Consulta: subjectFacets:"Sedimentation"
Registros recuperados: 55
Data/hora: 01/06/2024 10:39:02

Sensoriamento Remoto para a Caracterização do Aporte de Sedimentos e Compostos Orgânicos da Represa de Paraibuna, São Paulo.
Provedor de dados: 25
Autores: Dias, Nelson Wellausen; Batista, Getulio; Targa, Marcelo dos Santos; Novo, Evlyn Marcia Leão Moraes; Barbosa, Claudio Clemente.
As águas do rio Paraíba do Sul apresentam um alto nível de degradação ambiental em função do despejo direto de efluentes domésticos sem tratamento e de contaminações de origem difusa (sedimentos, nutrientes e matéria orgânica) provenientes do carreamento de solo erodido, fertilizantes, pesticidas, herbicidas e dejetos de animais para os canais de drenagem. Comparativamente, a água do reservatório de Paraibuna possui qualidade de água significativamente superior aos demais trechos do Rio Paraíba do Sul devido ao fato de estar a montante dos principais centros urbanos do Vale do Paraíba. Entretanto as águas que abastecem esta represa são provenientes de duas bacias (Paraibuna e Paraitinga) com características de cobertura e uso do solo bastante distintas que...
Tipo: Article
Palavras-chave: Represas; Sedimentação; Sensoriamento remoto hiperespectral; Hyperspectral remote sensing; Reservoirs; Sedimentation.
Ano: 2006
URL: http://hdl.handle.net/2315/41

Erosão na Bacia do Alto Taquari.
Provedor de dados: 14
Autores: GALDINO, S.; VIEIRA, L. M.; SORIANO, B. M. A.
O Rio Taquari; Erosão; Fatores naturais condicionantes da erosão laminar na BAT; Chuvas; Solos; Relevo; Potencial erosivo da BAT; Expansão da agropecuária na BAT; Uso das terras e perdas de solo na BAT em 1994; Uso das terras; Perda de solo; Causas das erosões na BAT; Aporte de sedimentos da BAT para o Pantanal; Recomendações para redução das erosões na BAT; Aprimoramento da base de dados sobre erosão; Identificação das áreas com maior risco/incidência de erosão; Monitoramento da erosividade das chuvas; Monitoramento do aporte de sedimentos para o Pantanal; Identificação e transferência de tecnologias alternativas para recuperação e manejo de pastagens; Capacitação em tecnologias de redução de erosão; Implementação de um programa integrado de manejo de...
Tipo: Documentos (INFOTECA-E)
Palavras-chave: Assoreamento; Bacia do Alto Taquari; Brasil; Erosion; Sedimentation; Taquari river basin.; Erosão; Impacto Ambiental; Sedimento.; Brazil; Pantanal; Environmental impact.
Ano: 2003
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/799064

Características e alterações limnológicas na Bacia do Rio Taquari, MS.
Provedor de dados: 14
Autores: OLIVEIRA, M. D. de; CALHEIROS, D. F.
Considerando os usos gerais dos principais sistemas aquáticos no Brasil, os impactos causados por processos de erosão/assoreamento são pontos importantes a serem considerados em programas de pesquisa, básica e aplicada, na área de Limnologia, devido a sua importância na alteração da qualidade da água.O aumento do aporte de material em suspensão, além de causar assoreamento dos rios, altera as características físicas e químicas da água, modificando a qualidade óptica da água e a temperatura (Alabaster &amp; Lloyd, 1982). O sedimento em suspensão pode aderir à superfície dos ovos de peixes, impedindo as trocas de oxigênio e dióxido de carbono, aderir às brânquias e prejudicar as funções de respiração e excreção, e depositar-se cobrindo plantas e locais de...
Tipo: Circular Técnica (INFOTECA-E)
Palavras-chave: Alteração; Característica; Assoreamento; Impacto; Rio Taquari; Characteristic; Sedimentation; Impact; Taquari river.; Água; Limnologia.; Pantanal; Limnology; Water.
Ano: 2002
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/810731

Evolucao da erosividade das chuvas na Bacia do Alto Taquari.
Provedor de dados: 14
Autores: SORIANO, B. M. A.; CLARKE, R. T.; GALDINO, S.
O assoreamento do rio Taquari constitui hoje um dos mais graves e discutidos problemas de impacto ambiental e socio economicos do Pantanal. Apesar do rio Taquari, historicamente, transportar grande quantidade de sedimento, a partir do final da decada de 70 esse processo foi intensificado com a expansao da atividade agropecuaria na Bacia do Alto Taquari (BAT). Outro fator importante no aumento do aporte de sedimento para o Pantanal pode estar relacionado a mudanca no regime pluviometrico na BAT. O calculo do indice mensal de erosividade da chuva foi efetuado para dois periodos: de 1969/70 a 1972/73 (periodo 1) e de 1973/74 A 1987/88 (periodo 2), utilizando o metodo de Lombardi Neto. Foram selecionadas cinco estacoes pluviometricas localizadas na BAT que...
Tipo: Boletim de Pesquisa e Desenvolvimento (INFOTECA-E)
Palavras-chave: Assoreamento; Rio Taquari; Regime pluviometrico; Mudanca; Sedimentation; Erosion; Taquari River; Rain regime; Change; Wetland.; Chuva; Desmatamento; Erosão.; Pantanal; Deforestation; Rain.
Ano: 2001
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/809810

Open-air treatment of wastewater from land-based marine fish farms in extensive and intensive systems: current technology and future perspectives
Provedor de dados: 5
Autores: Hussenot, Jerome; Lefebvre, Sébastien; Brossard, Nicolas.
Marine land-based fish farms located in coastal wetlands (salt-pond zones, lagoon banks, etc.), whether extensive or intensive, send farm effluents directly to the sea or after short periods of stocking in retention reservoirs. The aims of our investigation have been to compare the efficiency of current and potential water treatment procedures in open-air. Wastewater retention ponds in commercial farms (Atlantic coasts of France) are efficient in removing up to 1 metric ton of particulate material (dry weight) per hectare and per day (faeces and unconsumed feed), but are inefficient in reducing dissolved wastes, both organic (urea, amino acids, protein) and inorganic (total ammonia nitrogen, phosphates). Forthcoming outdoor technology to treat these forms...
Tipo: Text
Palavras-chave: Traitement de l'eau; Effluent; Décantation; Sédimentation; Écumage; Microalgue; Huître; Water treatment; Effluent; Aquaculture; Sedimentation; Foam fractionation; Microalgae; Oyster.
Ano: 1998
URL: https://archimer.ifremer.fr/doc/1998/publication-873.pdf

Neogene evolution of the mixed carbonate-siliciclastic system in the Gulf of Papua, Papua New Guinea
Provedor de dados: 5
Autores: Tcherepanov, Evgueni N.; Droxler, Andre W.; Lapointe, Philippe; Dickens, Gerald R.; Bentley, Sam J.; Beaufort, Luc; Peterson, Larry C.; Daniell, James; Opdyke, Bradley N.
This paper outlines the evolution of the late Cenozoic mixed carbonate-siliciclastic depositional system in the Gulf of Papua (GoP), using seismic, gravity, multibeam bathymetry, well data sets, and Landsat imagery. The deposition of the mixed sedimentary sequences was influenced by dynamic interplay of tectonics, eustasy, in situ carbonate production, and siliciclastic sediment supply. The roles of these major factors are estimated during different periods of the GoP margin evolution. The Cenozoic mixed system in the GoP formed in distinct phases. The first phase ( Late Cretaceous-Paleocene) was mostly driven by tectonics. Rifting created grabens and uplifted structural blocks which served later as pedestals for carbonate edifices. Active neritic...
Tipo: Text
Palavras-chave: Great barrier reef; Sea level; Tectonic controls; Ice volume; Platforms; Sedimentation; Fluctuations; Deposition; Australia; Foreland basin.
Ano: 2008
URL: https://archimer.ifremer.fr/doc/00208/31939/30357.pdf

Triggering mechanisms of slope instability processes and sediment failures on continental margins: a geotechnical approach
Provedor de dados: 5
Autores: Sultan, Nabil; Cochonat, Pierre; Canals, M; Cattaneo, Antonio; Dennielou, Bernard; Haflidason, H; Laberg, J; Long, D; Mienert, J; Trincardi, F; Urgeles, R; Vorren, T; Wilson, C.
The Costa target areas exhibit the variability of slope instabilities needed to improve our understanding of sediment physical and mechanical properties in areas prone to sliding. That is why in this project, we have analysed the different slope failures events from different parts of the Costa target areas, which reflect diverse triggering mechanisms. The aim of the first part of this study was to identify the geotechnical response of the sediment to different external mechanisms (earthquake, rapid sedimentation and gas hydrate melting). We have focused on the relation between external mechanisms and the consequence change in the in-situ stress state and the physical, mechanical, and elastic properties of the sediment. In the second part of the paper, the...
Tipo: Text
Palavras-chave: Slope instability; Sensitivity; Sedimentation; Hydrate; Earthquake.
Ano: 2004
URL: http://archimer.ifremer.fr/doc/2004/publication-700.pdf

Width variation around submarine channel bends: Implications for sedimentation and channel evolution
Provedor de dados: 5
Autores: Palm, Franziska A.; Peakall, Jeff; Hodgson, David M.; Marsset, Tania; Silva Jacinto, Ricardo; Dennielou, Bernard; Babonneau, Nathalie; Wright, Tim J.
Submarine-fan channels can build the largest sediment accumulations on Earth, but our understanding of flow and sedimentation processes related to channel evolution remains limited. Results from physical and numerical modelling predict dominantly downstream channel bend migration. However, observations and evolutionary models for aggradational submarine channels on passive margins suggest that bends are dominated by lateral expansion. This paradox may be due to limitations induced by the use of constant width channels in process studies. Constant width has been used for two reasons: partly because this is the simplest possible case, but primarily because the width variation around submarine channel bends is unknown. Channel width variations are examined...
Tipo: Text
Palavras-chave: Submarine channel; Congo; Channel morphology; Sedimentation; Bank pull; Quaternary; Monsoon; South Atlantic.
Ano: 2021
URL: https://archimer.ifremer.fr/doc/00693/80473/83602.pdf

Bioturbation at the water-sediment interface of the Thau Lagoon: impact of shellfish farming
Provedor de dados: 5
Autores: Schmidt, Sabine; Gonzalez, Jean-louis; Lecroart, Pascal; Tronczynski, Jacek; Billy, Isabelle; Jouanneau, Jean-marie.
Quantifier les processus de remaniement sédimentaire procure une vision nouvelle du fonctionnement des écosystèmes benthiques de l'étang de Thau, lieu d'une importante production ostréicole. Afin d'évaluer les taux de bioturbation des sédiments de surface, des profils de deux traceurs radioactifs, le béryllium 7Be (T1/2 = 53 jours) et le thorium 234Th (T1/2 = 24.1 jours) ont été mesurés à partir de carottes sédimentaires prélevées entre décembre 2001 et décembre 2006. La sélection de plusieurs sites a permis de couvrir la diversité de l'étang de Thau : C4, T10, et T11 dans le bassin central, C5, T7 et T8 au niveau des secteurs ostréicoles, T2 et T4 à l'ouest du bassin, et T12 à l'est près de la zone industrielle. Le 234Th en excès (234Thxs ; i.e. apporté...
Tipo: Text
Palavras-chave: Mediterranean Lagoon; Radionuclides; Biodeposition; Sedimentation.
Ano: 2007
URL: http://archimer.ifremer.fr/doc/2007/publication-2584.pdf

Deep water geomorphology of the mixed siliciclastic-carbonate system, Gulf of Papua
Provedor de dados: 5
Autores: Francis, Jason M.; Daniell, James J.; Droxler, Andre W.; Dickens, Gerald R.; Bentley, Samuel J.; Peterson, Larry C.; Opdyke, Bradley N.; Beaufort, Luc.
The Gulf of Papua (GoP) has become a focal point for understanding the deposition and accumulation of siliciclastic and carbonate material along and across a low-latitude continental margin. Although studies have addressed submarine geomorphological features on the inner and middle shelves, as well as processes that may have led to their formation, the seafloor of adjacent slope regions remains poorly documented. This study presents and interprets results from approximately 13,000 line-km of multibeam bathymetry, 9500 line-km of 3.5 kHz seismic, and 122 sediment cores that were collected from the GoP shelf edge and slope, primarily on two cruises (PANASH and PECTEN). Bathymetric maps, in conjunction with the seismic profiles and cores, were used to make...
Tipo: Text
Palavras-chave: Great barrier reef; New Guinea; Platform margin; Foreland basin; OF Papua; Sedimentation; Shelf; Bank; Circulation; Australia.
Ano: 2008
URL: https://archimer.ifremer.fr/doc/00208/31938/30356.pdf

Interrelations entre des communautes mixtes de bacteries anaerobies isolees de sediments marins
Provedor de dados: 5
Autores: Marty, D.
The mineralization of cellulose was examined in mono and cocultures of marine anaerobic bacteria (cellulolytic bacteria, fermentative non-cellulolytic bacteria and methane-producing bacteria). These studies displayed interactions between these groups of microorganisms: inhibition relationships (inhibition of methanogens during active growth of fermentative bacteria) and syntrophic relationships (growth of fermentative non-cellulolytic bacteria depended on metabolites produced by cellulolytic bacteria; increased in rate of cellulose hydrolysis in presence of fermentative non-cellulolytic bacteria; interspecies H sub(2) transfer reaction between fermentative bacteria and methane-producing bacteria).
Tipo: Text
Palavras-chave: Biogeochemistry; Sedimentation; Sediments; Fermentation; Mineralization; Cellulose; Methanogenesis; Interspecific relationships; Anaerobic bacteria.
Ano: 1984
URL: http://archimer.ifremer.fr/doc/1984/acte-948.pdf

Particules en suspension dans la Baie de Seine: Concentration et sedimentation instantanee en periode d''etiage
Provedor de dados: 5
Autores: Brun, C; Benbrahim, M.
Granulometry, density estimation, massic charge, sedimentary flux of suspensions and time of suspended forms are the different parts of this report. The studies have taken place during low-water levels and don't take into consideration the effects of storms and floods.
Tipo: Text
Palavras-chave: Density; Granulometry; Low tide; Sedimentation; Particle concentration; Suspended particulate matter.
Ano: 1985
URL: http://archimer.ifremer.fr/doc/1985/acte-1279.pdf

Fonctionnement des marais maritimes atlantiques: échanges d'énergie et effets des flux aquacoles diffus
Provedor de dados: 5
Autores: Bel Hassen, Malika.
French estuaries, from the Atlantic coast to the English channel, have been characterized by a poor phytoplankton biomass. The turbidity has always been considered as the limiting factor for phytoplankton. Estuarine ecosystems are situated at the boundary between the land and the sea. Consequently, they are subject to an enrichment by nutrient loadings from upland ecosystems. Although it has been demonstrated that a part of the nutrient loadings support an important benthic production. The part, which escapes to the estuarine benthic and planktonic food web and is exported to adjacent estuarine ecosystems, still remains undetermined. Quantifying the nu trient and particulate matter exchange between a macrotidal Bay, the Fier d'Ars, and the adjacent ocean...
Tipo: Text
Palavras-chave: Aquaculture; Exportation; Matière dissoute; Fiers d'Ars; Systèmes d'Information Géographique; Importation; Usages; Lumière; Micorphytobenthos; Modélisation; Nutriments; Matière organique; Matière particulaire; Phytoplancton; Sédimentation; Aquaculture; Export; Dissolved matter; Fier d'Ars Bay; Geographic Information Systems; Import; Land use; Light; Microphytobenthos; Modelling; Nutrients; Organic matter; Particulate matter; Phytoplankton; Sedimentation.
Ano: 2000
URL: http://archimer.ifremer.fr/doc/00450/56185/57738.pdf

Le comblement de la ria de Gernika (golfe de Gascogne) à l'Holocène terminal
Provedor de dados: 5
Autores: Pascual, A; Weber, O; Rodriguez-lazaro, J; Jouanneau, Jm; Pujos, M.
A study of the recent sedimentation of the ria de Gernika (Bay of Biscay) is undertaken to characterise different steps of its Holocene filling. Sedimentological and micropalaeontological analysis of six cores sampled in the ria, completed with absolute dating (C-14, and based upon Pb-210 exc.), allow us to identify three phases in the filling of the ria that are Limited by two transgressive shifts (3500 and 2500 yr. B.P.) already described in other areas of the Bay of Biscay. In the first phase, lithologies as well as benthic foraminifera and ostracode assemblages are typical of coastal marine palaeo-environment. During the second phase the euryhaline waters progessively occupy the central area of the estuary. Here the presence of allochthonous...
Tipo: Text
Palavras-chave: Microfaune; Sédimentation; Holocène terminal; Ria de Gernika; Microfauna; Sedimentation; Late Holocene; Ria de Gernika.
Ano: 1998
URL: http://archimer.ifremer.fr/doc/00326/43684/43237.pdf

Evolutions quantitatives et qualitatives du seston dans une claire à huîtres : relation avec la sédimentation et la biodéposition
Provedor de dados: 5
Autores: Sornin, Jean-marc; Delmas, Daniel; Deslous-paoli, Jean-marc.
Dans un bassin aquacole fermé (claires à huîtres), l'évolution qualitative et quantitative des matières en suspension subit des variations saisonnières directement liées aux capacité de production planctonique. Ainsi, à la fin du printemps et en été, le réchauffement des eaux s'accompagne d'une augmentation de matière organique importante (jusqu'à 17 mg.1(-1). Pendant cette période, la sédimentation naturelle est supérieure à 350 g.m(-2).j(-1). La biodéposition (fèces + pseudofèces) suit l'évolution des capacités de rétention des huîtres. Dans ce type de bassin fermé, cette capacité est liée à la qualité des matières en suspension. En période estivale, les fortes teneurs en matière organique du seston (entre 5 et 17 mg.1(-1)) dispensent les mollusques...
Tipo: Text
Palavras-chave: Crassostrea gigas; Oysters; Biodeposition; Sedimentation; Suspension; Particulate organic matter; Crassostrea gigas; Huîtres; Biodéposition; Sédimentation; Suspension; Matière organique particulaire.
Ano: 1987
URL: http://archimer.ifremer.fr/doc/1987/publication-7309.pdf

Biodiversity and distribution of bivalves on the Aquitain coast (Bay of Biscay, France)
Provedor de dados: 5
Autores: De Casamajor, Marie-noelle; Caill-milly, Nathalie; Morandeau, Gilles; Lissardy, Muriel.
Tipo: Text
Palavras-chave: Bivalves; Bathymetric distribution; Sedimentation; Exploitation; Aquitaine.
Ano: 2010
URL: http://archimer.ifremer.fr/doc/00066/17727/15235.pdf

The impact of the last European deglaciation on the deep-sea turbidite systems of the Celtic-Armorican margin (Bay of Biscay)
Provedor de dados: 5
Autores: Zaragosi, Sébastien; Bourillet, Jean-francois; Eynaud, Frédérique; Toucanne, Samuel; Denhard, Benjamin; Van Toer, Aurélie; Lanfumey, Valentine.
The compilation of results obtained on three giant piston cores from the Whittard, Shamrock and Guilcher turbidite levees reveals a high-resolution stratigraphic record for the Bay of Biscay. Due to the abundance of reworked sediments in these sedimentary environments, a specific methodological approach, based on an X-ray-assisted subsampling phase associated with sedimentological, geochemical and micropalaeontological analyses, was implemented. With an accurate chronological framework, this multi-proxy investigation provides observations on the 'Fleuve Manche' palaeoriver and the British-Irish Ice Sheet (BIS) histories over the last 20,000 years. The results obtained highlight the direct influence of the decay of the BIS on the Bay of Biscay deep-sea...
Tipo: Text
Palavras-chave: Sedimentation; Glaciation; Turbidity; Deep sea; Bay of Biscay; French Atlantic margin.
Ano: 2006
URL: http://archimer.ifremer.fr/doc/2006/publication-2142.pdf

Analysis of mixed-sediment consolidation experiments
Provedor de dados: 5
Autores: Grasso, Florent; Le Hir, Pierre; Bassoullet, Philippe.
Estuarine sediment transport models require that a time variation of erodibility due to consolidation be taken into account. If numerical modelling of mud sedimentation and consolidation is currently satisfactory, simulation of mud-sand mixture consolidation is more problematical. This is partly due to mixed-sediment processes, as hindered settling and segregation, not well understood yet. Hence, based on extensive settling columns experiments, the aim of this study is to improve our understanding of mud-sand mixture consolidation for varying concentrations (54 to 600 kg/m3) and large sand contents (15 to 80%). Firstly, we observed that for a given initial mass concentration and sand content the final consolidation appeared independent from the initial...
Tipo: Text
Palavras-chave: Settling column experiments; Consolidation; Sedimentation; Mud/sand mixtures; Sand segregation; Gelling concentration.
Ano: 2014
URL: http://archimer.ifremer.fr/doc/00206/31727/30129.pdf

Observations dans les zones peu accessibles de l'environnement bathyal (biologie et geologie) grace a l'usage des soucoupes plongeantes
Provedor de dados: 5
Autores: Roux, M.
On the bathyal slope for continental margins, steep and rocky substrates punctuated with cliffs and collapsing zones are frequently found. As survey and sampling with the classical technics from the sea surface is practically impossible in such an environment, in situ exploration with a submersible allows significant advances in ecology, with implications in paleoenvironment reconstruction. Mixing of material from shallow-water and deep-sea origins into bathyal sedimentation suggests that the so-called "fossil assemblages of outer platform" were frequently misinterpreted. Dense populations of animals closely related to fossil groups which were only considered as relict of the Past ("living fossils") and previously interpreted as shallow-water inhabitants...
Tipo: Text
Palavras-chave: Continental margins; Bathyal zone; Diving; Cruises; Sedimentation; Biomass; Geology; Biology; Imaging techniques; Image processing; Marine technology; Underwater photography; Submersibles.
Ano: 1990
URL: http://archimer.ifremer.fr/doc/1990/acte-1138.pdf

Importance et role du materiel organique vivant et inerte dans les suspensions de la Baie de Seine
Provedor de dados: 5
Autores: Dupont, J; Lafite, R.
Living and inert organic matter take an important place inside suspensions in Seine Bay. There particulate matter and the organo-mineral particles can induce granulometric modes, which constitute a determinant component for dynamics characterizing of suspensions. Organic fraction, in particular, plankton (diatoms and zooplankton) is a main factor in open sea which can concentrate when coming into contact with mass water fronts. Organo-mineral aggregates are present in all estuaries. Importance and action of this organic particulate matter are studied for a best knowledge of this ecosystem.
Tipo: Text
Palavras-chave: Zonal distribution; Estuaries; Species diversity; Plankton; Suspended inorganic matter; Sedimentation; Hydrodynamics; Suspended organic matter.
Ano: 1985
URL: http://archimer.ifremer.fr/doc/1985/acte-1278.pdf

Heterogeneity of sediments and settling particles in aerated ponds
Provedor de dados: 5
Autores: Kassila, Jawad; Hussenot, Jerome.
A study was conducted in seabass (Dicentrarchus labrax) and oyster (Crassostrea gigas) ponds to assess the levels of heterogeneity of sediments and settling particles. The intensity of sampling to estimate with high accuracy some characteristics will depend on the magnitude of the variation within the population under consideration. Several variables, such as total phosphate (Tot-P), total iron (Tot-Fe), total ammonium nitrogen (TAN), organic carbon (Org-C), total nitrogen (Tot-N) and P fractions were analysed during the rearing period. The box-and-whisker plots were used as graphical/statistical tools to visualize the descriptive statistical characteristics of the data. In the fish pond, the sediments have high concentrations of Tot-P, Tot-Fe and TAN in...
Tipo: Text
Palavras-chave: Sampling strategy; Resuspension; Sedimentation; Artificial aeration; Particles; Sediment.
Ano: 2006
URL: http://archimer.ifremer.fr/doc/2006/publication-1224.pdf

Matière en suspension et sédimentation dans la lagune de Thau
Provedor de dados: 5
Autores: Pichot, Paul; Deslous-paoli, Jean-marc; Juge, Claude.
Thau is a mediterranean lagoon with a large productive stock of molluscs (oysters, mussels) cultivated on suspended tines and colonised by epibionta (ascidia and others invertebrates, algae, etc ... ). This study was developed as part of the PNOC-OXYTHAU.programme. Its aim was to analyze the effects of oyster farrning on water-mass surrounding structures loaded with suspended molluscs and proximal watermass separating these structures. This study concems particulate suspended matter and deposits of particulate organic matter on the bottom after sedimnentation. Biochemical measurements were carried out for nitrogen, carbon,  proteins, lipids and carbohydrates. ln order to estimate sedimentaton, bottom sediment traps were used
Tipo: Text
Palavras-chave: Méditérranée; Etang de Thau; Matière en suspension; Azote; Carbone; Protites; Lipides; Glucides; Sédimentation; Mediterranean; Lagoon of Thau; Particulate suspended mattter; Nitrogen; Carbon; Proteins; Lipids; Carbohydraes; Sedimentation.
Ano: 1996
URL: http://archimer.ifremer.fr/doc/00425/53662/54501.pdf

Population dynamics of the migratory fish Prochilodus lineatus in a neotropical river: the relationships with river discharge, flood pulse, El Niño and fluvial megafan behaviour
Provedor de dados: 83
Autores: Stassen,Marinke J. M.; van de Ven,Max W. P. M.; van der Heide,Tjisse; Hiza,Marco Antonio Guerrero; van der Velde,Gerard; Smolders,Alfons J. P.
The relative importance of flood pulse dynamics and megafan behaviour for the Sábalo (Prochilodus lineatus) catches in the neotropical Pilcomayo River is studied. The Sábalo catches can mainly be explained by decreased river discharges in the preceding years resulting in smaller inundated areas during rainy season floods and thereby in a decreased area of feeding grounds for the fishes. The decreased river discharges and the related decline of Sábalo catches in the 1990's can be linked to the 90-95 El Niño event. In 2007 the Sábalo catches were comparable to the catches before the "El Niño" event. The connectivity (continuity) between the main river and flood plain areas, which is influenced by sedimentation processes, is also of great importance and very...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Sedimentation; Climate change; Sábalo; Gonadal development; Flood Pulse Concept.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252010000100014

The Low Sedimentation Speed of Cryptosporidium Oocysts : A Further Explanation for Waterborne Outbreaks
Provedor de dados: 19
Autores: Sréter, T.; Széll, Z.
Palavras-chave: Cryptosporidium parvum; C. muris; C. baileyi; Cryptosporidiosis; Waterborne transmission; Sedimentation.
Ano: 1998
URL: http://ir.obihiro.ac.jp/dspace/handle/10322/278

Das Typus-Profil der Morrocoyal-Formation (Unterlias; Depto. Bolivar, Kolumbien).
Provedor de dados: 20
Autores: Geyer, O.F.
Se describe el perfil típico de la formación Morrocoyal. La fauna de amonitas define la edad de las capas como la parte superior del Sinemuriano Inferior. La biofacies manifiesta condiciones de aguas someras hasta neríticas durante el tiempo de sedimentación. Se discuten las relaciones regionales de la formación.
Tipo: Journal Contribution
Palavras-chave: Geology; Sedimentation; Geology; Sedimentation; Http://aims.fao.org/aos/agrovoc/c_3232; Http://aims.fao.org/aos/agrovoc/c_6926.
Ano: 1967
URL: http://hdl.handle.net/1834/3326

Isla Arena, una formación coralina saludable en el área de influencia de la pluma del Río Magdalena, plataforma continental del Caribe colombiano.
Provedor de dados: 20
Autores: Pinzón, J.H.; Perdomo, A.M.; Díaz, J.M.
Se describe la morfología, composición y estructura de la formación coralina desarrollada alrededor de Isla Arena, un pequeño islote localizado en la zona central de la plataforma continental del Caribe colombiano. A partir de fotografías aéreas del área y observaciones en el campo, se elaboraron mapas batimétricos, de las unidades de fondo, de acuerdo al sustrato y a la cobertura de la biota sésil dominante, del grado de exposición al oleaje y de sus patrones de dispersión y refracción. Mediante el empleo de una cámara de video submarina, se filmaron transectos a lo largo de una cadena de 10 m, que fueron analizados usando el método de punto intersectado para la caracterización de la estructura de la comunidad de organismos sésiles. Un total de 33...
Tipo: Journal Contribution
Palavras-chave: Coral; Sedimentation; Sedimentation; Http://aims.fao.org/aos/agrovoc/c_6926.
Ano: 1998
URL: http://hdl.handle.net/1834/3275

Características estratigráficas y morfodinámicas de la franja litoral Caribe colombiana (Sector Barranquilla (Bocas de Ceniza) - Flecha de Galerazamba)
Provedor de dados: 20
Autores: Molina-M., A.; Molina-M., C.; Giraldo-O., L.; Barrera-O., R.
The geologic (stratigraphic) and morphodynamic characteristics throughout 76 km of the coastal profile of the Colombian Caribbean, including those between Barranquilla (Bocas de Ceniza) and the spit of Galerazamba are described. The sections of the coast that have been affected by erosive events and those with sedimentary accretion are described. Some of them are associated to both natural and anthropic phenomena. Geologically, the coastal edge is defined by sedimentary rocks, weakly consolidated sediments and inconsolidated sediments, that include ages from the upper Paleocene to the Recent. From the point of view of the evaluation of the coast in terms of stability and instability, the high coasts are classified as: Critic zones (Punta Sabanilla,...
Tipo: Journal Contribution
Palavras-chave: Stratigraphy; Coastal zone; Erosion; Sedimentation; Stratigraphy; Erosion; Sedimentation; Http://aims.fao.org/aos/agrovoc/c_7440; Http://aims.fao.org/aos/agrovoc/c_2651; Http://aims.fao.org/aos/agrovoc/c_6926.
Ano: 1999
URL: http://hdl.handle.net/1834/3433

Efecto acumulativo de agentes estresantes múltiples sobre  los corales hermatípicos de la región noroccidental de Cuba
Provedor de dados: 20
Autores: González Díaz, S. P.
En las últimas décadas ha ocurrido un deterioro acelerado de los arrecifes de coral debido al  efecto sinérgico de impactos naturales y antrópicos. En consecuencia, el objetivo de la tesis  es evaluar los efectos acumulativos producidos por agentes estresantes múltiples y que  impactan de forma simultánea los corales hermatípicos. Para ello se estimaron indicadores  ecológicos en los niveles de comunidad y población. Los resultados obtenidos en esta  investigación evidencian cambios en la estructura de las comunidades de corales que se  asocian con el impacto antrópico directo existente a lo largo de la costa noroccidental de  Cuba y que disminuye en la dirección este-oeste. Los indicadores ecológicos referidos a las  tallas de los corales, muestran...
Tipo: Theses and Dissertations
Palavras-chave: Coral reefs; Agents; Sedimentation; Eutrophication.
Ano: 2010
URL: http://hdl.handle.net/1834/5385

Uber ein holozänes Korallen- und Mangrovenvorkommen nahe Santa Marta, Kolumbien
Provedor de dados: 20
Autores: Erfa, A.v.; Geister, J.
En el mes de nov./1969 olas larga procedentes de un huracán en el NW del Mar Caribe causaron temporalmente la erosión de la "Punta la Loma", una punta de arena situada en la playa frente al aeropuerto Simón Bolívar de Santa Marta. Como resultado de este suceso afloró el sustrato de esta punta, el cual esta formado de una granodiorita encrustada por corales arrecifales y cubierta por una arena cementada. En la fauna coralina están presentadas solamente especies recientes conocidas de la costa colombiana del Caribe. También se encontraron algunos moluscos y abundantes restos litificados de raíces de mangles.
Tipo: Journal Contribution
Palavras-chave: Coral; Geology; Stratigraphy; Sedimentation; Mangroves; Ecosystems; Geology; Stratigraphy; Ecosystems; Sedimentation; Mangroves; Http://aims.fao.org/aos/agrovoc/c_3232; Http://aims.fao.org/aos/agrovoc/c_7440; Http://aims.fao.org/aos/agrovoc/c_2482; Http://aims.fao.org/aos/agrovoc/c_6926; Http://aims.fao.org/aos/agrovoc/c_16190.
Ano: 1976
URL: http://hdl.handle.net/1834/3299

Environmental effects of Coastal Sedimentation: A Case study fo Shirazi-Funzi Lagoon
Provedor de dados: 20
Autores: Munyao, T.M.
Shirazi-Funzi Lagoon is situated about 70km Southwest of Mombasa. It occurs within longitudes 39°22'E and 39°27'E, and latitudes 4°30'S and 4°35'S and covers about 57km2. The study area lies in the coastal plain, wich is below the 30m contours, and is underlain by coral limestone of the Pleistocene age, and lagoonal deposits from both land and sea. Both the hinterlands at Shirazi and the Funzi Island are underlain by the MtoMkuu formation of upper and lower Cretaceous, of the Post Karoo systems. This formation is overlain by Pleistocene sands that cover the Funzi Island and a narrow strip of the coastline immediately north of Funzi Island.
Tipo: Report
Palavras-chave: Sedimentation; Coastal zone.
Ano: 1993
URL: http://hdl.handle.net/1834/334

Factors controlling the total alkalinity in the Arabian Sea and Red Sea
Provedor de dados: 20
Autores: Elageed, Salma.
Based on data obtained during the Geochemical Ocean Section Study (GEOSECS)1977, Mer Rouge (MEROU) 1982, and US Joint Global Ocean Flux (JGOFS)1995 studies we have analyzed the processes controlling the total alkalinity (TA) of the whole water column in the Arabian Sea and the Red Sea. The main processes important for the TA variability in area of study are salinity variations, soft tissue production, calcium carbonate formation and dissolution, and sedimentation. For the subsurface waters different processes dominate in the different basins. Regarding spatial variations in surface TA, maximum values occur in the Red Sea and minimum in the upwelling region along the Omani coast in the Arabian Sea. These variations are mainly associated with physical...
Tipo: Theses and Dissertations
Palavras-chave: Alkalinity; Salinity; Sedimentation.
Ano: 2010
URL: http://hdl.handle.net/1834/4549

Morphotypes, structure trophique et état de maturité de la nématofaune de la lagune de Bizerte
Provedor de dados: 20
Autores: Mahmoudi, E.; Beyrem, H.; Boufahja, F.; Essid, N.; Hedfi, A.; Aissa, P.
Dix stations côtières ont été prospectées dans la lagune de Bizerte en hiver 2001 pour étudier l’impact des conditions environnementales sur les plans morphométrique, trophique et de maturité des nématodes méiobenthiques. Nos résultats montrent que la croissance en largeur des nématodes libres a été proportionnelle aux charges sédimentaires en fraction fine et en métaux et ce parallèlement à l’individualisation de quatre morphotypes nématologiques. D’autre part, la structure trophique de la nématofaune est liée à la turbidité et aux concentrations des eaux en nitrites. En effet, la proportion en détritivores sélectifs, principalement bactériophages, au sein des communautés nématologiques, est positivement corrélée à la concentration des eaux en nitrites et...
Tipo: Journal Contribution
Palavras-chave: Environmental effects; Feed composition; Indicator species; Pollution monitoring; Sedimentation; Sexual maturity; Turbidity; Nematoda; Environmental impact; Http://aims.fao.org/aos/agrovoc/c_5112; Http://aims.fao.org/aos/agrovoc/c_24420.
Ano: 2006
URL: http://hdl.handle.net/1834/4156

El Islote El Palmar, resultado de una evolución a largo plazo de la distribución del drenaje entre los Ríos Daule y Babahoyo en la Cuenca del Guayas
Provedor de dados: 20
Autores: Dumont, J.F.; Santana, E.; Soledispa, B.; King, A.
Se analizó la forma de la red de drenaje de la parte sur de la Cuenca del Guayas, desde Quevedo al norte hasta la confluencia de los ríos Daule y Babahoyo al sur. La idea de que la distribución del drenaje en la Cuenca del Guayas es variable y puede tener un efecto sobre la repartición de los caudales respectivos de los ríos Daule y Babahoyo, es basada en dos elementos, uno geológico y el otro histórico.
Tipo: Journal Contribution
Palavras-chave: Coastal morphology; Sedimentation; River basins; Rivers; Rivers; Sedimentation; River basins; Http://aims.fao.org/aos/agrovoc/c_6617; Http://aims.fao.org/aos/agrovoc/c_6926; Http://aims.fao.org/aos/agrovoc/c_6613.
Ano: 2007
URL: http://hdl.handle.net/1834/2366

Some ecological factors affecting coral reef assemblages off Hurghada, Red Sea, Egypt
Provedor de dados: 20
Autores: Mohamed, T.A.A.; Mohamed, A.M.
Three shallow reef sites were investigated during four seasons Autumn, 2003, Winter, Spring and Summer, 2004) off the Marine Biological Station at Hurghada, Red Sea, Egypt. Thirty-eight scleractinian coral species were recorded at the studied sites. Generally, Twenty-six species were affected by more than one factor (such as high temperature, solar radiation, sedimentation and algae), while the last twelve species remained healthy. The affected species (26 species) were divided into the following: five species were affected by combination of high temperature and direct exposure to solar radiation during the neap tide, eleven species only were affected by sedimentation and increasing algal cover and ten species were affected by high temperature, solar...
Tipo: Journal Contribution
Palavras-chave: Coral bleaching; Agal cover; Solar Radiation; Sea level; Sedimentation; Red Sea Sediments Coral reefs Ecology.
Ano: 2005
URL: http://hdl.handle.net/1834/1302

Efecto de la sedimentación en el reclutamiento de las macroalgas Dictyota spp. y Lobophora variegata: un estudio experimental en el Parque Nacional Natural Tayrona, Caribe colombiano
Provedor de dados: 20
Autores: Flórez-Leiva, L.; Rangel-Campo, A.; Díaz-Ruíz, M.; Venera-Pontón, D. E.; Díaz-Pulido, G.
La sedimentación está frecuentemente implicada como un factor clave en la degradación arrecifal. Sin embargo son pocos los estudios experimentales que evalúan este importante proceso en la dinámica del reclutamiento de las algas en los arrecifes coralinos. En un experimento de campo se manipularon los niveles de sedimentación y se examinaron los impactos en el reclutamiento y crecimiento de las macroalgas pardas Dictyota spp. y Lobophora variegata en dos bahías (Chengue y Granate) del Parque Nacional Natural Tayrona, Caribe colombiano. Se encontró una gran variabilidad de respuestas de las algas a la sedimentación, la cual dependió del nivel de sedimento empleado, tipo de alga estudiada y parámetro poblacional considerado (reclutamiento o crecimiento). La...
Tipo: Journal Contribution
Palavras-chave: Sedimentation; Coral reefs; Coral reefs; Sedimentation; Http://aims.fao.org/aos/agrovoc/c_1880; Http://aims.fao.org/aos/agrovoc/c_6926.
Ano: 2010
URL: http://hdl.handle.net/1834/3765

Estudio de los procesos relacionados con la presencia de plaguicidas organoclorados en la Ciénaga Grande de Santa Marta
Provedor de dados: 20
Autores: Betancourt, J.M.; Ramírez-Triana, G.
The aim of this paper is to have an approach to the phenomena that take place in the lagoon complex of the Ciénaga Grande de Santa Marta (CGSM), which are related to the behavior of the remaining organochloride pesticides. Besides discussing the depuration processes, precipitation/sedimentation and the damping that are present in this coastal lagoon; with an environmental managing scope. The results analyzed were those obtained from the project called “Monitoring of the environmental conditions and the structural and functional changes of the vegetal communities and fishing resources during the rehabilitation of the CGSM”. The main removal type in the CGSM water system for organochloride compounds in the water column, occurs by  recipitation/sedimentation...
Tipo: Journal Contribution
Palavras-chave: Coastal lagoons; Sedimentation; Degradation; Pesticides; Degradation; Pesticides; Coastal lagoons; Sedimentation; Http://aims.fao.org/aos/agrovoc/c_2159; Http://aims.fao.org/aos/agrovoc/c_5739; Http://aims.fao.org/aos/agrovoc/c_1697; Http://aims.fao.org/aos/agrovoc/c_6926.
Ano: 2005
URL: http://hdl.handle.net/1834/2018

Shore Morphology and Sediment Characteristics  South of Pangani River, Coastal Tanzania
Provedor de dados: 20
Autores: Shaghude, Y.W.
The shore morphology and nearshore sediments between the Pangani and Kipumbwi rivers were investigated to describe the shore and the reef platform sediments characteristics and also to update information on recent shoreline changes along the Tanzania mainland coast. The information gathered during this study comes from field observations, sediment sampling of the area and interviews with Pangani residents. The investigated area is a patch reef coast with narrow or no beaches and fossil reef terrace islands offshore, Pangani bay and estuary are among the most prominent shore features. Historical information indicates that, both the bay, and the estuary have undergone significant changes during the last 60 years. While the growth of the estuary has mainly...
Tipo: Preprint
Palavras-chave: Sedimentation; Coastal sediment; Sediments; Reefs; Shorelines; Sediment sampling.
Ano: 2004
URL: http://hdl.handle.net/1834/214

Effect of physico-chemical factors and human impacts on coral distribution at Tobia Kebir and Sharm el Loly, Red Sea, Egypt
Provedor de dados: 20
Autores: Ammar, M.S.A.; Mahmoud, M.A.
Using SCUBA equipment and the line intercept transect (LIT), the effect of physical factors and human impacts on coral distribution were studied in two Red Sea sites (Sharm El Loly and Tobia Kebir) throughout the period from September, 2003 to October, 2004. The percentage cover of coral species in Northern Sharm El Loly was higher than in Tobia Kebir which might be attributed to optimum temperature and better light intensity. Diving, swimming, boat anchoring and fish feeding by divers are the main human impacts decreasing the percentage cover of corals at Tobia Kebir but fishing seems to have no role due to its limited level. The lower recorded amount of dead corals at Sharm El Loly though it is highly affected by fishing boats, is due to the fact that...
Tipo: Journal Contribution
Palavras-chave: Chemical and Pollution Studies- Monitoring; Coral reefs; Sedimentation; Distribution; Coral reefs; Distribution; Sedimentation; Http://aims.fao.org/aos/agrovoc/c_1880; Http://aims.fao.org/aos/agrovoc/c_35773; Http://aims.fao.org/aos/agrovoc/c_6926.
Ano: 2006
URL: http://hdl.handle.net/1834/1457

Some textural characteristics and organic matter contents of recent sediments in the Bonny estuary, Niger delta
Provedor de dados: 20
Autores: Dublin-Green, C.O.
Forty-eight bottom sediments samples collected from the Bonny estuary were analyzed for textural Characteristics and organic carbon content.  The dominant lithologies are sand, sandy mud, mud, sandy clay and clay. Pattern of sediment distribution consists of mud, sandy mud and clay in the swallow marginal areas of the river channel and creeks, while the channel centers are predominantly fine to coarse sand with graphic mean size ranging from 0.74 to 2.71Ø. Inclusive standard deviation values ranged from 0.35 to 1.64Ø suggesting the poorly to very well sorted nature of these sediments. Skewness varied from fine skewed to strong coarse skewed with 52% of the samples negatively skewed. Graphic kurtosis ranged from 0.92 to1.95 [mesokurtic to very leptokurtic]....
Tipo: Report
Palavras-chave: Sediment analysis; Sedimentation; Sedimentation; Http://aims.fao.org/aos/agrovoc/c_6926.
Ano: 1985
URL: http://hdl.handle.net/1834/2411

Holocene evolution of relative sea level and local mean high water spring tides in Belgium: a first assessment
Provedor de dados: 27
Autores: Denys, L.; Baeteman, C.
Holocene age-depth data from the Belgian coastal plain, basal peat data particularly, are assessed in terms of local water and tide levels. Basal peat formation was generally induced by sea-level rise; effects of local seepage were limited and significant river-gradient effects were absent. No relation was found between the timing of basal peat inception and substrate permeability. In general, edaphic (moisture) conditions were unfavourable for organic accumulation prior to sea-level related rise of the groundwater table. Error envelopes for the minimum level of local mean high water spring tides and for upper and extreme lower relative mean sea-level limits during the last 9400 solar years (8400 yrs B.P.) are presented. These indicate that the rate of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Holocene; Marine geology; Peat; Sea level changes; Sedimentation.
Ano: 1995
URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=2960

Electron microprobe analysis of suspended matter in the Angola Basin
Provedor de dados: 27
Autores: Bernard, P.; Eisma, D.; Van Grieken, R.
Electron microprobe analysis of suspended-matter samples collected at different water depths at ten stations in the Angola Basin indicated that at each station, from top to bottom, the elementary composition of the suspended matter was very similar and differed from the composition of the suspended matter at the adjacent stations. This indicates that the downward settling of the suspended matter is much faster than the horizontal transport and mixing by the currents. Assuming that the suspended matter settles in the form of flocs, or is scavenged by settling flocs, the suspended matter can indeed reach the bottom in a shorter period than needed for the currents to cover the distance between adjacent stations. Comparison with sediment trap data from the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Biochemical composition; Ocean basins; Sediment traps; Sedimentation; Suspended particulate matter.
Ano: 1999
URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=3977

Improved water and land management in the Ethiopian highlands: its impact on downstream stakeholders dependent on the Blue Nile; Intermediate Results Dissemination Workshop February 5-6, 2009, Addis Ababa, Ethiopia
Provedor de dados: 31
Autores: Awulachew,   Seleshi Bekele; Erkossa,   Teklu; Smakhtin,   Vladimir U.; Fernando,   Ashra.
Tipo: Conference Paper or Presentation
Palavras-chave: River basin management; Watershed management; Farming systems; Water balance; Reservoirs; Water supply; Irrigation requirements; Irrigation programs; Simulation models; Sedimentation; Rainfall-Runoff relationships; Erosion; Soil water; Water balance; Soil conservation; Institutions; Organizations; Policy; Water governance; International waters; Institutional and Behavioral Economics; Land Economics/Use; Resource /Energy Economics and Policy.
Ano: 2009
URL: http://purl.umn.edu/118389

Improved water and land management in the Ethiopian highlands: its impact on downstream stakeholders dependent on the Blue Nile; Intermediate Results Dissemination Workshop February 5-6, 2009, Addis Ababa, Ethiopia
Provedor de dados: 31
Autores: Awulachew,   Seleshi Bekele; Erkossa,   Teklu; Smakhtin,   Vladimir U.; Fernando,   Ashra.
Tipo: Conference Paper or Presentation
Palavras-chave: River basin management; Water governance; Environmental flows; Simulation models; Reservoirs; Sedimentation; Rainfall-Runoff relationships; Hydrology; Water balance; Erosion; Soil conservation; Watersheds; Irrigation schemes; Water use; Environmental Economics and Policy; Land Economics/Use; Resource /Energy Economics and Policy.
Ano: 2009
URL: http://purl.umn.edu/118388

Sediment Morphology, Distribution, and Recent Transport Dynamics in a Reforested Fragment
Provedor de dados: 90
Autores: Bovi,Renata Cristina; Silva,Laura Fernanda Simões da; Zenero,Mariana Delgado Oliveira; Carvalho,Camila Carolina de; Cooper,Miguel.
Abstract Erosion generates large amounts of sediment, which may be deposited at the site of origin, on the slope of a hill, or along waterways. The transportability of each type of sediment by runoff and its potential for subsequent deposition largely depends on its morphological features and particle size distribution. The aim of this study is to describe and characterize the morphology and micromorphology of sediments deposited in a reforested area and to understand the dynamics of the transport process. In order to understand the sedimentation processes, the following analyses were performed: particle size distribution, with and without the use of a dispersant solution; statistical analysis of the sand fraction using Folk and Ward parameters; sediment...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Soil erosion; Sedimentation; Particle size; Silting.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832017000100526

Abundance and diversity patterns of the sessile macrobenthic community associated with environmental gradients in Vitória Harbor, southeastern Brazil
Provedor de dados: 103
Autores: Zalmon,Ilana Rosental; Krohling,Werther; Ferreira,Carlos Eduardo Leite.
Harbor terminals and urban sewage effluents affect the composition and distribution of epibenthic organisms. In this study, we hypothesized that the benthic community structure at the Vitoria Harbor changes spatially in a ~3 km scale, and that these changes are associated with environmental gradients resulting from point-source sewage and differences in the physical and chemical parameters of the water along the harbor access channel. Four sites, internal (PI), intermediate-internal (PMI), intermediate-external (PME) and external (PE), varying from 0.5 to 4.0 km off the harbor, were sampled on five quadrats at six sampling dates (N = 30 per site). The epibenthic community on the shallow sublitoral rocky shore was sampled fortnightly from December 2005 to...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Epibenthic community; Environmental gradient; Estuary; Sedimentation.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-46702011000500012

บทบาทของพืชในพื้นที่ชุ่มน้ำในการบำบัดน้ำเสีย
Provedor de dados: 106
Autores: Pantip Klomjek.
Tipo: Collection
Palavras-chave: Wetland; Constructed wetland; Waste water; Transformation; Filtration; Sedimentation; Environmental; พื้นที่ชุ่มน้ำ; ระบบบึงประดิษฐ์; น้ำเสีย; การตกตะกอน; การกรอง; การปนเปื้อน; สิ่งแวดล้อม; พืช; การบำบัดน้ำเสีย; บทบาทของพืช; การลดความเป็นพิษมลสาร.
Ano: 2009
URL: http://anchan.lib.ku.ac.th/agnet/handle/001/5953

Spatial distribution of palynomorphs in the surface sediments of the Lagoa do Campelo lake, North region of Rio de Janeiro State, Brazil
Provedor de dados: 39
Autores: Luz,Cynthia Fernandes Pinto da; Barth,Ortrud Monika; Silva,Cleverson Guisan.
Four samples of the surface sediments of the Lagoa do Campelo lake bottom were collected in a transect of 500 m by 500 m from edge to edge, in a northeast/southwest direction, the dominant wind direction in the region. The analysis of pollen grains, fern spores and algae were used to evaluate their spatial deposition and level of deterioration. In total, 58 types of pollen grains were identified, mainly from herbs as Cyperaceae, Poaceae and Typhaceae. Pollen grains occurred in all the analyzed sediments. The area of highest concentration was the northeast side of the lake. The southwest side showed the highest pollen grain and fern spore degradation and mechanical damage, probably as they were carried across the lake by wind-driven currents, confirming the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Palynomorphs; Sedimentation; Recent Holocene; Lagoa do Campelo; Rio de Janeiro State.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062005000400009

Sedimentary changes on the Southeastern Brazilian upper slope during the last 35,000 years
Provedor de dados: 42
Autores: Mahiques,Michel M.; Fukumoto,Marina M.; Silveira,Ilson C.A.; Figueira,Rubens C.L.; Bícego,Marcia C.; Lourenço,Rafael A.; Mello-e-Sousa,Silvia H.
A first evaluation of the sedimentary changes, including accumulation of inorganic and organic carbon on the upper slope off Southeastern Brazil under different climatic conditions, based on the analysis of a sedimentary core, is here presented. Results indicate that sedimentation rate as well sedimentary characteristics, including the nature of the organic carbon deposited during the LGM (Last Glacial Maximum), were different from the present deposition, indicating higher primary productivity during the LGM, to be accounted for by the higher values of marine organic carbon. Nevertheless, the higher values of Accumulation Rate of calcium carbonate and organic carbon can be credited to the higher values of the sedimentation rates. Conditions prevailing...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Sedimentation; Accumulation rate; Upper slope; Southeastern Brazil.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652007000100018

Modern sedimentation in the Cabo Frio upwelling system, Southeastern Brazilian shelf
Provedor de dados: 42
Autores: Mahiques,Michel M. de; Bícego,Marcia C.; Silveira,Ilson C.A.; Sousa,Silvia H.M.; Lourenço,Rafael A.; Fukumoto,Marina M.
The analyses of Uk'37 paleotemperatures and sedimentological parameters in box cores from the Cabo Frio upwelling zone, southeastern Brazil, were used to understand the modern sedimentation as well as to evaluate the role played by the upwelling process in the sedimentary patterns. Three box-cores located closer to the upwelling area show a general trend of cooling waters taking place in the last 700 years. Since the present upwelling is dependent on local and remote wind regime, a phase of dominating NE winds favors a more effective upward transport of the cold thermocline level South Atlantic CentralWater towards the coast. The intensification in the upwelling regime for the last ca. 700 years can be associated with the strengthening of the NE winds off...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Sedimentation; Alkenones; Bulk organic matter; Upwelling; Brazil; South Atlantic.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652005000300013

Coastline changes and sedimentation related with the opening of an artificial channel: the Valo Grande Delta, SE Brazil
Provedor de dados: 42
Autores: MAHIQUES,MICHEL M. DE; FIGUEIRA,RUBENS C.L.; ALVES,DANIEL P.V.; ITALIANI,DIANA M.; MARTINS,CRISTINA C.; DIAS,JOÃO M.A.
The role played by human activity in coastline changes indicates a general tendency of retreating coasts, especially deltaic environments, as a result of the recent trend of sea level rise as well as the blockage of the transfer of sediments towards the coast, especially due to the construction of dams. This is particularly important in deltaic environments which have been suffering a dramatic loss of area in the last decades. In contrast, in this paper, we report the origin and evolution of an anthropogenic delta, the Valo Grande delta, on the south-eastern Brazilian coast, whose origin is related to the opening of an artificial channel and the diversion of the main flow of the Ribeira de Iguape River. The methodology included the analysis of coastline...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Anthropic activity; Delta; Sedimentation; Lagoon.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652014000401597

Radiocarbon geochronology of the sediments of the São Paulo Bight (southern Brazilian upper margin)
Provedor de dados: 42
Autores: Mahiques,Michel M.; Sousa,Silvia H.M.; Burone,Leticia; Nagai,Renata H.; Silveira,Ilson C.A.; Figueira,Rubens C.L.; Soutelino,Rafael G.; Ponsoni,Leandro; Klein,Daniel A.
The aim of this work was to generate an inventory of the data on radiocarbon datings obtained from sediments of the São Paulo Bight (southern Brazilian upper margin) and to analyze the data in terms of Late Quaternary sedimentary processes and sedimentation rates. A total of 238 radiocarbon datings from materials collected using differents ampling procedures was considered for this work. The sedimentation rates varied from less than 2 to 68 cm.kyr-1. The highest sedimentation rate values were found in a low-energy (ría type) coastal system as well as in the upwelling zones of Santa Catarina and Cabo Frio. The lowest rates were found on the outer shelf and upper slopes. Our results confirm the strong dependency of the shelf currents, with an emphasis to the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Continental margin; Quaternary; Radiocarbon; Sea-level; Sedimentation.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652011000300006

Tectonic control on the stratigraphic framework of Late Pleistocene and Holocene deposits in Marajó Island, State of Pará, eastern Amazonia
Provedor de dados: 42
Autores: Rossetti,Dilce F.
The traditional view that the Brazilian Amazonia is located in a tectonically stable area since the Cretaceous is changing in front of the increasing documentation of fault reactivations even during the Holocene. How the sedimentary record has responded to these events is an issue that remains to be approached with basis on field data. This work focuses on the stratigraphic correlation of late Quaternary deposits from eastern Marajó Island, with the goal of demonstrating the role of fault reactivation on the origin and preservation of these deposits. Despite the location in a stable platform of a continental passive margin, three studied stratigraphic units display significant vertical offsets that define two depocenters that are better explained through...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Amazonia; Tectonics; Quaternary; Stratigraphic framework; Radiocarbon dating; Sedimentation.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652010000200020

Evaluation of the community structure of marine sponges in reef patches of the southern Caribbean, Costa Rica
Provedor de dados: 50
Autores: Araya-Vargas,Alexander; Busutil,Linnet; García-Rojas,Andrea; Pereira-Chaves,José Miguel; Piedra-Castro,Liliana.
ABSTRACT Marine sponges fulfill many critical functions to coral reefs. In turn, variations in the community structure of the poriferans may indicate changes in the environmental conditions of the ecosystems where they live. However, their study has been scarce in the Caribbean of Costa Rica, mainly in the ecological field. Therefore, the community structure of these organisms was evaluated in four reef patches (Perezoso, Pequeño, Coral Garden, and the 0.36) and it was determined whether it could be explained by sedimentation, substrate, and depth. Relative abundance (RA) and relative coverage (RC) for each species, sponge density, and diversity indices (species richness, Shannon heterogeneity, Pielou's evenness, and Simpson's dominance) were calculated...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Porifera; Coral reef; Sedimentation; Substrate; Depth.
Ano: 2020
URL: http://www.scielo.org.co/scielo.php?script=sci_arttext&pid=S0122-97612020000100039

Recovery of Bacillus sphaericus spores by flocculation/sedimentation and flotation
Provedor de dados: 52
Autores: Luna,Christine Lamenha; Lopes,Carlos Edison; Massarani,Giulio.
The aim of this work was use flocculation/sedimentation and flotation for recovery of spores of the Bacillus sphaericus. Microorganism was produced batchwise using culture medium based skimmed milk, corn steep liquor and mineral salts. The best results of flocculation were obtained using CaCl2.2H2O, FeCl3.6H2O, Al2(SO4)3 and tannin as flocculating agents, with optimal flocculation concentrations of 1,500, 3,000, 2,000 and 1,700ppm, respectively. Flocculent suspensions were characterized based on floc diameter and density. Settling tests were performed in batch at different concentrations of the cellular suspensions and revealed high recovery of the solids in suspension in all cases. Flotation tests were accomplished using a mechanical agitated flotation...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bacillus sphaericus; Flocculation; Sedimentation; Flotation.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132005000400008

Treatment of shrimp effluent by sedimentation and oyster filtration using Crassostrea gigas and C. rhizophorae
Provedor de dados: 52
Autores: Ramos,Roberto; Vinatea,Luis; Seiffert,Walter; Beltrame,Elpídio; Silva,Júlia Santos; Costa,Rejane Helena Ribeiro da.
Efficiency in removing particulate matter from Litopenaeus vannamei shrimp culture effluent was assessed in laboratory scale employing sedimentation and oysters Crassostrea gigas and C. rhizophorae filtration processes. Cylindroconical tanks (100 L) were used in duplicate for sedimentation and 50-L in triplicate for oyster filtration. Fifteen oysters of each species weighing 76-80 g were stocked in each of the filtration treatment experimental units (biomass of 1065 - 1174 g oyster per unit). The control treatment was a tank similar to those used in the filtration treatment but with empty oyster shells. Hydraulic retention time of the effluent was of 6 hours in each treatment. First, effluent went through sedimentation, and then the supernatant went...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Oysters; Filtration; Sedimentation; Effluent; Litopenaeus vannamei.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132009000300030