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Registros recuperados: 24
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Aide mémoire de dynamique sédimentaire. 7ème édition ArchiMer
Le Hir, Pierre.
This aide-mémoire is not a lesson on sedimentary dynamics but more of a calculation form. Its use implies a good knowledge of the involved processes. This report presents the basic formulations used for the calculation of the hydrodynamic forcings as well as the main sediment behavioural laws, in order to help the reader conduct a basic sediment transportation calculation.
Tipo: Text Palavras-chave: Bottom shear stress; Boundary layer; Mathematical modelling; Transport rate; Cohesive sediments; Non cohesive sediments; Sediment dynamics; Contrainte de cisaillement au fond; Couche limite; Modélisation mathématique; Fonctions de transport; Sédiments cohésifs; Sédiments non cohésifs; Dynamique sédimentaire.
Ano: 2008 URL: http://archimer.ifremer.fr/doc/2008/rapport-6273.pdf
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APPLICABILITY OF FINGERPRINTING FOR IDENTIFICATION OF SEDIMENT SOURCES IN A MESOSCALE SEMIARID CATCHMENT REA
Silva,Eveline M. R. da; Medeiros,Pedro; Araújo,José C. de.
ABSTRACT The study aimed at identifying sediment sources in a mesoscale catchment (933 km2) located in the Brazilian semiarid region. The research explored the potential of using a fingerprinting technique to verify the origin of eroded sediments in a catchment by comparing physical and mineralogical properties of potential sediment sources and sediments deposited in a pond (6 × 103 m3 storage capacity) and a reservoir (20 × 106 m3 storage capacity). The goal was to assess the feasibility of using such material to identify sediment sources in a semiarid environment with a high density of surface reservoirs. Chemical variables were studied by mineralogical analysis using scanning electron microscopy (SEM) and multivariate statistics. The results showed that...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Sediment dynamics; Soil physics; Soil mineralogy; Semiarid.
Ano: 2018 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162018000400553
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Apports de l''imagerie fournie par le sonar a balayage lateral a la connaissance de la dynamique sedimentaire en Baie de Seine ArchiMer
Auffret, J; D'Ozouville, L.
Continous process recording of lateral scanning sonar allows the observation of bottom sediments repartition contrasts. Their heterogeneity and evolution, the nature of contacts between different sediment deposits can be studied by this instrument, which completes the different techniques used for the sediment dynamics study.
Tipo: Text Palavras-chave: Sediment composition; Sediment distribution; Sonar imagery; Sediment dynamics; Sonar.
Ano: 1985 URL: http://archimer.ifremer.fr/doc/1985/acte-1284.pdf
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Biogeochemistry of the Amazonian floodplains insights from six end member mixing models. Repositório Alice
BUSTILLO, V.; VICTORIA, R. L.; MOURA, J. M. S. de; VICTORIA, D. de C.; TOLEDO, A. M. A.; COLLICCHIO, E..
2010
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Amazon river; Floodplains; Biogeochemical cycles; Sediment dynamics; Diagenesis; CO2 outgassing.
Ano: 2010 URL: http://www.alice.cnptia.embrapa.br/handle/doc/879703
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Cartographie du Middelkerke Bank: dynamique sédimentaire, structure géologique, facies sédimentaires OMA
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
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Comportement chimique et geochimique des elements a l'état de traces dans l''estuaire de la Seine: Une synthese des resultats ArchiMer
Guegueniat, P.
Five topics are developed in this synthesis: (1) multi elements analysis in geochemistry; (2) iron geochemical behavior; (3) complexing properties of waters; (4) copper behavior in estuarine waters; (5) impact of sediment dynamics on dissolved metals concentration.
Tipo: Text Palavras-chave: Geographical distribution; Radiochemistry; Brackishwater pollution; Sediment dynamics; Dissolved chemicals; Heavy metals; Geochemistry; Physicochemical properties; Trace elements.
Ano: 1985 URL: http://archimer.ifremer.fr/doc/1985/acte-1290.pdf
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Contributions des traceurs radioactifs a l''etude des mouvements sedimentaires en Baie de Seine ArchiMer
Avoine, J; Caillot, A; Hoslin, R; Larsonneur, C; Massias, L; Quesney, M.
Sediment dynamics have been studied from 1979 to 1984 by the use of radio active tracers, to quantify sediment transport and to know the limits of tides and swell action in terms of sediment composition and depth. This technique has allowed the study of sand drifting (between -2 m and -15 m) and resuspension of muddy sediments. The effects of sediment movements on estuarine sediment accumulation are included in this report.
Tipo: Text Palavras-chave: Radioactive tracers; Sediment movement; Sediment dynamics.
Ano: 1985 URL: http://archimer.ifremer.fr/doc/1985/acte-1285.pdf
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Distribution de 40 elements a l''etat de traces dans les suspensions de la Seine. Utilisation du lanthane pour etudier les processus sedimentaires dans l''estuaire et dans la baie ArchiMer
Guegueniat, P; Boust, D; Hemon, G; Phillipot, J; Lagarde, G; Heitz, C.
This work has three objectives in view: (1) the establishment of spatial distribution of 40 trace elements in suspensions and sediments of the Seine estuary and bay; (2) the research of non-reactive geochemical tracers of fluvial deposits; and (3) the illustration of sediment dynamics influence on distribution of elements during the particulate period.
Tipo: Text Palavras-chave: Sediment chemistry; River discharge; Geographical distribution; Estuarine dynamics; Sediment dynamics; Suspended particulate matter; Trace elements.
Ano: 1985 URL: http://archimer.ifremer.fr/doc/1985/acte-1297.pdf
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Dynamique des suspensions et des depots: Synthese des discussions ArchiMer
Larsonneur, C.
During the debate, the observations have dealt with balance-sheets, swell influence, sediment movements, and sedimentation flow deducted from suspensions studies. General remarks have been formulated, and a distinction of main fluvial mouths in the French littoral have been suggested.
Tipo: Text Palavras-chave: Drowned valleys; Deltas; Estuaries; Coastal zone; Particle motion; Suspended particulate matter; Sediment dynamics.
Ano: 1985 URL: http://archimer.ifremer.fr/doc/1985/acte-1287.pdf
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Etude de l’hydrodynamique sédimentaire de la lagune de Bizerte OceanDocs
Béjaoui, B.; Brahim, M.; Ataoui, A..
Les résultats des analyses granulométriques des sédiments de surface de la lagune de Bizerte, prélevés à différentes profondeurs, ont permis d’identifier la nature de ses sédiments et de préciser les facteurs et les phénomènes qui interviennent dans leur transport et leur dépôt. L’étude sédimentologique a montré que les matériaux détritiques d’origine continentale et les sédiments provenant de l’érosion des côtes sont soumis à une dynamique qui est contrôlée essentiellement par l’action des courants dus essentiellement aux vents.
Tipo: Journal Contribution Palavras-chave: Sediment analysis; Sediment dynamics; Surveys; Surveys; Http://aims.fao.org/aos/agrovoc/c_7537.
Ano: 2008 URL: http://hdl.handle.net/1834/4160
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Experimental and numerical characterization of an oyster farm impact on the flow ArchiMer
Gaurier, Benoit; Germain, Gregory; Kervella, Youen; Davourie, Julia; Cayocca, Florence; Lesueur, Patrick.
Shellfish farming, particularly oyster farms, suffers from strong siltation phenomena which are harmful to the production of shellfish. The lack of knowledge about the impact of an oyster farm on the wave propagation and on the flow remains a significant difficulty for the comprehension of sediment transport processes in coastal zones. These effects are one of the possible sources of sedimentation. The study presented here focuses on describing finely hydrodynamical phenomena (velocity fields, turbulence parameters) around oyster tables. The analysis is based on experimental trials carried out in a flume tank on reduced models of oyster tables. Experiments highlight the flow perturbations in the near field and constitute a database for validation of...
Tipo: Text Palavras-chave: Sediment dynamics; Oyster table; LDV measurement; Computational fluid dynamics; Porosity; Boundary layer.
Ano: 2011 URL: http://archimer.ifremer.fr/doc/00043/15421/12974.pdf
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Experimental study of the near-field impact of an oyster table on the flow ArchiMer
Kervella, Youen; Germain, Gregory; Gaurier, Benoit; Facq, Jean-valery; Cayocca, Florence; Lesueur, Patrick.
Oyster farming structures are artificial obstacles which disturb tidal flow and wave propagation. These effects can induce modifications of erosion and sedimentation patterns, turbidity changes, local silting up and can be threatening for the shellfish farming itself. The understanding of the impact of these structures in terms of hydrodynamics and sediment dynamics in the far-field, i.e. at the scale of a bay, is a very challenging task. In order to investigate the far-field impact, it is very important to understand in the first place all the changes which occur at a smaller scale, i.e. at the scale of a single table for a farm consisting of oyster tables made of metallic wire structures on which porous bags of oysters are laid. This work is carried out...
Tipo: Text Palavras-chave: Sediment dynamics; Roughness length; Boundary layer; Particle Image Velocimetry; Laser Doppler Velocimetry; Flume; Oyster table.
Ano: 2010 URL: http://archimer.ifremer.fr/doc/2010/publication-7389.pdf
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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) ArchiMer
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
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In situ record of sedimentary processes near the Rhone River mouth during winter events (Gulf of Lions, Mediterranean Sea) ArchiMer
Marion, C.; Dufois, Francois; Arnaud, Mireille; Vella, C..
The environment is impacted by natural and anthropogenic disturbances that occur at different spatial and temporal scales, and that lead to major changes and even disequilibria when exceeding the resiliency capacities of the ecosystem. With an annual mean flow of 1700 m(3) s(-1), the Rhone River is the largest of the western Mediterranean basin. Its annual solid discharges vary between 2 and 20 Mt, with flood events responsible for more than 70% of these amounts. In the marine coastal area, close to the mouth, both flocculation and aggregation lead to the formation of fine-grained deposits, i.e. the prodelta. This area is characterized by sediment accumulation rates up to 20-50 cm yr(-1) and high accumulations of particle reactive contaminants such as...
Tipo: Text Palavras-chave: Sediment dynamics; Floods; Hydrodynamics; Radiotracers; Rhone River prodelta.
Ano: 2010 URL: http://archimer.ifremer.fr/doc/00006/11695/8479.pdf
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Influence des apports fluviatiles en Baie de Seine ArchiMer
Avoine, J; Crevel, L.
Hydrological study of Seine Bay displays two areas differentiated by salinity distribution. One has marine characteristics and the other is under fluvial influence. In this paper the authors give the main results of exchanges between the environments, obtained by the study of water dilution, solid particles dispersion, and their contribution to sedimentation.
Tipo: Text Palavras-chave: Estuarine front; River plumes; Trace metals; Salinity; Residual flow; Seasonal variations; Environmental effects; Sediment dynamics; Estuarine sedimentation; River discharge.
Ano: 1985 URL: http://archimer.ifremer.fr/doc/1985/acte-1275.pdf
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Influence of morphological changes on suspended sediment dynamics in a macrotidal estuary: diachronic analysis in the Seine Estuary (France) from 1960 to 2010 ArchiMer
Grasso, Florent; Le Hir, Pierre.
Estuaries are subject to extensive morphological changes through human activities, such as deepening and narrowing via dredging and channelization. The estuary sediment load, characterised by the estuarine turbidity maximum (ETM), can severely increase in response to channel deepening, shifting the estuary from a natural to hyperturbid state. The main processes driving the estuarine circulation, hydrology and sediment dynamics are relatively well known. However, their relative influence on suspended sediment concentration (SSC), as well as their role in the transition toward hyperturbid estuaries, is still a subject of debate. Therefore, this study aims at investigating the relative contribution of key estuarine drivers (gravitational circulation and tidal...
Tipo: Text Palavras-chave: Estuary deepening and narrowing; Sediment dynamics; Turbidity maximum; Tidal asymmetry; Stratification; Numerical modelling; Morphological changes.
Ano: 2019 URL: https://archimer.ifremer.fr/doc/00479/59046/65965.pdf
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Investigating Rhône River plume (Gulf of Lions, France) dynamics using metrics analysis from the MERIS 300m Ocean Color archive (2002 − 2012) ArchiMer
Gangloff, Aurelien; Verney, Romaric; Doxaran, David; Ody, Anouck; Estournel, Claude.
In coastal environments, river plumes are major transport mechanisms for particulate matter, nutriments and pollutants. Ocean colour satellite imagery is a valuable tool to explore river turbid plume characteristics, providing observations at high temporal and spatial resolutions of suspended particulate matter (SPM) concentration over a long time period, covering a wide range of hydro-meteorological conditions. We propose here to use the MERIS-FR (300 m) Ocean Colour archive (2002–2012) in order to investigate Rhône River turbid plume patterns generated by the two main forcings acting on the north-eastern part of the Gulf of Lions (France): wind and river freshwater discharge. Results are exposed considering plume metrics (area of extension,...
Tipo: Text Palavras-chave: River plume metrics; Sediment dynamics; MERIS; Ocean color data; Suspended particulate matter; Gulf of Lions.
Ano: 2017 URL: http://archimer.ifremer.fr/doc/00391/50258/50885.pdf
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La dynamique sedimentaire en Baie de Seine nord-orientale, fluctuations et evolution de la couverture meuble ArchiMer
Crevel, L.
This paper summarizes the main results obtained by the author at the time of his thesis. Sediment granulometry, composition and distribution are exposed in the first part. The use of factor analysis on sediment samples allows for the classification of soft sediments and to study its evolution during one and several years. Since 1978, the north-eastern Seine Bay sedimentation seems to be stable for all fluctuations and slitting in Antifer oil terminal.
Tipo: Text Palavras-chave: Statistical models; Temporal variations; Granulometry; Cohesionless sediments; Sediment dynamics.
Ano: 1985 URL: http://archimer.ifremer.fr/doc/1985/acte-1283.pdf
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Modelling the effects of macrofauna on sediment transport and bed elevation: Application over a cross-shore mudflat profile and model validation ArchiMer
Orvain, Francis; Le Hir, Pierre; Sauriau, Pierre-guy; Lefebvre, Sebastien.
Tipo: Text Palavras-chave: Modelling; Sediment dynamics; Erodability; Bioturbation; Macrofauna; Biota; Sediment stability.
Ano: 2012 URL: http://archimer.ifremer.fr/doc/00079/19055/18610.pdf
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Observed and predicted vertical suspended sediment concentration profiles and bedforms in oscillatory-only flow OMA
Williams, J.J.; Bell, P.S.; Thorne, P.D.; Trouw, K.; Hardcastle, P.J.; Humphrey, J.D..
Measurements of hydrodynamic conditions and vertical suspended sediment concentration profiles, C-profiles, have been obtained above rippled sandy beds in a large wave flume. Measured values of wave height and period, water depth and sediment properties are used in well-known formulae to predict sediment dynamics and bed shear stresses due to waves. These data are then used in an existing convective model and a new model to predict C-profiles. Measured C-profiles and C-profiles predicted by the new model are shown to agree well for a range of grain sizes and wave conditions. Grain-scale bed roughness, defined using data from the model, is found to vary with the wave mobility number. Values for the wave mixing coefficient derived using the new model are...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Benthic boundary layer; Flow; Flow; Flow; Model studies; Oscillatory flow; Resuspended sediments; Sand; Sediment dynamics; Vertical profiles; Waves; Waves.
Ano: 2000 URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=7388
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