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| Registros recuperados: 19 | |
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| Vanhove, S.; Beghyn, M.; Van Gansbeke, D.; Bullough, L.W.; Vincx, M.. |
| Under the typical high-latitude conditions of temperature, productivity and settlement of chlorophyll and phaeophytin to the sediment, many benthic organisms in the Antarctic show strong seasonal variation. Although meiofauna comprise an important component of the southpolar benthic ecosystem, our knowledge of them is limited. The metazoan meiofauna and the surrounding sediments were studied fortnightly for 18 mo in a shallow bay at Signy Island (Factory Cove, South Orkneys, Antarctica) to test whether and how the temporal variability of the environment influenced meiobenthos dynamics. By examination of the distribution of the abundance and biomass of the total community, the density of higher taxonomic groups, and of individual dominant nematode genera... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Benthos; Biomass; Population density; Seasonal variations; Sediment analysis; Trophic relationships; Copepoda [copepods]; Nematoda [Nematodes]; Ostracoda. |
| Ano: 2000 |
URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=6138 |
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| Augris, Claude; Hamon, Dominique. |
| This atlas presents in a synthetic form the hydrodynamical, geological and biological characteristics of one of the most studied region of the French littoral. Geologic and geophysical data of the Saint-Brieuc Bay show that the deep basement consists of pre-palaeozoic or palaeozoic sedimentary series in the centre of the Bay, whereas metamorphic and magmatic formations are dominant in coastal regions. The location of superficial sediments in the Bay, is mainly due to marine currents. A granulometric gradient, from very fine to coarse sediments, appears in two directions: from the coast towards the high sea, and from the west to the east. Rocky substrates disrupt the sediment distribution, with, most of the time, a concentration of coarse sediments near the... |
| Tipo: Text |
Palavras-chave: Atlas; Bathymetry; Bottom topography; Commercial species; Geomorphology; Hydrodynamics; Marine resources; Sediment analysis; Sedimentary basins; Zoobenthos. |
| Ano: 1996 |
URL: http://archimer.ifremer.fr/doc/00031/14246/11527.pdf |
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| El-Moselhy, K.M.. |
| The present study aims to measure the concentration of vanadium in 73 sediment samples collected along the coastal area of the Egyptian seas (Mediterranean and Red Seas). The results indicated that the mean value of vanadium in Red Sea sediments (52.61 µg/g) was higher than the mean value of the Mediterranean (40.58 µg/g) and the variation between the two means was insignificant (p = 0.241). This result could be attributed to the high petroleum activities of the Red Sea. Along the Mediterranean coast, the sector in front of Port Said area exhibited the highest mean value of vanadium (103.9 µg/g) than other sectors, which suffers from many sources of pollution. While the highest mean value along the Red Sea coast (73.20 µg/g) was found at the sector of Red... |
| Tipo: Journal Contribution |
Palavras-chave: Chemistry analysis of sediments; Sediment analysis; Vanadium; Marine sedimentation; Heavy metals; Vanadium. |
| Ano: 2006 |
URL: http://hdl.handle.net/1834/1447 |
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| Brahim., M.; Abdelfattah., A.. |
| Les analyses granulométriques des sédiments superficiels de la zone côtière située entre Ras Taguermess et Ras Marmours montrent que les petits fonds (-2 à -10 m) sont couverts par des sables fins aux sables grossiers (la moyenne est entre 0,39 et 3,34 ), généralement mal à très mal classés. Cependant, le haut de plage situé entre Ras Taguermess et Ras Marmour est couvert essentiellement par des sables fins et des sables moyens (la moyenne est entre 1,082 et 2,823 ). La répartition spatiale des sables ne montre pas un grano-classement décroissant ou croissant des sédiments de la côte vers le large. Cette distribution est due à l‘existence d’une énergie importante où la houle joue le rôle essentiel sur leur répartition. L’étude granulométrique montre aussi... |
| Tipo: Journal Contribution |
Palavras-chave: Beaches; Coastal zone; Grading; Grain size; Longshore sediment transport; Sand; Sediment analysis; Sediment texture; Sediments; Swell. |
| Ano: 2009 |
URL: http://hdl.handle.net/1834/4456 |
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| Brahim., M.; Atoui, A.. |
| Les analyses granulométriques des sédiments superficiels de la zone côtière située entre Ras Taguermess et Ras Marmours montrent que les petits fonds (-2 à -10 m) sont couverts par des sables fins aux sables grossiers (la moyenne est entre 0,39 et 3,34 ), généralement mal à très mal classés. Cependant, le haut de plage situé entre Ras Taguermess et Ras Marmour est couvert essentiellement par des sables fins et des sables moyens (la moyenne est entre 1,082 et 2,823 ). La répartition spatiale des sables ne montre pas un grano-classement décroissant ou croissant des sédiments de la côte vers le large. Cette distribution est due à l‘existence d’une énergie importante où la houle joue le rôle essentiel sur leur répartition. L’étude granulométrique montre aussi... |
| Tipo: Journal Contribution |
Palavras-chave: Beaches; Coastal zone; Grading; Longshore sediment transport; Sediment analysis; Sediment texture; Sediments; Swell. |
| Ano: 2009 |
URL: http://hdl.handle.net/1834/4445 |
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| Brahim, M.; Ben Amor, R.; Gueddari, M.. |
| The results of the grain size and mineralogical analysis of the surface sediments of the Gulf of Gabes, taken with Various depths between the coast Sfax-Zarzis and the isobaths -100 m, allow to identify the origin of these sediments and to specify the factors and the phenomena, which are involved in their transport and their deposit. The mineralogical study resulted in high lighting a clear relation between the recent sedimentary stock of the gulf of Gabès and the bordering geological formations. The sediments study showed that the detritus materials are of continental origin and the sediments coming from the coastal erosion are subjected to a dynamics, which is controlled, primarily by the action of the currents (current coastal and currents tide and by... |
| Tipo: Journal Contribution |
Palavras-chave: Grain size; Sediment analysis; Sediment chemistry; Sediments; Mineralogy. |
| Ano: 2003 |
URL: http://hdl.handle.net/1834/1118 |
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| Soledispa, B.. |
| Se estudian 146 muestras de sedimentos superficiales de fondo del Golfo de Guayaquil. Se presenta las características de los sedimentos en base al análisis granulométrico, parámetros estadísticos y distribución de los sedimentos; y se comparan estas distribuciones con otras de trabajos anteriores. Se establece que los sedimentos arenosos y sus diferentes combinaciones predominan en el área, ocupando casi un 80% de la misma. Los sedimentos limosos se ubican en el Noroeste, mientras que en el Oeste sólo encontramos una pequeña cantidad de fragmentos de conchas. El análisis comparartivo con investigaciones realizadas en 1975, no presenta variaciones significativas en la textura y distribución de los sedimentos. |
| Tipo: Journal Contribution |
Palavras-chave: Sediments; Nearshore sedimentation; Sediment analysis; Sediment composition; Sediment distribution. |
| Ano: 1987 |
URL: http://hdl.handle.net/1834/2145 |
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| Ben Gharali, A.; Ouakad, M.; Gueddari, M.. |
| L'oued Tinja relie la garaet Ichkeul à la lagune de Bizerte laquelle communique avec la mer Méditerranée par un long goulet. Les eaux de cet oued dépendent à la fois des apports saisonniers des eaux marine et douce et présente de ce fait, des salinités très fluctuantes. L'important réseau hydrographique associé au plan d'eau de l'Ichkeul (avec un bassin versant très important d'environ 2080 km2) est sujet à de nombreux aménagements hydrauliques, notamment la construction de barrages de retenues d'eau douce. Ces derniers sont susceptibles de perturber les caractéristiques hydrologiques, sédimentologiques et géochimiques du système laguno-lacustre (lagune de Bizerte et garaet Ichkeul) et d'entamer par voie de conséquence sa diversité et sa richesse... |
| Tipo: Journal Contribution |
Palavras-chave: Environmental impact; Geochemistry; Hydrology; Quality; Sediment analysis; Species diversity. |
| Ano: 2008 |
URL: http://hdl.handle.net/1834/4270 |
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| Chkioua, A.; BRAHIM, M.. |
| Les résultats des analyses granulométriques et minéralogiques des sédiments de surface du golfe de Tunis, prélevés à différentes profondeurs entre Sidi El Mekki et le Cap Bon, ont permis d’identifier l’origine de ces sédiments et de préciser les modes de transport et de dépôt. L’étude granulométrique a montré que les matériaux détritiques dans le golfe de Tunis sont d’origine continentale. L’étude minéralogique a permit de mettre en évidence une nette relation entre le stock sédimentaire récent du golfe de Tunis et les formations géologiques bordières. La répartition des sédiments grossiers et fins dans le golfe de Tunis est contrôlée par les courants généraux de la méditerranée. Le passage des courants généraux dans le golfe conditionne la présence... |
| Tipo: Journal Contribution |
Palavras-chave: Dynamics; Grain size; Granulometry; Mineralogy; Sediment analysis; Sediment distribution. |
| Ano: 2007 |
URL: http://hdl.handle.net/1834/4254 |
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| Lakshmanaperumalsamy, P; Chandramohan, D; Natarajan, R. |
| A seasonal study on the occurrence and distribution of total aerobic microbial population (TMP), total aerobic heterotrophic bacteria (THB), actinomycetes and fungi in the sediments of Vellar Estuary, South India (11 degree 29'N 79 degree 46'E) was carried out during Jan. to Dec. 1975. Sediment samples were collected at monthly intervals, from 4 stations and analysed microbiologically. In general, bacterial population was found to be dominant followed by actinomycetes and fungi. The max peak for TMP, THB and fungi were recorded in Nov. in all stations. Monsoon season supported TMP, THB and fungi to a high level and it was summer for actinomycetes. Statistical analysis (Kendall's tau) showed a significantly positive correlation among TMP, THB, actinomycetes... |
| Tipo: Text |
Palavras-chave: Actinomycetes; Population number; Statistical analysis; Seasonal variations; Fungi; Bacteria; Sediment analysis; Microbiological analysis. |
| Ano: 1984 |
URL: http://archimer.ifremer.fr/doc/1984/acte-943.pdf |
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| 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 |
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| Registros recuperados: 19 | |
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