Tesis sobre el tema "Marine to continental transition"
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Alves, Luizemara Soares. "Estudo da margem continental ibérica ocidental com base em dados gravimétricos e magnetométricos regionais". Universidade do Estado do Rio de Janeiro, 2012. http://www.bdtd.uerj.br/tde_busca/arquivo.php?codArquivo=6240.
Texto completoPotential field methods are known as a very useful tool to regional studies. On Western Iberia, gravimetric and magnetometric data could be helpful to understand some questions about the offshore tectonic framework. In this area, both continental break-up features and inherited continental basement structures have a strong contribution to compose the regional geophysical response on gravimetric and magnetometric maps. This work aims to correlate observed geophysical features of the Iberian margin with some geological models about the tectonic framework of Western Iberia, already published on literature. Filtered maps were used to recognize different geophysical signatures, which were computed from both calculated Bouguer gravity and total magnetic field, such as total horizontal gradient, tilt derivative, vertical derivative, and vertical integration. The continental crustal domain was defined from gravity data interpretation using an enhanced total horizontal gradient of Bouguer Anomaly maps. Magnetic data was used to identify three more regional offshore domains that could indicate three types of non-sialic crust. Two of them are proposed as transitional domains. The landward transitional crust has a very weak regional magnetic response, and the seaward one is a high amplitude anomaly domain, similar to oceanic magnetic response. The oceanic crustal boundary was not confirmed, but a third offshore domain, seaward from C34 isochron, could be considered as oceanic crust by its magnetic pattern. Some basement lineaments were indicated in the offshore continental crust. Gravimetric and magnetic features coincide in terms of their direction and position with Variscan suture zones mapped onshore. Therefore these contacts could correspond the offshore continuation of these Paleozoic features, such as the Ossa-Morena Zone and Centro-Ibérica Zone suture zone. In this interpretation, offshore continental crust could be formed by units from Southwest Iberia. It allows considering the Porto-Tomar fault as a part of a swath of strike-slip deformation, where mesozoic basins are located.
Bouton, Anthony. "Facteurs de contrôle extrinsèques des dépôts microbiens récents en domaine de transition continental-marin". Thesis, Dijon, 2016. http://www.theses.fr/2016DIJOS012/document.
Texto completoLithified microbial deposits, considered as microbialites, are organosedimentary structures observed since 3.5 billion years. Understanding the mechanisms and environmental conditions leading to their formation may provide valuable information about the origin of life on Earth. Our interest on this research topic has increased owing to the economic implications of these deposits, especially concerning the hydrocarbons. The reconstruction of the environments associated with microbial structures remains uncertain in the fossil record, especially between marine and continental domains. These two contrasting environments were studied through two modern examples: (1) a marine-fed lagoon area in Cayo Coco (Cuba), and the continental lake of the Great Salt Lake (Utah, USA) in order to identify diagnostic criteria allowing to distinguish both environments in the fossil record.Microbialite result from mineralization and lithification of microbial mats under the influence of metabolic chemical reactions (intrinsic) related to the activity of the microbial biomass and environmental (extrinsic) conditions. The objective of this PhD is to replace microbial deposits, at different scales, in their context of formation to highlight the significance of extrinsic parameters on: (1) the mineralization processes and the formation of microbialites, (2) the morphologies of observed microbial structures, (3) their spatial distribution, and (4) the relationship between microbial mats and microbialite and their environment
Nunez, del Prado Hernando. "Systèmes de dépôts et évolution sédimentaire des séries de transition marin-continental dans le synclinorium de Guarga (bassin sud-pyrénéen) : (Province de Huesca N-Espagne)". Pau, 1986. http://www.theses.fr/1986PAUU300X.
Texto completoMAGALHÃES, José Ricardo Gonçalves. "Compartimentação tectono-sedimentar da Bacia da Paraíba, a partir da integração de métodos potenciais e interpretação sísmica de dados OFFSHORE". Universidade Federal de Pernambuco, 2015. https://repositorio.ufpe.br/handle/123456789/17212.
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PRH-26/ ANP
Vários trabalhos têm tentado abordar a evolução das margens conjugadas do Atlântico, incluindo o nordeste do Brasil e o oeste da África. Entretanto, o avanço de pesquisas anteriores tem sido dificultado em razão da falta de dados na região marginal da porção oriental do nordeste do Brasil, principalmente na área inserida entre a Zona de Cisalhamento de Pernambuco e o Alto de Touros. Este fato tem imposto limitações ao desenvolvimento de modelos regionais sobre a evolução geotectônica e paleogeográfica desta região, assim como na correlação com sua contraparte na África. Nesta dissertação é apresentada uma investigação realizada com base em dados gravimétricos, magnéticos e sísmicos regionais. Os resultados mostraram que esta região representa um alto do embasamento com a orientação regional das principais estruturas tectônicas (ENE-WSW), ortogonais as estruturas desenvolvidas durante o processo de abertura das bacias da Paraíba e da Plataforma de Natal (NNE-SSW e NNW-SSE). Sobre o embasamento continental formou-se uma plataforma estreita com uma cobertura sedimentar pouco espessa (0,8-2,5 km) e uma quebra abrupta da plataforma, criando uma vasta zona de bypass através do talude. A análise de uma seção sísmica profunda revelou que a crosta continental afinada (crosta transicional) representa uma estreita zona e que o limite crosta continental-oceânica (COB) está localizado a aproximadamente 100 km a leste da atual linha de costa, na Bacia da Paraíba, e a 70 km, na Bacia da Plataforma de Natal. A modelagem geofísica, integrada com a interpretação sísmica, indica que esta região é caracterizada por um afinamento abrupto da crosta continental, com a consequente ascensão súbita da Moho. Também há evidências da existência de uma zona de crosta continental extremamente afinada, a qual foi interpretada como crosta proto-oceânica. Estes novos dados demonstram que esta área apresenta fortes similaridades com margens rifteadas não vulcânicas ou pobres em magma.
Several studies have tried to address the evolution of the Atlantic conjugate margins, including Northeast Brazil and West Africa. However, past research advances has been hindered by a lack of data for the marginal region in the eastern portion of northeastern Brazil, extending from the Pernambuco Shear Zone to the Touros High. This situation has imposed serious limitations on the development of a regional view of the geotectonic and paleogeographic evolution of this area and on correlations with regional counterparts in Africa. Here, we present an investigation using regional gravimetric, magnetic and seismic data. The results show that this region represents a basement high with regional orientation of tectonic structures (ENE-WSW) orthogonal at structures developed during the open processes of the Paraíba and Natal Platform Basins (NNE-SSW and NNW-SSE). The continental basement forming a narrow platform with a thin sedimentary cover (0.8-2.5 km) and an abrupt shelf break, which created a large bypass zone towards the slope. The analysis of a deep seismic section revealed that thinned continental crust (transitional crust) occupies a narrow zone and that the continental-oceanic boundary (COB) is located approximately 100 km to the east of the present coastline, at Paraíba Basin, and 70 km, at Natal Platform Basin. Geophysical modeling integrated with interpretation of the seismic data suggests that this region is characterized by an abrupt thinning of continental crust, with an accompanying sudden rise of the Moho. There are also indications for the existence of a zone of extremely thinned continental crust, which was interpreted as protooceanic crust. Our findings suggest that the study area shows strong similarities to nonvolcanic or magma-poor rifted margins.
Brionne, Charles. "Signatures morphosédimentaires de la dynamique juxta-glaciaire à la transition de fronts glaciaires marins à terrestres : le cas de la Côte-Nord du Québec (estuaire et golfe du St Laurent)". Electronic Thesis or Diss., Strasbourg, 2024. http://www.theses.fr/2024STRAH005.
Texto completoThis thesis combines a dual geomorphological and sedimentological approach with the use of LiDAR data, bathymetry, drone photogrammetry and radiocarbon dating. It has enabled us to reconstruct the glacial paleodynamics in a deglaciation context for the Laurentide ice sheet since the last glacial maximum, around 20,000 years ago, and more specifically during the transition from an ice margin anchored at sea to a continental ice margin: (1) mapping, synthesising and proposing a model for the megagrooves of the North Shore of the St Lawrence, a first study for these morphologies, and (2) reconstructing the geomorphological and morphosedimentary record of the Pentecôte sedimentary complex, which precisely represents this transition. Overall, this thesis demonstrates the importance of the structural heritage and physiography of the floor at the glacial margin in the reconstruction of the glacial retreat dynamics of the eastern LIS margin
Hamai, Lamine. "Étude thermomécanique de la zone de transition mer-continent de la marge algérienne : implication géodynamique". Thesis, Nice, 2016. http://www.theses.fr/2016NICE4021/document.
Texto completoUnderstanding how subduction initiates at a passive margin is a major geodynamic question, which remains debatted because of the forces necessary to overcome bending and frictional resistance of the lithosphere and initiate this subduction. Along the southern shore of the Western Mediterranean Sea, the Algerian margin undergoes ~NS compression due to the African-Eurasian convergence at a rate of less than ~ 1 cm / year. This setting causes tectonic inversion of this North African passive margin and possibly incipient subduction. Indeed, recent geophysical marine data acquired in the Algerian Basin (MARADJA, 2003, 2005MARge Active d’el Djazaïr) and SPIRAL 2009 (Deep Seismic and Regional Investigations in Algeria campaigns) showed evidence of recent compressive deformation. We used SPIRAL wide-angle seismic profiles to determine the state of isostatic equilibrium at the vicinity of the continent-ocean boundary. This allowed us to image a too deep Moho in the oceanic part, and a too shallow one in the continental domain, with a boundary between both domains located at the margin toe. These results indicate that the Algerian margin display the same isostatic anomalies as an active margin. This isostatic disiquilibrium may be simulated by the flexural bending of two lithospheric plates that can be modelled by a finite element procedure. This modeling shows larger vertical deflection in the central part of the study area (6-7 km) compared to the earsternmost and westernmost profiles (3 km)
Walsh, John Patrick. "Continental-margin sedimentation : a wet-tropical perspective from New Guinea /". Thesis, Connect to this title online; UW restricted, 2001. http://hdl.handle.net/1773/11017.
Texto completoPrescott, Clifford Neill. "Marine geophysical investigation of the Hatton Bank volcanic passive continental margin". Thesis, Durham University, 1988. http://etheses.dur.ac.uk/6660/.
Texto completoHemer, Mark A. "The oceanographic influence of sedimentation on the continental shelf : a numerical comparison between tropical and Antarctic environments /". Connect to this title online, 2003. http://adt.lib.utas.edu.au/public/adt-TU20051223.102442.
Texto completoClose, David Ian. "A marine geophysical study of the Wilkes Land rifted continental margin, Antarctica". Thesis, University of Oxford, 2005. http://ora.ox.ac.uk/objects/uuid:bfc7eee9-de28-4934-8f79-82b300a5f706.
Texto completoRodger, Matthew. "A marine geophysical study of the Amazon continental margin, North-Eastern Brazil". Thesis, University of Oxford, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.504519.
Texto completoSchrodt, Franziska Irmela. "Multi-continental biogeochemical comparisons of tropical forest-savanna zones of transition". Thesis, University of Leeds, 2011. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.545713.
Texto completoNowicki, Sophie Marie Jeanne. "Modelling the transition zone of marine ice sheets". Thesis, University College London (University of London), 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.499076.
Texto completoWren, Patricia Ansley. "Sediment transport measurements on the mid-continental shelf in Onslow Bay, NC". NCSU, 2004. http://www.lib.ncsu.edu/theses/available/etd-03152004-100655/.
Texto completoNuwer, Jonathan Mark. "Organic matter preservation along a dynamic continental margin : form and fates of sedimentary organic matter /". Thesis, Connect to this title online; UW restricted, 2008. http://hdl.handle.net/1773/10999.
Texto completoRégnier, Damien. "Modélisation physique et numérique de la dynamique d’un pergélisol au cours d’un cycle climatique : implications pour le site de Meuse - Haute-Marne". Rennes 1, 2012. http://www.theses.fr/2012REN1S054.
Texto completoThis manuscript deals about works realized on the permafrost modelling in porous media and its impact on the hydrogeological circulations. These are parts of the Andra’s studies on the nuclear waste storage and, on the environmental studies of the Meuse/Haute-Marne (MHM) site. During a climatic cycle, cold periods can generate permafrost (ground with temperature lower than 0°C for 2 consecutive years). This periglacial structure propagates towards deep geological layers, and, due to its very low permeability, can stop the flow of water bodies like aquifers. This work presents the elaboration of two numerical models (with Cast3M code (CEA)): (i) a model with thermal conduction, used for the study of a cold wave propagation in porous media with phase transition (water-ice); (ii) a more complex model, managing the thermo-hydraulic coupling of ground phenomenon (conduction, convection and transition of phase). After validation, these two models offer three axes of development: (i) benchmark proposition by the study of two generic test-cases; (ii) study of the local air temperature signal on MHM site : importance of high frequency temperature variations (centennial scale) for permafrost depth and stability ; (iii) study of the dynamics of a thermal discontinuity in a typical hydrological system river-plain: closure time of the system by the permafrost according to various parameters (temperatures, geothermal flow, hydrological flow directions). These points are directly linked with the problems of the MHM site
Couzens, Timothy John. "The rift to drift transition and sequence stratigraphy at passive continental margins". Thesis, University of Liverpool, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.333509.
Texto completoJuby, Paul Robert. "Hydrographic conditions of a continental shelf region in the Northwest African Upwelling System from in-situ data". Master's thesis, University of Cape Town, 2015. http://hdl.handle.net/11427/19971.
Texto completoMcNeill, Gavin William. "The geochemical palaeo-oceanography and mineralogy of marine sediments from the Peruvian Continental Margin". Thesis, University of Edinburgh, 1993. http://hdl.handle.net/1842/15360.
Texto completoColvocoresses, James Alden. "Abundance, seasonality and community structure of fishes on the Mid-Atlantic Bight continental shelf". W&M ScholarWorks, 1985. https://scholarworks.wm.edu/etd/1539616615.
Texto completoHartnett, Hilairy Ellen. "Organic carbon input, degradation, and preservation in continental margin sediments : an assessment of the role of a strong oxygen deficient zone /". Thesis, Connect to this title online; UW restricted, 1998. http://hdl.handle.net/1773/10961.
Texto completoGugliotta, Marcello. "The fluvial to marine transition zone and its stratigraphic significance". Thesis, University of Manchester, 2016. https://www.research.manchester.ac.uk/portal/en/theses/the-fluvial-to-marine-transition-zone-and-its-stratigraphic-significance(c9a2baf3-7ba0-46fb-a589-77d4f0f48578).html.
Texto completoCordero, Luisa Mariutti. "Estudo dos processos sedimentológicos na Margem Continental Sudeste do Brasil pelo uso de radionuclídeos naturais". Universidade de São Paulo, 2010. http://www.teses.usp.br/teses/disponiveis/21/21133/tde-03082011-154909/.
Texto completoRecently, Oceanography has been using a variety of radionuclides as tracers to understand ocean dynamic processes, handling and disposal of sediments in seabed. In Brazil, there is little information about the contents of natural radionuclides on the coast and deep ocean and few studies using radionuclides as tools to comprehend oceanic processes. In this context, this work determined grain size and activities of 238U, 232Th and 40K using gamma spectrometry in marine sediments from shelf and upper slope off Southeast Brazil. The levels ranged from 1,48 to 52,76 Bq kg-1 for 238U, from 10,63 to 49,45 Bq kg-1 for 232Th and, from 65,45 to 873,28 Bq kg-1 for 40K. 40K and 232Th showed good correlation with grain size (mud and clay content) and 238U/232Th ratios appeared to be good indicators of sediment redox conditions. There was a difference in levels of radionuclides between sectors northward and southward of São Sebastião Island, with higher values in south sector. These differences were related to differences in sedimentary processes in each sector and to the hydrodynamic agents responsible for these processes.
Gontikaki, Evangelia. "Carbon cycling in continental slope sediments : the role of benthic communities". Thesis, University of Aberdeen, 2010. http://digitool.abdn.ac.uk:80/webclient/DeliveryManager?pid=128351.
Texto completoHoughton, S. D. "Coccolith assemblages in recent marine and estuarine sediments from the continental shelf of northwest Europe". Thesis, University of Southampton, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.375743.
Texto completoMotz, Gary J. "Mollusc Diversity in the Marine and Continental Realms: A Case Study of the Estuary Effect". University of Akron / OhioLINK, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=akron1275740740.
Texto completoPALIAGA, ENRICO MARIA. "Upper slope geomorphology of Sardinian southern continental margin, applications to habitat mapping supporting marine strategy". Doctoral thesis, Università degli Studi di Cagliari, 2016. http://hdl.handle.net/11584/266760.
Texto completoAguiar, Neto Antonio Borges de. "Ocorrências de minerais pesados na plataforma continental interna/média oeste do Ceará". reponame:Repositório Institucional da UFC, 2015. http://www.repositorio.ufc.br/handle/riufc/18577.
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This study embraces the west continental shelf of Ceará (147 samples of marine sediments) and two fluvial courses (4 sediment samples of Curu and São Gonçalo rivers) to determine heavy minerals distribution with their possible provenances and economic potential. Sedimentary facies on the continental shelf were distinguished through the particle size and calcium carbonate content. Heavy minerals were investigated for their total content (%), relative abundance (%) of each mineral species, concentration in Kg/ton of predominant species, mineralogical index (RZi and ZRT) and grains imaging by SEM-EDS. In geoprocessing obtained the spatial distribution of data by Arcgis 10.1 and Surfer 10 got informations about bottom morphology of the continental. Multivariate analysis were included using Statistica 7.0 to aid in the interpretation of results. Heavy minerals were concentrated in Fortaleza chart (contents reached to 4.54%) at depths until 20 m in the litoclastic and litobioclastic sands. Among the 18 mineral species identified, ilmenite and tourmaline were embracing most of the continental shelf and with epidote and monazite presented content > 1 Kg/ton near São Gongaço do Amarante coast. Paleochannels and ancient beach-ridge were identified. The occurrence of typical regional metamorphic mineral paragenesis of rocks rich in aluminum suggests the provenance of Ceará Complex rocks (primary source) that occur both near the coast and outcrops directly on the continental shelf. Reworked sediments of Barreiras Formation, beach black sands and longshore drift sediments (secondary sources) contribute regionally in heavy mineral supply.Curu river influences ilmenite, tourmaline and epidote supply. Multivariate analyzes and RZi/ZTR variations corroborated with the dual nature provenance (primary and secondary) of the continental shelf sediments and expose a mixture of recente sediments with older reworked ones.
Este estudo abrange a plataforma continental oeste do Ceará (147 amostras de sedimentos marinhos) e dois cursos fluviais (4 amostras de sedimentos dos rios Curu e São Gonçalo) para determinar a distribuição dos minerais pesados com suas possíveis proveniências e potencial econômico. Distinguiram-se as fácies sedimentares da plataforma continental pela granulometria e teor de carbonato de cálcio. Os minerais pesados foram investigados pelos seus teores totais (%), abundâncias relativas (%) de cada espécie mineral, teores em Kg/ton das espécies predominantes, índices mineralógicos (RZi e ZRT) e imageamento dos grãos por MEV-EDS. No geoprocessamento obteve-se a espacialização dos dados pelo Arcgis 10.1 e informações da morfologia de fundo da plataforma continental com o Surfer 10. Incluíram-se análises multivariadas por meio do Statistica 7.0 para auxiliar na interpretação dos resultados. Os minerais pesados se concentraram na folha Fortaleza (teores de até 4,54%) em até 20 m de profundidade e nos domínios das areias litoclásticas e litobioclásticas. Dentre as 18 espécies minerais identificadas, a ilmenita e a turmalina foram as que abrangeram a maior parte da plataforma continental e juntamente com epídoto e monazita apresentaram teores > 1 Kg/ton próximo à costa de São Gonçalo do Amarante. Foram identificados paleocanais e antigas linhas de praia. A ocorrência da paragênese mineral típica de metamorfismo regional de rochas ricas em alumínio sugere a proveniência das rochas do Complexo Ceará (fonte primária) que ocorrem tanto próximo à costa como afloram diretamente na plataforma continental. Sedimentos retrabalhados da Formação Barreiras, areias pretas praiais e sedimentos de deriva litorânea (fontes secundárias) contribuem regionalmente no aporte de minerais pesados. O Rio Curu exerce influência no aporte de ilmenita, turmalina e epídoto. As análises multivariadas e as variações de RZi e ZTR corroboraram com a proveniência de natureza dual (primária e secundária) dos sedimentos plataformais, além de expor uma mistura de sedimentos recentes com sedimentos retrabalhados mais antigos.
Hunter, William Ross. "Carbon and nitrogen cycling across the bathyal continental margins : oxygen availability and organic matter quality as controls upon sediment community activity". Thesis, University of Aberdeen, 2012. http://digitool.abdn.ac.uk:80/webclient/DeliveryManager?pid=206993.
Texto completoRao, Alexandra Mina Fernandes. "Carbon and nitrogen cycling in permeable continental shelf sediments and porewater solute exchange across the sediment-water interface". Diss., Available online, Georgia Institute of Technology, 2006, 2006. http://etd.gatech.edu/theses/available/etd-11152006-163727/.
Texto completoMartial Taillefert, Committee Member ; Jay Brandes, Committee Member ; Markus Huettel, Committee Member ; Philip Froelich, Committee Member ; Ellery Ingall, Committee Member ; Richard A. Jahnke, Committee Chair.
Lashley, Justin Michael. "Reassessment of Geomorphic Features on the Continental Shelf off of Watch Hill, Fire Island National Sea Shore, NY". Thesis, State University of New York at Stony Brook, 2019. http://pqdtopen.proquest.com/#viewpdf?dispub=10842942.
Texto completoThe United States Bureau of Ocean Energy Management (BOEM)’s Sandy Needs Assessment collected geophysical and geotechnical data, related to beach nourishment activities, along the continental shelf south of Long Island between 2015–2017 in an area offshore the Fire Island National Sea Shore, near Watch Hill, NY. This new geological and geophysical data provides evidence of continuous and ongoing sand transport offshore of Fire Island National Sea Shore. New stratigraphic evidence shows the evolution, migration and erosion of shore-oblique sand ridges formed from the reworking of glacial outwash sand consistent with a conceptual process model. Three separate ridge features are related to each other with evidence of direct ridge migration in the region. Outwash fans and deltas likely provided the cores of mesoscale submarine ridges n the study area. Subsequent episodes of ridge erosion remobilized sand to feed the growth of ridges further west. The possibility of natural transport process actively delivering sand to the shore remains, but is not identified, and will require further work before these ridges can be sustainably utilized in nourishment activities.
Popescu, Speranta Maria. "Continental and Marine Environmental changes in Europe induced by Global Climate variability and Regional Paleogeography Changes". Habilitation à diriger des recherches, Université Claude Bernard - Lyon I, 2008. http://tel.archives-ouvertes.fr/tel-00350116.
Texto completoResults and research in progress
Using pollen grains analysis, I developed investigations on vegetation dynamics and paleoclimate reconstructions for the whole Mediterranean region and Western Europe extended to the Late Cenozoic (Jiménez-Moreno et al., 2007; Fauquette et al., 2006). Thanks to the high-chronologic resolution:
a. I established the response of regional vegetation to eccentricity forcing in SW Romania (Dacic Basin) and Black Sea (DSDP Site380) whatever the sediment types (Popescu, 2001, 2006; Popescu et al., 2006a);
b. I was the first to demonstrate the precession forcing on regional vegetation (Popescu et al., 2006b) through the Lupoaia pollen record (SW Romania);
c. in the frame of two PhD theses that I co-supervise, pollen grain and dinoflagellate cyst records from DSDP Site 380 (7 - 4 Ma) were completed from 4 Ma to Present in order to evidence the impact of glacial-interglacial cycles over the regional vegetation and to reconstruct the climate variability for the last 7 Ma;
d. I was the first to demonstrate the solar cycles forcing (Hale and Gleissberg cycles) on the regional vegetation (through the “Thermophilous trees / Artemisia” ratio) since the Last Glacial Maximum were evidenced in cored sediments from the Black and Marmara seas (unpublished data), that is a unique outcome.
Using the biometric approach on the dinoflagellate cysts in association with statistical analyses, I demonstrated that fluctuations in salinity are partially responsible for modifying size, shape and ornamentation of the cysts, providing the first reliable paleoecological and paloebiogeographic reconstructions of the brackish Paratethyan basins (Popescu et al., palynology , in press).
Simultaneously, I performed experimental cultures on a living-dinoflagellate species (Scrippsiella trifida): suggested relationships between cyst morphological variations and stress under controlled salinity are confirmed by the preliminary results, while reproduction rate seems also modified (unpublished data).
The multi-proxy (palynology, sedimentology and geochemistry) study on the Aral Sea, done by the first PhD student that I co-supervised, allowed not only the reconstruction of the regional paleoclimate and paleoenvironments, but also permitted to understand the atmosphere dynamics of the last 2 ka over the high latitudes (Sorrel et al., 2006, 2007).
Hence, my palynological and biological expertise offers an exclusive tool for establishing a continuous high resolution chronology, paleoclimatic, paleobiogeographic and paleoenvironmental reconstructions. This is particularly important for the basins impacted by important environmental changes, such as the Mediterranean and Black seas, the sediments of the latter being precisely dated for the first time by this approach.
I do no want to close this Introduction Section without addressing my largest acknowledgements to those who supported my researches and expressed their interest in my project, providing personal grants and/or financial assistance for achieving my researches, and especially the PhD and master – graduation students that I appreciated so much to co-supervise.
Van, de Poel Hendrik M. "Messinian marginal-marine and continental facies and their stratigraphy in the Eastern Almeria Province : SE Spain /". Toulouse : Université Paul Sabatier, Laboratoire de géologie sédimentaire et paléontologie, 1994. http://catalogue.bnf.fr/ark:/12148/cb35734114t.
Texto completoSierra, Jimenez Mara Johanna. "Parcs nationaux en transition vers des parcs nationaux naturels anthropisés (PNNa) ? Étude comparative de trois parcs nationaux naturels habités du Continent américain (Colombie, Guyane française, Québec)". Thesis, Pau, 2016. http://www.theses.fr/2016PAUU1010/document.
Texto completoThe evolution of international environmental policies and national and local conservation contexts gives increasing importance to the anthropic dimension within the national parks (category II UICN). Not only does this dimension takes into account the local population that lives permanently in these various natural areas, but also the economic actors who, legally or illegally, benefit from those protected areas (tourism, gold-washing, wood, etc.) or participate directly or indirectly in the process of the territorial elaboration of a national park. The integration of the anthropic aspect definitely help the emergence of new dynamics and strategies of collaborative management and policies. Building on political geography, socio-cultural geography and political ecology, this thesis aims to shed light how that anthropic dimension (sociocultural as well as economical) entails the transition of some protected areas from a classical type to a new category we identify as the “Nature and Anthropic National Park” (PNNa). We focus on three specific study cases in the American continent: the Amazonian park of the French Guiana, the Sea Park of Saguenay-Saint-Laurent of Québec, Canada, and the Amazonian Amacayacu National Park of Colombia. The systemic analysis of their structure and their functioning, as far as macrostructure of policies and microstructures of management are concerned, has allowed us to bring out that transition in the territorial management of these category II protected natural areas and the deriving conflicts for power
La evolución de las políticas de gobernanza medioambiental internacional y la transición de los contextos nacionales y locales de conservación, favorecen cada vez más la integración de la dimensión antrópica al interior de los parques nacionales (categoría II-UICN). Esta dimensión corresponde de una parte, a las poblaciones locales que habitan de manera permanente las diversas zonas de protección dentro del parque nacional, y de otra parte, a los actores económicos (legales e ilegales) que explotan el territorio protegido (Turismo, explotación minera, explotación de madera, etc), o que participan de manera directa o indirecta en los procesos de construcción territorial del parque nacional. La integración de la dimensión antrópica dentro de estos territorios naturales de protección favorece en consecuencia la emergencia de nuevas dinámicas y estrategias participativas de gestión y de gobernanza. A través de un triple enfoque científico construido mediante el cruce de diversos puntos de vista de la geografía política, de la geografía sociocultural y de la political ecology, esta tesis se interesa en el análisis de tres casos de estudio particulares del Continente americano. El objetivo de esta contribución es el de intentar mostrar, cómo la integración de la dimensión antrópica (sociocultural y económica) influencia la transición de algunos espacios naturales protegidos hacia una nueva configuración que nosotros proponemos identificar aquí bajo el nombre de “parques nacionales naturales antropizados – PNNa”.El análisis sistémico de la estructura y del funcionamiento de las macroestructuras de gobernanza y de las microestructuras de gestión participativa del Parque amazónico de la Guayana, en Francia, del Parque marino del Saguenay-Saint-Laurent en Quebec, Canadá, y del Parque nacional natural Amacayacu en Amazonia colombiana, nos permitieron poner en evidencia este tipo de transición en la gestión territorial de los espacios naturales protegidos de categoría II, así que los conflictos de poder que resultan de esta transformación
Xu, Weimu. "Carbon burial in continental and marine settings : lacustrine and marine records of major environmental change in deep time and their depositional and diagenetic consequences". Thesis, University of Oxford, 2016. https://ora.ox.ac.uk/objects/uuid:8838eda2-67a4-4946-a64a-e060d71247a2.
Texto completoFattal, Paul. "Etude geomorphologique et sedimentologique du plateau continental sud-armoricain". Nantes, 1986. http://www.theses.fr/1986NANT3004.
Texto completoAfter the analysis of the bathymetrics, sedimental and geological results of the 1966 to 1978 campagns, we are about to proceed upon the study of the shapes of the dynamics of the median and external continental shelf. This work distinguishes the inherited and living shapes, studies the interaction or retroaction of agents due to the permanent variations of the sea level during the plion quaternery era. It seems that the shapes due to a subaerian morphogenesis, the former coastal shapes and the living ones, are balanced whit the current agents of the present day
Neto, Antonio Borges de Aguiar. "Heavy minerals occurrences in the continental shelf inner/mean west of CearÃ". Universidade Federal do CearÃ, 2015. http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=13816.
Texto completoThis study embraces the west continental shelf of Cearà (147 samples of marine sediments) and two fluvial courses (4 sediment samples of Curu and SÃo GonÃalo rivers) to determine heavy minerals distribution with their possible provenances and economic potential. Sedimentary facies on the continental shelf were distinguished through the particle size and calcium carbonate content. Heavy minerals were investigated for their total content (%), relative abundance (%) of each mineral species, concentration in Kg/ton of predominant species, mineralogical index (RZi and ZRT) and grains imaging by SEM-EDS. In geoprocessing obtained the spatial distribution of data by Arcgis 10.1 and Surfer 10 got informations about bottom morphology of the continental. Multivariate analysis were included using Statistica 7.0 to aid in the interpretation of results. Heavy minerals were concentrated in Fortaleza chart (contents reached to 4.54%) at depths until 20 m in the litoclastic and litobioclastic sands. Among the 18 mineral species identified, ilmenite and tourmaline were embracing most of the continental shelf and with epidote and monazite presented content > 1 Kg/ton near SÃo GongaÃo do Amarante coast. Paleochannels and ancient beach-ridge were identified. The occurrence of typical regional metamorphic mineral paragenesis of rocks rich in aluminum suggests the provenance of Cearà Complex rocks (primary source) that occur both near the coast and outcrops directly on the continental shelf. Reworked sediments of Barreiras Formation, beach black sands and longshore drift sediments (secondary sources) contribute regionally in heavy mineral supply.Curu river influences ilmenite, tourmaline and epidote supply. Multivariate analyzes and RZi/ZTR variations corroborated with the dual nature provenance (primary and secondary) of the continental shelf sediments and expose a mixture of recente sediments with older reworked ones.
Este estudo abrange a plataforma continental oeste do Cearà (147 amostras de sedimentos marinhos) e dois cursos fluviais (4 amostras de sedimentos dos rios Curu e SÃo GonÃalo) para determinar a distribuiÃÃo dos minerais pesados com suas possÃveis proveniÃncias e potencial econÃmico. Distinguiram-se as fÃcies sedimentares da plataforma continental pela granulometria e teor de carbonato de cÃlcio. Os minerais pesados foram investigados pelos seus teores totais (%), abundÃncias relativas (%) de cada espÃcie mineral, teores em Kg/ton das espÃcies predominantes, Ãndices mineralÃgicos (RZi e ZRT) e imageamento dos grÃos por MEV-EDS. No geoprocessamento obteve-se a espacializaÃÃo dos dados pelo Arcgis 10.1 e informaÃÃes da morfologia de fundo da plataforma continental com o Surfer 10. IncluÃram-se anÃlises multivariadas por meio do Statistica 7.0 para auxiliar na interpretaÃÃo dos resultados. Os minerais pesados se concentraram na folha Fortaleza (teores de atà 4,54%) em atà 20 m de profundidade e nos domÃnios das areias litoclÃsticas e litobioclÃsticas. Dentre as 18 espÃcies minerais identificadas, a ilmenita e a turmalina foram as que abrangeram a maior parte da plataforma continental e juntamente com epÃdoto e monazita apresentaram teores > 1 Kg/ton prÃximo à costa de SÃo GonÃalo do Amarante. Foram identificados paleocanais e antigas linhas de praia. A ocorrÃncia da paragÃnese mineral tÃpica de metamorfismo regional de rochas ricas em alumÃnio sugere a proveniÃncia das rochas do Complexo Cearà (fonte primÃria) que ocorrem tanto prÃximo à costa como afloram diretamente na plataforma continental. Sedimentos retrabalhados da FormaÃÃo Barreiras, areias pretas praiais e sedimentos de deriva litorÃnea (fontes secundÃrias) contribuem regionalmente no aporte de minerais pesados. O Rio Curu exerce influÃncia no aporte de ilmenita, turmalina e epÃdoto. As anÃlises multivariadas e as variaÃÃes de RZi e ZTR corroboraram com a proveniÃncia de natureza dual (primÃria e secundÃria) dos sedimentos plataformais, alÃm de expor uma mistura de sedimentos recentes com sedimentos retrabalhados mais antigos.
Cussatlegras, Anne-Sophie. "Dynamique spatio-temporelle de la bioluminescence marine en mer d'Alboran et sur le plateau continental atlantique français". Brest, 2001. http://www.theses.fr/2001BRES2011.
Texto completoGuerra, Josefa Varela. "Interannual variability of nearbed sediment flux and associated physical processes on the Eel River shelf, Northern California, USA /". Thesis, Connect to this title online; UW restricted, 2004. http://hdl.handle.net/1773/11000.
Texto completoBraker, John M. "The Impact of Variability in Coastal Circulation on Plankton Distributions Along the Continental Shelf of Southeast Florida". NSUWorks, 1995. http://nsuworks.nova.edu/occ_stuetd/346.
Texto completoJordan, Tom A. R. M. "Gravity anomalies, flexure, and the long-term rigidity of the continental lithosphere". Thesis, University of Oxford, 2007. http://ora.ox.ac.uk/objects/uuid:9f803b42-522e-442b-9849-bb8e6c2a5494.
Texto completoMarsh, Daniel L. "TRACE METALS IN SEDIMENTS ON THE CONTINENTAL MARGINOF THE NORTHWEST ATLANTIC OCEAN". Wright State University / OhioLINK, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=wright1389654019.
Texto completoChauveau, Etienne. "Les marges continentales de Guinée et de Côte-d'Ivoire orientale : étude de géomorphologie sous-marine". Paris 4, 1994. http://www.theses.fr/1994PA040334.
Texto completoThe continental margins of Guinea and east Ivory-Coast associate rifted and transform segments in short distances. The transform features have been created since the early strikeslip motion at the beginning of the equatorial Atlantic. Thus, the margins have kept during all their evolution the marks of sedimentary transfers controlled by continental settling and hummocky topography first and marine sedimentation since the upper cretaceous. Since the time, structural barriers of both margins always induced morphogenic processes differentiation in a vertical plane. The Americans conjugate margins show that the structural framework is not necessarily the predominant criterion for the morphologic characteristics of transform margins. There indeed, the paleoceanographic and paleoclimatologic factors seem to have been very important. Nowadays, the understanding of global environmental systems allows modelling of tropical areas. Hence, the results of such investigations afford a better comprehension of the paleoenvironments, and can finally authorise paleogeomorphologic reconstitutions
DeCroix, David Scot. "Large-eddy Simulations of the Convective and Evening Transition Planetary Boundary Layers". NCSU, 2001. http://www.lib.ncsu.edu/theses/available/etd-20010319-182404.
Texto completoLarge-eddy simulation (LES) is a very useful tool in computationalfluid dynamics. The LES model allows one to solve a filtered set of theNavier-Stokes equations, thereby explicitly resolving scales of motionlarger than the discretization or grid size. Those motions smaller thanthe grid size are parameterized using a so-called subgrid scale model.
In this series of papers, we will use the TASS LES model, originallya cloud model, which has been modified to simulate planetary boundarylayer turbulence. We will first introduce the LES model and a newgrid-nesting method for the LES. Then we will present simulations ofthe convective planetary boundary layer, and then use the LES to studythe decay of convective planetary boundary layer turbulence to a stablystratified state.
The LES model has been modified to include a grid nesting capability.Grid meshes of higher resolution may be embedded within the LES enablingone to resolve smaller scales of motion (turbulence) than would bepossible by using a single grid mesh. The grid nesting methodology isdescribed in detail in Chapter 2.
In Chapter 3, the nested-grid LES will be applied to thesimulation of the convective planetary boundary layer. We will usea total of three grid meshes to increase the resolution in the surfacelayer, allowing a detailed analysis of the turbulence near the surface ofthe earth.
In Chapter 4, we will focus on applying Rayleigh Benardconvection criteria, using a linearized perturbation method,to the surface layer of a CBL produced by large-eddy simulation.Similarities and differences will be discussed between the LESproduced surface layer and classical Rayleigh-Benard convection theory.
In Chapter 5, using a large-eddy simulation model, we willexamine in detail the turbulent kinetic energy (TKE) budget during theevening transition. The simulation will be performed in order to compareto observations gathered at the Dallas-Fort Worth International Airport,Fort-Worth, TX. during September and October 1997.
In Chapter 6 the decay of planetary boundary layerturbulence during the evening transition will be studied. In previousstudies of the decay of turbulence, the effects of mean winds and shearsdue to pressure gradient on the turbulence decay was not considered.We propose to examine the effects of increasing geostrophic wind onthe convective boundary layer and its transition or decay to a stablecondition. Finally, the overall conclusions of each chapter will bepresented.
Ali, Heba. "THE EFFECT OF DEPTH ON DEVELOPMENT AND SEXUAL DIMORPHISM OF THE SONIC SYSTEM IN DEEP SEA NEOBYTHITINE FISHES: THE UPPER CONTINENTAL SLOPE". VCU Scholars Compass, 2016. http://scholarscompass.vcu.edu/etd/4095.
Texto completoBillington, Tyler. "Sedimentologic and Petrographic Evidence of Flow Confinement In a Passive Continental Margin Slope Channel Complex, Isaac Formation, Windermere Supergroup, British Columbia, Canada". Thesis, Université d'Ottawa / University of Ottawa, 2019. http://hdl.handle.net/10393/39727.
Texto completoNameroff, Tamara J. "Suboxic trace metal geochemistry and paleo-record in continental margin sediments of the eastern tropical North Pacific /". Thesis, Connect to this title online; UW restricted, 1996. http://hdl.handle.net/1773/8514.
Texto completoHightower, Gerald R. "Aviation proof of concept the transition of Marine Corps aviation maintenance computer assets and systems into the Navy Marine Corps Intranet /". Thesis, Monterey, California : Naval Postgraduate School, 2010. http://edocs.nps.edu/npspubs/scholarly/theses/2010/Mar/10Mar%5FHightower.pdf.
Texto completoThesis Advisor(s): Cook, Glenn. Second Reader: Oros, Carl. "March 2010." Description based on title screen as viewed on April 28, 2010. Author(s) subject terms: DT, OT, APOC, NTCSS, NMCI. Includes bibliographical references (p. 69-70). Also available in print.
Cowie, Leanne. "Determination of ocean continent transition structure, continent ocean boundary location and magmatic type at rifted continental margins". Thesis, University of Liverpool, 2014. http://livrepository.liverpool.ac.uk/2008044/.
Texto completoWebster, John Ackroyd III. "Design and Analysis of Low Reynolds Number Marine Propellers with Computational Fluid Dynamics (CFD) Transition Modeling". Diss., Virginia Tech, 2019. http://hdl.handle.net/10919/93038.
Texto completoDoctor of Philosophy
Small-scale marine propellers exhibit transition from laminar to turbulent flow in the region near the surface of the blades. Regions of laminar and turbulent flow on the blade surface contribute differently to the overall thrust and torque on the propeller. Prediction of flow transition in the design process for small-scale marine propellers can improve the accuracy of the thrust and torque prediction compared to modeling the flow as purely laminar or turbulent. Propeller thrust and torque can be modeled using computational fluid dynamics (CFD) simulations, where transition modeling is accomplished by solving a transport equation for the intermittency γ, which represents the percentage of time the flow in a given location is turbulent. In this work, a transition model is coupled to a high-fidelity full Reynolds stress turbulence model, which solves 6 transport equations to solve for each component of the Reynolds stress tensor. The Reynolds stress tensor represents the turbulent velocity fluctuations in the governing equations solved in the CFD simulation. This coupled transition and turbulence model is then validated using experimental results of flows with a number of different transition mechanisms. The coupled model is then tested with a series of model-scale propellers, with results of the CFD simulations compared to the experimental results. A method for the design of propellers with flow transition is presented which incorporates transition effects. The designs generated by this method are then optimized in a CFD framework which morphs the blade geometry to improve the ratio of the thrust produced by the propeller to the torque, which corresponds to a higher efficiency. Two design cases are presented: a propeller designed for open water operation, and a propeller design for a small autonomous underwater vehicle.