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| Registros recuperados: 60 | |
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| Lurton, Xavier; Augustin, Jean-marie. |
| The quality estimation associated with individual soundings measured and computed by swath bathymetry sonars is a paramount issue which is most often imperfectly addressed today by sonar manufacturers. In this paper, a unified definition is proposed for a quality factor usable for all swath bathymetry sonars; the depth-relative error is directly estimated from the signal characteristics used in the sounding computation. The basic algorithms are presented for both phase-difference (oblique incidence) and amplitude (normal incidence) detection, and can be readily implemented in any swath bathymetry system using these detection principles. This approach gives a direct access to the objective bathymetric performance of individual soundings, and hence avoids... |
| Tipo: Text |
Palavras-chave: Bathymetry; Interferometry; Multibeam echosounder (MBES); Sonar. |
| Ano: 2010 |
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| Gutscher, Marc-andre; Kopp, Heidrun; Krastel, Sebastian; Bohrmann, Gerhard; Garlan, Thierry; Zaragosi, Sebastien; Klaucke, Ingo; Wintersteller, Paul; Loubrieu, Benoit; Le Faou, Yann; San Pedro, Laurine; Dominguez, Stephane; Rovere, Marzia; De Lepinay, Bernard Mercier; Ranero, Cesar; Sallares, Valenti. |
| The detailed morphology and internal structure of the Calabrian accretionary wedge and adjacent Eastern Sicily margin are imaged in unprecedented detail by a combined dataset of multi-beam bathymetry and high-resolution seismic profiles. The bathymetric data represent the results of 6 recent marine geophysical surveys since 2010 as well as a compilation of earlier surveys presented as a 2 arc-sec (60 m) grid. Several distinct morpho-tectonic provinces are identified including: the deeply incised Malta–Hyblean Escarpment, numerous submarine canyons, broad regions of relatively flat seafloor dominated by fields of sediment waves, the gently undulating anticlinal fold-and-thrust belts of the external Calabrian accretionary wedge and the adjacent portion of... |
| Tipo: Text |
Palavras-chave: Subduction; Active faults; Eurasia-Africa plate boundary; Bathymetry; Seismic profiles; Accretionary wedge. |
| Ano: 2017 |
URL: https://archimer.ifremer.fr/doc/00366/47685/47853.pdf |
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| Durand, H.; Guillaumont, Brigitte; Loarer, Ronan; Loubersac, Lionel; Heral, Maurice; Prou, Jean. |
| The Charente Maritime coast, in central western France, is the most important area for oyster and mussel production in Europe. High density, in this restricted intertidal area, induces low growing rate and socio-economic difficulties. One of the possible solutions is to shift some oysters from intertidal area to submerged areas. Bathymetry, sedimentology, hydrodynamism, fisheries and administrative rules are some conditions which are considered to establish the better selection of potential zone. The successive steps of setting up the prototype of GIS are presented: digitized traditional data from charts, extracted data from grid models (hydrodynmaic model), merging of thematic covers, proposal of favorable areas. The results are discussed especially on... |
| Tipo: Text |
Palavras-chave: GIS; Modelisation; Bathymetry; Sedimentology; Hydrodynamism; Marennes Oleron. |
| Ano: 1994 |
URL: http://archimer.ifremer.fr/doc/00017/12784/9725.pdf |
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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-Geziry, T.M.; Abd Ellah, R.G.; Maiyza, I.A.. |
| Alexandria Eastern Harbor is a shallow, protected, semi-enclosed, circular basin. It is connected to the Mediterranean Sea through two openings: El-Boughaz (main) and El-Silsila. New data, from a recent bathymetric survey in the Harbor, is used to build up its bathymetric chart. The bottom of the Harbor slopes gradually seawards, with an average depth of 5m inside the Harbor. The study build up Alexandria Eastern Harbor new bathymetric chart, will be a useful tool to follow-up the problems of the harbor and to propose suitable solutions. Recommendations are set in the end of the study to activate the self recovery (by the Harbor water body) to preserve and recover the situation of Alexandria Eastern Harbor. |
| Tipo: Journal Contribution |
Palavras-chave: Environmental Field Study; Bathymetry; Bathymetric charts. |
| Ano: 2007 |
URL: http://hdl.handle.net/1834/1897 |
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| Minghelli Roman, Audrey; Polidori, Laurent; Mathieu-blanc, Sandrine; Loubersac, Lionel; Cauneau, François. |
| Bathymetric estimation using remote sensing images has previously been applied to high spatial resolution imagery such as CASI, Ikonos, or SPOT but not on medium spatial resolution images (i.e., MERIS). This choice can be justified when there is a need to map the bathymetry on large areas. In this letter, we present the results of the bathymetry estimation over a large known area, the Gulf of Lion (France), expanding over 270 x 180 km. |
| Tipo: Text |
Palavras-chave: MERIS; Coastal zone; Bathymetry. |
| Ano: 2007 |
URL: http://archimer.ifremer.fr/doc/2007/publication-2597.pdf |
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| Petit, Tillys. |
| The Reykjanes Ridge is a major topographic feature of the North-Atlantic Ocean that extends from Iceland to the Charlie Gibbs Fracture Zone. Located between the Iceland Basin and the Irminger Sea, the Reykjanes Ridge strongly influences the subpolar gyre circulation and is a gate toward the deep convection areas. However, the circulation and distribution across the Reykjanes Ridge has never been directly quantified such that the characterization of the connection between the Iceland Basin and the Irminger Sea is still incomplete. As part of the Reykjanes Ridge Experiment project, we were able to analyze the circulation around, above and across the Reykjanes Ridge. Mainly based on hydrographic sections along and perpendicular to the ridge axis, the aim of... |
| Tipo: Text |
Palavras-chave: Gyre subpolaire Nord-Atlantique; Bathymétrie; Masses d’eau; North-Atlantic; Subpolar gyre; Bathymetry; Water masses; Circulation; Observations. |
| Ano: 2018 |
URL: https://archimer.ifremer.fr/doc/00498/60969/64377.pdf |
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| Montero Aguirre, Saúl. |
| Los cuerpos de agua son importantes para el almacenamiento y abastecimiento de agua potable, riego, generar energía eléctrica, además de ser importantes para disipar la fuerza de las grandes avenidas, estos cuerpos pueden ser utilizados como criaderos de peces y áreas de recreación, de lo cual muchas comunidades obtienen recursos adicionales para sobrevivir. A los ríos descargan las aguas negras de las comunidades que a su paso se encuentran, llevando grandes cantidades de sedimentos y de contaminantes. Las aguas del Río Tulancingo llegan a la Laguna de Metztitlan, la cual en tiempo de lluvias tiende a provocar inundaciones aguas arriba. Este cuerpo de agua al igual que la mayoría de los cuerpos de agua que existen en México, está perdiendo su... |
| Tipo: Tesis |
Palavras-chave: Batimetría; Sedimentos; Cuerpos de agua; Cuenca; Morfología; Maestría; Hidrociencias; Bathymetry; Silts; Bodies of water; Basin; Morphology. |
| Ano: 2008 |
URL: http://hdl.handle.net/10521/1254 |
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| Renard, V. |
| The side looking sonars have been developed for greater swath coverage, digital processing of the signals has improved the quality of the images and interferometric techniques have been used to determine the depth of the bottom features. A review of the systems existing today is presented. Documents such as graphs, block diagrams, images, maps, sections, created from data acquired at sea level suffer from a filtering or smoothing effect that restricts the representativity of the measured parameters and therefore limits their interpretation. The greater the depth of the seafloor, the greater the filtering. It is due not only to the nature of the measured phenomenon but also the characteristics of the sensors, to their operation and to the data processing.... |
| Tipo: Text |
Palavras-chave: Bathymetry; Cartography; Sensors; Echosounders; Acoustic imagery; Acoustics; Ocean floor; Seafloor mapping. |
| Ano: 1990 |
URL: http://archimer.ifremer.fr/doc/1990/acte-1147.pdf |
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| Koffi, Koffi Ph.; Affian, Kouadio; Abé, Jacques. |
| Les cartes bathymétriques, et les profils de plage du périmètre littoral de Port-Bouet constituent les documents de base de cette étude. Une analyse cartographique appropriée (cartes bathymétriques et cartes des pentes)a permis de définir des types de plage (s.l.) susceptibles de donner des indications sur la relation morphologie-sédimentologie. Ces analyses mettent en évidence les trois grandes sous unités morphologiques du littoral de Vridi-Port-Bouet: le domaine à l'ouest du canal de vridi en engraissement,au profil bathymétrique convexe, le domaine de la baie de Port-Bouet en érosion et le domaine à l'est de la baie de Port-Bouet en érosion ou en équilibre dynamique. |
| Tipo: Journal Contribution |
Palavras-chave: Shelf sedimentation; Coastal landforms; Bathymetry. |
| Ano: 1993 |
URL: http://hdl.handle.net/1834/5471 |
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| De Casamajor, Marie-noelle; Derrien-courtel, Sandrine; Lalanne, Yann; Maria Gorostiaga, José; Le Gal, Aodren; Huguenin, Laura; Quintano, Endika; Lissardy, Muriel. |
| Cystoseira baccata, a biological quality element for the implementation of the Water Framework and Marine Strategy EU Directives, is a dominant species in the subtidal rocky bottoms of the Basque coast. As part of this issue and given the need to better understand the functional character of benthic rocky ecosystems and use them as a reference to anthropogenic changes, two samplings campaigns were conducted in 2014 and 2017. Several population parameters (i.e. frond density, frond length frond-length/total frond-length ratio and taxonomic richness of epibionts) of C. baccata were studied from three sites monitored within the Water Directive Framework in relation to bathymetry during the two campaigns. The results showed a significant influence of... |
| Tipo: Text |
Palavras-chave: Bathymetry; Cystoseira baccata; Epiphytes; Foundation species; Population parameters; Water framework directive. |
| Ano: 2019 |
URL: https://archimer.ifremer.fr/doc/00500/61151/64581.pdf |
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| Le Moine, Olivier; Geairon, Philippe; Goraguer, Herle; Poitevin, Pierre; Robert, Stephane; Goulletquer, Philippe. |
| In 2013, the project ‘Assessment of the renewable rate of the seawater masses in the Miquelon ‘Grand Etang’ ‘ focused essentially on (1) building a data set originating from all partners (e.g., DTAM, IGN), (2) preliminary sampling of current patterns so as to facilitate the 2014 field sampling strategy. Besides this approach, a census of aerial pictures dated from 1950, 1990 and 2005 were studied to assess the temporal trends of this geographic sector. The field work to be carried out in 2014 are: 1) Bathymetry: data acquisition in the ‘Grand Etang’ in the area presently used for mussel long lines culture to obtain a comprehensive data set, transversal profiles at the strait level at the near vicinity of the current pattern measuring station. 2) Current... |
| Tipo: Text |
Palavras-chave: Courantométrie; Bathymétrie; Saint Pierre & Miquelon; Current meters; Bathymetry; Saint Pierre & Miquelon. |
| Ano: 2014 |
URL: http://archimer.ifremer.fr/doc/00175/28581/26975.pdf |
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| Registros recuperados: 60 | |
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