig, P.; Martin, J.; Canals, M.; Sultan, Nabil.
Bottom trawling leads to recurrent sediment resuspension events over fishing grounds. Recent studies have shown how bottom trawling can drive seascape reshaping at large spatial scales and enhance sediment transport in submarine canyons, which subsequently impacts deep-sea ecosystems. Present knowledge on the transfer and accumulation of sediment flows triggered by bottom trawling is based on localized and infrequent measurements whilst a more complete picture of the process is needed. The present work focuses on the modeling of sediment transport and accumulation resulting from trawling activities in La Fonera submarine canyon, northwestern Mediterranean Sea, thus contributing to an improved assessment of trawling impacts. Based on mooring data within a...
Tipo: Text
Palavras-chave: Bottom trawling; Inverse model; Modeling; Sediment transport; Submarine canyon; Turbidity currents.
Ano: 2017
URL: http://archimer.ifremer.fr/doc/00374/48549/48862.pdf

Synthese des connaissances sur les effets du depot de dragage d''Octeville
Provedor de dados: 5
Autores: Chauvin, P; Freger, G; Guyader, Julie.
Le Havre Harbour dredging wastes are deposited off Octeville and cause the spreading of muds in this area. Currents disperse the sediments on a large zone. Physico-chemical analysis show low micropolluants concentrations. Water quality seems not to be affected by these deposits, but a reduction of species living in the sediments is observed.
Tipo: Text
Palavras-chave: Water quality; Sediment transport; Waste disposal sites; Environmental impact; Sediment pollution; Dredge spoil; Ocean dumping.
Ano: 1985
URL: http://archimer.ifremer.fr/doc/1985/acte-1316.pdf

Evaluation des apports fluviatiles dans l''estuaire de la Seine
Provedor de dados: 5
Autores: Avoine, J.
Economic activities and urbanization along the Seine watershed, are the main factors of increased river discharge with natural deposits. A long term supervision of this river has allowed the assessment of the liquid flow rate, the solid load, and the metallic pollution.
Tipo: Text
Palavras-chave: Seasonal variations; Trace metals; Sediment transport; Fluid flow; Brackishwater pollution; Estuarine sedimentation; River discharge.
Ano: 1985
URL: http://archimer.ifremer.fr/doc/1985/acte-1274.pdf

Optical algorithms at satellite wavelengths for Total Suspended Matter in tropical coastal waters
Provedor de dados: 5
Autores: Ouillon, Sylvain; Douillet, Pascal; Petrenko, Anne; Neveux, Jacques; Dupouy, Cecile; Froidefond, Jean-marie; Andrefouet, Serge; Munoz-caravaca, Alain.
Is it possible to derive accurately Total Suspended Matter concentration or its proxy, turbidity, from remote sensing data in tropical coastal lagoon waters? To investigate this question, hyperspectral remote sensing reflectance, turbidity and chlorophyll pigment concentration were measured in three coral reef lagoons. The three sites enabled us to get data over very diverse environments: oligotrophic and sediment-poor waters in the southwest lagoon of New Caledonia, eutrophic waters in the Cienfuegos Bay (Cuba), and sediment-rich waters in the Laucala Bay (Fiji). In this paper, optical algorithms for turbidity are presented per site based on 113 stations in New Caledonia, 24 stations in Cuba and 56 stations in Fiji. Empirical algorithms are tested at...
Tipo: Text
Palavras-chave: Ocean color; Remote sensing; Sediment transport; Suspended matter; Turbidity; New Caledonia; Cuba; Fiji.
Ano: 2008
URL: https://archimer.ifremer.fr/doc/00203/31417/29808.pdf

Infragravity waves: from driving mechanisms to impacts
Provedor de dados: 5
Autores: Bertin, Xavier; De Bakker, Anouk; Van Dongeren, Ap; Coco, Giovanni; Andre, Gael; Ardhuin, Fabrice; Bonneton, Philippe; Bouchette, Frederic; Castelle, Bruno; Crawford, Wayne C.; Davidson, Mark; Deen, Martha; Dodet, Guillaume; Guerin, Thomas; Inch, Kris; Leckler, Fabien; Mccall, Robert; Muller, Heloise; Olabarrieta, Maitane; Roelvink, Dano; Ruessink, Gerben; Sous, Damien; Stutzmann, Eleonore; Tissier, Marion.
Infragravity (hereafter IG) waves are surface ocean waves with frequencies below those of wind-generated "short waves" (typically be- low 0.04 Hz). Here we focus on the most common type of IG waves, those induced by the presence of groups in incident short waves. Three related mechanisms explain their generation: (1) the development, shoaling and release of waves bound to the short-wave group envelopes (2) the modulation by these envelopes of the location where short waves break, and (3) the merging of bores (breaking wave front, resembling to a hydraulic jump) inside the surfzone. When reaching shallow water (O(1-10 m)), IG waves can transfer part of their energy back to higher frequencies, a process which is highly dependent on beach slope. On gently...
Tipo: Text
Palavras-chave: Infragravity waves; Bound wave; Dissipation; Reflection; Sediment transport; Barrier breaching; Seiche; Earth hum.
Ano: 2018
URL: https://archimer.ifremer.fr/doc/00417/52876/53800.pdf

Numerical study of sedimentary impact of a storm on a sand beach simulated by hydrodynamic and sedimentary models
Provedor de dados: 5
Autores: Meule, S; Pinazo, C; Degiovanni, C; Barusseau, Jp; Libes, M.
In marine coastal environments, storms have a major morphological impact on sand beaches. This study, part of the French Programme National d'Environnement Cotier, consisted in developing and applying hydrodynamic and sedimentary models to simulate the major processes that modify sand beaches. In order to study sediment dynamics, we developed three models to simulate waves, currents and sediment transport associated with a storm event. The wave model was a Mild Slope Equation model based on the parabolic approximation of the refraction-diffraction equation of Berkhoff. The hydrodynamic model was obtained by the depth-average of Navier Stockes' equations forced by the terms of radiation stresses induced by waves. The sedimentary model SEDSIM developed by...
Tipo: Text
Palavras-chave: Modification de la plage; Modèles numériques; Transport sédimentaire; Tempête; Courants induits par la houle; Beach modification; Numerical models; Sediment transport; Storm; Wave-induced current.
Ano: 2001
URL: http://archimer.ifremer.fr/doc/00322/43339/42887.pdf

The impact of tides and waves on near-surface suspended sediment concentrations in the English Channel
Provedor de dados: 5
Autores: Guillou, Nicolas; Rivier, Aurelie; Chapalain, Georges; Gohin, Francis.
Numerous ecological problems of continental shelf ecosystems require a refined knowledge of the evolution of suspended sediment concentrations (SSC). The present investigation focuses on the spatial and temporal variabilities of near-surface SSC in coastal waters of the English Channel (western Europe) by exploiting numerical predictions from the Regional Ocean Modeling System ROMS. Extending previous investigations of ROMS performances in the Channel, this analysis refines, with increased spatial and temporal resolutions, the characterization of near-surface SSC patterns revealing areas where concentrations are highly correlated with evolutions of tides and waves. Significant tidal modulations of near-surface concentrations are thus found in the eastern...
Tipo: Text
Palavras-chave: Sediment transport; Numerical modeling; Satellite; ROMS; MERIS; MODIS.
Ano: 2017
URL: https://archimer.ifremer.fr/doc/00345/45607/45227.pdf

Sedimentation, transport und erosion an der  Nordküste Kolumbiens zwischen Barranquilla und der Sierra Nevada de Santa Marta
Provedor de dados: 20
Autores: Erffa, A. Frhr. von.
El Río Magdalena desemboca actualmente en el mar Caribe, por el extremo occidental de este territorio y ha formado varios deltas, estos se han originado en tres fases comprendidas en el cuaternario reciente. Los dos más antiguos quedaron destruidos por la erosión y solamente son detectados en la morfología submarina. El delta siguiente en antigüedad, alcanzó su mayor amplitud hace 2.400 años aproximadamente La etapa de destrucción de este delta se inició por aquellos tiempos, y aún continua en actividad. El delta más reciente se está formando al frente de la boca actual del Río Magdalena. Se describen los rasgos topográficos, sedimentológicos y la distribución de la fauna bentónica, en los sectores NE y E de la plataforma submarina de San Andrés. La...
Tipo: Journal Contribution
Palavras-chave: Coastal lagoons; Estuaries; Geology; Sediments; Erosion; Coastal erosion; Sediment transport; Estuaries; Geology; Erosion; Coastal lagoons; Coastal erosion; Http://aims.fao.org/aos/agrovoc/c_2673; Http://aims.fao.org/aos/agrovoc/c_3232; Http://aims.fao.org/aos/agrovoc/c_2651; Http://aims.fao.org/aos/agrovoc/c_1697; Http://aims.fao.org/aos/agrovoc/c_9949.
Ano: 1973
URL: http://hdl.handle.net/1834/3254

Efectos directos e indirectos de la bioturbación producida por el cangrejo cavador Chasmagnathus granulata en ambientes estuariales
Provedor de dados: 20
Autores: Botto, F.
Universidad Nacional de Mar del Plata, Facultad de Ciencias Exactas y Naturales (Argentina)
Tipo: Theses and Dissertations
Palavras-chave: Bioturbation; Sediment analysis; Sediment transport; Comparative studies; Detritus; Population number.
Ano: 2001
URL: http://hdl.handle.net/1834/2956

Estudio de las características sedimentológicas del estero Santa Rosa en la Provincia de El Oro, Ecuador
Provedor de dados: 20
Autores: Soledispa, B.
En este artículo se determina los tipos de sedimentos predominantes en el área de estudio, su distribución aproximada en el mismo, así como su posible proveniencia. Determinar la carga de sedimentos en suspensión del estero en una determinada época del año.
Tipo: Journal Contribution
Palavras-chave: Sediments; Sediment distribution; Sediment composition; Sediment transport; Marshes; Marshes; Http://aims.fao.org/aos/agrovoc/c_4631.
Ano: 2006
URL: http://hdl.handle.net/1834/2374

Simulation numérique du transport des sables sous l'effet des vents dans le Golfe de Tunis
Provedor de dados: 20
Autores: Koutitonsky, V.; Mouldi, Brahim; Bejaoui, B.; Sammari, Ch.
La dynamique sédimentaire le long de littoral est étroitement liée à la direction et à l’intensité des courants littoraux engendrés par les vents, les vagues et la marée. L’objectif de cette étude est de simuler numériquement la circulation et le transport des sédiments non cohésifs (sables) le long du littoral du golfe de Tunis sous l’effet unique des vents. Plusieurs directions des vents ont été imposées au modèle hydrodynamique MIKE21-HD tout en gardant  une vitesse constante de 7 m.s-1. Les courants stationnaires générés par ces vents ont ensuite servi à forcer le modèle de transport de sédiments non cohésifs MIKE21-ST. En supposant que la quantité de sable disponible est illimitée, les simulations montrent que les taux du transport de sédiment du côté...
Tipo: Journal Contribution
Palavras-chave: Nearshore currents; Sand; Sediment transport; Simulation; Water circulation; Winds; Sand; Simulation; Water circulation; Winds; Http://aims.fao.org/aos/agrovoc/c_6779; Http://aims.fao.org/aos/agrovoc/c_5209; Http://aims.fao.org/aos/agrovoc/c_8314; Http://aims.fao.org/aos/agrovoc/c_8401.
Ano: 2007
URL: http://hdl.handle.net/1834/4256

Influencia de los procesos costeros en las características sedimentológicas en el área de la Península de Santa Elena
Provedor de dados: 20
Autores: Jácome de Solórzano, M.; Llanos de Bonilla, L.
En el presente trabajo se pretende determinar las características del transporte que se produce a lo largo de la línea de costa en estudio, y a la vez establecer la distribución de los sedimentos de playa y en suspensión a partir de su textura, parámetros estadísticos y concentración.
Tipo: Journal Contribution
Palavras-chave: Sediment transport; Beaches; Longshore sediment transport; Sediment composition; Sediment distribution; Beaches; Http://aims.fao.org/aos/agrovoc/c_850.
Ano: 1992
URL: http://hdl.handle.net/1834/2188

Estudio de los sedimentos del sector donde convergen los ríos Daule y Babahoyo, y las posibles causas que están formando un  nuevo islote en ese sector
Provedor de dados: 20
Autores: Soledispa, B.
Los objetivos de este artículo son: - Caracterizar el área de estudio en base a los tipos de sedimentos que predominan en el sector, a su distribución aproximada en el mismo, así como a su posible proveniencia. - Determinar la carga de sedimentos en suspensión que transportan los ríos.  - Determinar las posibles causas que están originando la formación de una nueva isla en la desembocadura del Río Daule.
Tipo: Journal Contribution
Palavras-chave: Sediments; Granulometry; Sediment transport; Silt; Rivers; Sand; Sediment analysis; Rivers; Sand; Http://aims.fao.org/aos/agrovoc/c_6617; Http://aims.fao.org/aos/agrovoc/c_6779.
Ano: 2002
URL: http://hdl.handle.net/1834/2268

Degradation of the riparian wetlands in the Lake Victoria basin - Yala swamp case study
Provedor de dados: 20
Autores: Thenya, Thuita; Wassmann, Reiner; Verchot, Louis; Mungai, David.
Land degradation is as a result of broad range of scales and factors, which include biophysical, climatic, demographic and socio-economic. The aim of this paper was to provide an analysis of wetland utilisation, ecosystem degradation and their effect on the Lake Victoria (Kenya) ecosystem. This involved analysis of socioeconomic and remote sensed data. The main sources of wetland degradation in the Lake Victoria basin were identified as (1) farming activities, (2) grazing and macrophyte harvesting and (3) coupled with catchment degradation-deforestation. These factors were closely related to the demographic dynamics and unsustainable land utilisation practices. Socio-economic data provided valuable insight on the pattern of wetland utilisation and possible...
Tipo: Proceedings Paper
Palavras-chave: Riparian environments; Degradation; Wetlands; Inland waters; Catchment area; Remote sensing; Environmental effects; Socioeconomic aspects; Resource development; Sediment transport; Silting; Water pollution; Wetlands; Deforestation; Natural resources; Utilization; Land use; Pollutants.
Ano: 2006
URL: http://hdl.handle.net/1834/5313

Interacciones ecológicas entre el cangrejo cavador Chasmagnathus granulata Dan(1851) y los espartillares de Spartina densiflora Brongniarti(1829), meiofauna asociada y características del sustrato en la laguna costera Mar Chiquita (Buenos Aires, Argentina)
Provedor de dados: 20
Autores: Bortolus, A.
Universidad Nacional de Mar del Plata, Facultad de Ciencias Exactas y Naturales (Argentina)
Tipo: Theses and Dissertations
Palavras-chave: Brackishwater ecology; Salt marshes; Sediment transport.
Ano: 2001
URL: http://hdl.handle.net/1834/2958

Comparación de la tasa anual de transporte de sedimentos de playa en la Isla Jambelí, utilizando formulación sugerida por varios autores
Provedor de dados: 20
Autores: Vera, L.
En este trabajo, además de este texto se ha revisado información de publicaciones de los últimos 10 años en las cuales se utilizan formulaciones antiguas, modificadas o nuevas con el propósito de establecer comparaciones entre y definir la que mejor se adapte a la costa seleccionada.
Tipo: Journal Contribution
Palavras-chave: Sediment transport; Mathematical models; Annual variations; Mathematical models; Http://aims.fao.org/aos/agrovoc/c_24199.
Ano: 2007
URL: http://hdl.handle.net/1834/2502

Cartographie du Middelkerke Bank: dynamique sédimentaire, structure géologique, facies sédimentaires
Provedor de dados: 27
Autores: Lanckneus, J.; De Moor, G.; Berné, S.; Chamley, H.; De Batist, M.; Henriet, J.-P.; Terwindt, J.; Trentesaux, A.
The paper analyses the first results obtained in the framework of the RESECUSED project (MAST) whose objectives are the detailed analysis of the behaviour of sediments and bedforms of and on the Middelkerke Bank (Belgian Continental Shelf) and the study of the interaction between water movement, sediment transport and bedform mobility. The results include a preliminary analysis of the residual bottom load transport paths deduced from side scan sonar registrations, a map of the sandwaves on the bank, the first grain-size results of the superficial sediment and a study on the internal structure of the bank.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bed forms; Continental shelves; Grain size; Granulometry; Sand waves; Sediment dynamics; Sediment transport; Shelf facies; Side scan sonar.
Ano: 1991
URL: http://www.vliz.be/imisdocs/publications/262327.pdf

Hydrosedimentologic disturbance index applied to watersheds of Minas Gerais state
Provedor de dados: 64
Autores: Durães,Matheus Fonseca; Mello,Carlos Rogério de.
Ecological indicators have become important tools for assessment and monitoring of natural resources, being the understanding of the relationship between antropic activities and the environmental response essential for their structuring. Although the development of potential indicators may prove sensitive to many variables, they must demonstrate their ability to take the surrounding conditions, from those relatively preserved to those highly disturbed. Based on this premise, the development of the Hydrossedimentological DisturbanceIndex (HSDI) for environmental assessment at watersheds in Minas Gerais state, emerges as a potential tool to support decisions which should be focused on the improvement of natural resources management. A HSDI proposal was...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Environmental indicators; Water resource; Soil erosion; Sediment transport.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542014000100007