Готові списки джерел за темами / Marine fans

Добірка наукової літератури з теми "Marine fans"

Автор: Grafiati
Опубліковано: 10 грудня 2022
Оновлено: 28 січня 2023

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Статті в журналах з теми "Marine fans"

1

Cantalejo, Blanca, Kevin T. Pickering, Ken G. Miller, and Conall Mac Niocaill. "Chasing the 400 kyr pacing of deep-marine sandy submarine fans: Middle Eocene Aínsa Basin, Spanish Pyrenees." Journal of the Geological Society 178, no. 1 (September 29, 2020): jgs2019–173. http://dx.doi.org/10.1144/jgs2019-173.

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In an attempt to understand the relative importance of climate and tectonics in modulating coarse-grained sediment flux to a tectonically active basin during what many researchers believe to be a greenhouse period, we have studied the Middle Eocene deep-marine Aínsa Basin, Spanish Pyrenees. We use orbital tuning of many spectral gamma-ray-logged fine-grained siliciclastic sections, already shown to contain Milankovitch frequencies, in conjunction with a new high-resolution palaeomagnetic study through the basin sediments, to identify polarity reversals in the basin as anchor points to allow the conversion of a depth-stratigraphy to a chronostratigraphy. We use these data, in conjunction with a new age model incorporating new biostratigraphic data, to pace the development of the deep-marine sandy submarine fans over c. 8 million years. Timing for the sandy submarine fans shows that, unlike for the fine-grained interfan sediments, coarse-grained delivery to the basin was more complex. Approximately 72% of the sandy fans are potentially coincident with the long-eccentricity (400 kyr) minima and, therefore, potentially recording changing climate. The stratigraphic position of some sandy fans is at variance with this, specifically those that likely coincide with a period of known increased tectonic activity within the Aínsa Basin, which we propose represents the time when the basin was converted into a thrust-top basin (Gavarnie thrust sheet), presumably associated with rapid uplift and redeposition of coarse clastics into deep-marine environments. We also identify sub-Milankovitch climate signals such as the c. 41.5 Ma Late Lutetian Thermal Maximum. This study demonstrates the complex nature of drivers on deep-marine sandy fans in a tectonically active basin over c. 8 Myr. Findings of this study suggest that, even during greenhouse periods, sandy submarine fans are more likely linked with times of eccentricity minima and climate change, broadly consistent with the concept of lowstand fans. However, hysteresis effects in orogenic processes of mountain uplift, erosion and delivery of coarse siliciclastics via fluvial systems to coastal (deltaic) and shallow-marine environments likely contributed to the complex signals that we recognize, including the 2–3 Myr time gap between the onset of deep-marine fine-grained sediments in the early development of the Aínsa Basin and the arrival of the first sandy fans.Supplementary Materials: Filtered records for each of the analysed gamma-ray logged sections. Anchor points, SARs tables and graphs and alternative tuning sections are available at: https://doi.org/10.6084/m9.figshare.c.5132975
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BOULTON, G. S. "Push-moraines and glacier-contact fans in marine and terrestrial environments." Sedimentology 33, no. 5 (October 1986): 677–98. http://dx.doi.org/10.1111/j.1365-3091.1986.tb01969.x.

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3

Bryce, Monika, and Alison Sampey. "Kimberley marine biota. Historical data: soft corals and sea fans (Octocorallia)." Records of the Western Australian Museum, Supplement 84, no. 1 (2014): 101. http://dx.doi.org/10.18195/issn.0313-122x.84.2014.101-110.

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4

Qiu, Wenxian, Xianglong Jin, Clive Schofield, and Mingbi Li. "Preliminary considerations on the potential influence of submarine fans on marine delimitation." Acta Oceanologica Sinica 32, no. 12 (December 2013): 133–42. http://dx.doi.org/10.1007/s13131-013-0391-4.

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5

McDougall, N., P. J. Brenchley, J. A. Rebelo, and M. Romano. "Fans and fan deltas – precursors to the Armorican Quartzite (Ordovician) in western Iberia." Geological Magazine 124, no. 4 (July 1987): 347–59. http://dx.doi.org/10.1017/s0016756800016678.

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AbstractThe Armorican Quartzite (Lower Ordovician) is a very extensive sandstone body found throughout a large part of Iberia and Brittany; similar quartzites are present in north Africa and elsewhere. In Iberia it generally lies unconformably on a thick, folded, late Precambrian to Cambrian turbidite sequence (the Complexo Xisto-Grauváquico (CXG)), but there are some places where the quartzite has a conformable relationship with the underlying CXG. Where conformable the whole succession shows varied facies sequences including: (i) a regressive mud–sand sequence as a precursor to the main quartzite development, (ii) submarine fan sediments of the CXG passing up into slope and then shallow marine facies, or (iii) fluvially influenced breccio-conglomerates of a marginal fan delta passing up into shallow marine sediments.The inferred development of alluvial fans associated with fan deltas prograding into shallow marine environments implies steep slopes and the likelihood that faulting controlled some of the uplift. The mozaic pattern of differential uplift and subsidence throughout the region suggests that the CXG was affected by local block movements rather than by regional folding.The presence of upstanding blocks during the initial sedimentation of the Armorican Quartzite suggests that the quartz sand might have been derived from multiple sources dispersed throughout the area rather than from sources along a single shoreline at the margin of the depositional area.
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6

Wang, Jiahao, Xinong Xie, Xiong Pang, and Baojun Liu. "Storm-reworked shallow-marine fans in the Middle Triassic Baise area, South China." Sedimentary Geology 349 (March 2017): 33–45. http://dx.doi.org/10.1016/j.sedgeo.2016.12.007.

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7

Hussain, Arif, and Khalid Al-Ramadan. "Organic Matter Burial in Deep-Sea Fans: A Depositional Process-Based Perspective." Journal of Marine Science and Engineering 10, no. 5 (May 17, 2022): 682. http://dx.doi.org/10.3390/jmse10050682.

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Organic matter burial in the deep-sea fan sediments is an important component of the long-term carbon cycle. Although there is increasing recognition of the importance of organic matter in deep-sea sediments, a major focus has been on mudstones, commonly interpreted as the background sediments, deposited by pelagic or hemipelagic vertical suspension fallout in low-energy fan environments. Emerging evidence suggests that relatively coarse-grained sediment gravity flow deposits (e.g., turbidites and hybrid event beds) can also store a significant quantity of organic carbon, implying that a wide range of depositional processes can result in the concentration and enrichment of organic matter in submarine fans. However, the role of these processes on carbon burial is still not fully understood. This review aims to discuss the impact of three widely documented deep-sea depositional mechanisms/processes, namely vertical suspension settling, grain-by-grain (incremental aggradation), and the en-masse deposition on distribution, burial, and preservation of organic matter in deep-marine deposits. Organic matter accumulated from slowly settling suspension in mud caps (Te or H5 divisions of turbidites and hybrid beds, respectively) is prone to higher oxidation compared to the carbon buried in sandy components of turbidity currents (Ta-Tc units) and hybrid beds (H2/H3 divisions). The burial of organic matter in sandy parts of the deposits has important implications for understanding the fundamental physical processes that control carbon accumulation and preservation in deep-marine rock record.
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8

Khramtsova, Alena V., Sergey I. Pakhomov, Nikita Y. Natchuk, Мaria P. Kalashnikova, Sergey V. Romashkin, Artem D. Musikhin, and Nadezhda G. Semenova. "Facies models of the Achimov Formation of East-Urengoiskoe license as the basis for optimizing exploration and field development patterns." Georesursy 22, no. 3 (September 30, 2020): 55–61. http://dx.doi.org/10.18599/grs.2020.3.55-61.

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The results of sedimentological core analysis of the Achimov Formation (Upper Valanginian, Lower Cretaceous) confirm that it was formed by higher efficiency systems of submarine fans in (relatively) deep marine basin. Lithofacies models of Ach5-6 were generated, well correlation was performed based on the comprehensive analysis of core, well logging and seismic data. Distributary channels and proximal parts of depositional lobes are characterized by the best reservoir properties.
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9

Mouslopoulou, Vasiliki, John Begg, Alexander Fülling, Daniel Moraetis, Panagiotis Partsinevelos, and Onno Oncken. "Distinct phases of eustatic and tectonic forcing for late Quaternary landscape evolution in southwest Crete, Greece." Earth Surface Dynamics 5, no. 3 (September 8, 2017): 511–27. http://dx.doi.org/10.5194/esurf-5-511-2017.

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Abstract. The extent to which climate, eustasy and tectonics interact to shape the late Quaternary landscape is poorly known. Alluvial fans often provide useful indexes that allow the decoding of information recorded on complex coastal landscapes, such as those of the eastern Mediterranean. In this paper we analyse and date (using infrared stimulated luminescence (IRSL) dating) a double alluvial fan system on southwest Crete, an island straddling the forearc of the Hellenic subduction margin, in order to constrain the timing and magnitude of its vertical deformation and discuss the factors contributing to its landscape evolution. The studied alluvial system is exceptional because each of its two juxtaposed fans records individual phases of alluvial and marine incision, thus providing unprecedented resolution in the formation and evolution of its landscape. Specifically, our analysis shows that the fan sequence at Domata developed during Marine Isotope Stage (MIS) 3 due to five distinct stages of marine transgressions and regressions and associated river incision, in response to sea-level fluctuations and tectonic uplift at averaged rates of ∼ 2.2 mm yr−1. Interestingly, comparison of our results with published tectonic uplift rates from western Crete shows that uplift during 20–50 kyr BP was minimal (or even negative). Thus, most of the uplift recorded at Domata must have occurred in the last 20 kyr. This implies that eustasy and tectonism impacted the landscape at Domata over mainly distinct time intervals (e.g. sequentially and not synchronously), with eustasy forming and tectonism preserving the coastal landforms.
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Ferguson, Mark E., John WF Waldron, and Wouter Bleeker. "The Archean deep-marine environment: turbidite architecture of the Burwash Formation, Slave Province, Northwest Territories." Canadian Journal of Earth Sciences 42, no. 6 (June 1, 2005): 935–54. http://dx.doi.org/10.1139/e04-070.

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The Slave Province is an Archean craton that contains an unusually large proportion of preserved sedimentary rock, including thick turbidite successions. The Burwash Formation is exposed in the southern Slave Province between the Anton and Sleepy Dragon basement massifs. At the base of the succession, volcanics and clastic metasedimentary rocks of the Raquette Lake Formation record initiation of the basin in a rifted arc environment. These are overlain by thin black slates representing a transgression, followed by well over 5 km of Burwash Formation metamorphosed turbiditic sandstones and slates interspersed with thin felsic tuff layers. Lateral correlation within the formation is possible using airphotos and recognizable tuff units. Burwash Formation sandstones include thinly bedded units displaying Bouma sequences and thicker bedded units with scour-and-fill structures and stratification bands, characteristic of dense sediment gravity flows. The sedimentary rocks are organized in architectural elements that include channel-fill sandstones and conglomerates, muddy levees, interchannel sandstones resembling high-amplitude reflection packages (HARPs) described from modern fans, and possible depositional lobes. The overall sedimentary architecture was probably controlled by events in the tectonically active source area or areas. The Archean turbidites resemble their Phanerozoic and modern analogues, although they show less voluminous levees, and are generally less organized, than large modern passive-margin fans, which probably have no equivalents in the Archean.
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Більше джерел

Дисертації з теми "Marine fans"

1

Chik, Shun-wah, and 戚舜華. "Internal sedimentology of washover deposits in Tai Long Wan, HongKong." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2010. http://hub.hku.hk/bib/B45161331.

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2

Ghila, Abdurazag M. "Numerical investigation of recess casing treatments in axial flow fans." Thesis, Cranfield University, 2003. http://dspace.lib.cranfield.ac.uk/handle/1826/7495.

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T he casing treatment technique for the axial fan has never been more significant since its potential applications were recognized in gas turbines, tunnel ventilation and many other industrial applications where the axial fan would benefit from the casing treatment. In the last two decades experimental investigations were carried out at Cranfield University to examine the influence of recess casing treatment on stall margin, operating efficiency and flow field of a low-speed axial flow fan. They showed more than 50% improvement in the stall margin with a negligible loss in the efficiency. However, a little work has been done on the numerical simulation of casing treatments due to its complexities, even though in recent years computational fluid dynamics [CFD] analysis has been very active in the prediction of various phenomena in turbomachinery. This work presents numerical investigation of flow in a single axial-flow fan with and without recess casing treatment. It involves the detailed effect of the recess casing on stall margin improvement as well as its influence on global performance parameters. The project offers a contribution to the understanding of the physical processes occurring when approaching stall and the working mechanism by which recess casing treatments improve stall margin. A Reynolds-Averaged Navier-Stokes CFD code was used for the analysis using steady and unsteady simulations. The numerical investigation of the overall performance, efficiency and work-input characteristics of the fan were found to agree very well with the previously reported experimental results. The effect of casing treatment was investigated using two types of configurations, vaneless and vaned casing. The vaneless casing treatment produced a sizeable stall margin improvement with a measurable loss in both pressure rise and efficiency. The recess was fitted later with vanes and was shown to offer both a further stall margin improvement and an increase in the pressure rise coefficient without any significant drop in efficiency at design conditions. The effect of number of vanes inside the recess was also investigated by doubling and halving the number of vanes originally adopted. The predicted results highlighted the importance of the vane inside the casing. Unsteady simulations for the fan with solid and treated casing were carried out. The solid casing simulated for a single blade passage as well as for the entire fan containing all 27 blades highlighted the flow physics of the tip stall growth process, as a large amount of radial flow injected from the hub at the blade suction side near the trailing edge towards the outer casing and occupy this through a mechanism of radial low momentum flow transport. This transport process is the main contributor to the very large separation observed in the shroud region in addition to the locally induced separation due to high blade loading and tip clearance. Although the examination of the unsteady simulation of the recess treatment cavities does not offer an image of large scale unsteady activity at the flow condition investigated, this is on itself quite significant and enables the drawing of an important conclusion namely that large casing treatments rely primarily on a steady-state flow process. The corollary of this conclusion is of course that a steady-state simulation should then be sufficient to capture the essential features of the recess treatment.
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3

Standl, Marie [Verfasser], and Berthold [Akademischer Betreuer] Koletzko. "FADS gene variants, diet and atopic phenotypes and lipids in children / Marie Standl. Betreuer: Berthold Koletzko." München : Universitätsbibliothek der Ludwig-Maximilians-Universität, 2013. http://d-nb.info/1038703638/34.

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4

Marin, Lucas [Verfasser], та J. [Akademischer Betreuer] Gescher. "Charakterisierung des β‑Fass-Proteins MtrB = Characterization of the β‑barrel protein MtrB / Lucas Marin ; Betreuer: J. Gescher". Karlsruhe : KIT-Bibliothek, 2020. http://d-nb.info/122302783X/34.

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5

Jahani, Salman. "Tectonique salifère, plissement et fracturation dans les provinces du Fars Oriental et le domaine marin adjacent du Golfe Persique (Iran)." Cergy-Pontoise, 2008. http://biblioweb.u-cergy.fr/theses/08CERG0368.pdf.

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La région d’étude est située à l’extrémité orientale du Zagros, à proximité du prisme d’accrétion du Makran, des Montagnes d’Oman et du golfe Persique. Ce système orogénique résulte de la collision en cours entre les plaques Arabe et Iran-Central. La caractéristique principale de la ceinture de plis du Zagros oriental (provinces du Fars et de Bandar Abbas) est l’existence d’un nombre important de diapirs de sel (sel d’Hormuz). La morphologie actuelle des diapirs de sel permet de proposer une typologie. Ainsi, nous proposons six différents types qui représentent aussi autant de stades d’évolution des structures au cours d’une histoire longue et complexe. Nous montrons que tous, ou presque tous, les diapirs étaient déjà actifs avant le plissement soit sous la forme de diapirs perçants, constituant des îles, soit sous la forme de dômes enfouis, actifs depuis le Paléozoïque Inférieur. Ces structures furent réactivés ultérieurement par des apports sédimentaires, des événements tectoniques (l’orogenèse du Zagros) et l’érosion de surface. Dans le détail, chaque diapir montre une évolution individuelle dépendant de sa position dans le système. Pendant l’orogenèse du Zagros, la formation d’Hormuz fut utilisée comme décollement basal séparant une couverture sédimentaire de 10 à 15 km d’épaisseur du socle Panafricain et de sédiments pré-Hormuz. Pendant l’orogenèse du Zagros (fin du Cénozoïque), des plis de décollement se développèrent sur un domaine qui était déjà ponctué par des diapirs de sel. Pour comprendre ce dispositif particulier, nous avons construit quatre coupes géologiques depuis le Golfe Persique, peu déformé, jusqu’aux zones internes du Zagros en utilisant de très nombreuses données de surface et de sub-surface. Le taux de raccourcissement de la partie plissée des coupes reste faible, moins de 10%. Les structures salifères pré-existantes influencent fortement tout à la fois la localisation et la direction des plis. C’est aussi ce que confirme des expériences analogiques originales
The studied area is located at the eastern tip of the Zagros system, close to the Makran accretionary prism Oman Mountains and Persian Gulf. This orogenic system results from the ongoing collision between the Arabian and Central-Iran plates. The main characteristic of the eastern Zagros fold thrust belt (Fars and Bandar-Abbas provinces) is the wide distribution of Hormuz salt diapirs. The present-day surface morphology of salt diapirs can be categorized into six types, which we suggest represent different stages in a long and complex history. We show that almost all the diapirs were already active prior to Zagros folding either as emergent diapirs forming islands or as buried domes initiated at as early as the Lower Paleozoic. They have been reactivated by subsequent sedimentary supply, tectonic events and surface erosion. In fact, each salt diapir shows individual evolution depending of their position in the system. During Zagros orogeny, the Hormuz salt layer acted as basal decollement level decoupling the basement (including pre-Hormuz sediments) from 10 to 15 km thick sedimentary cover. Salt cored detachment folds with variable trends developed during the Late Cenozoic in a domain, which was already punctuated by salt domes or diapirs. To understand such a particular layout, we constructed four geological cross-sections from the poorly deformed Persian Gulf to the inner part of Zagros Fold-Thrust Belt, using an important subsurface and surface data set. The Amount of shortening in the folded part of the sections remains low, less than 10%. Pre-existing salt structures (diapirs and dawn-building) strongly influenced both on the localization of folds and the direction of fold axes as also evidenced by original analogue experiments
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Jahani, Salman Frizon de Lamotte Dominique. "Tectonique salifère, plissement et fracturation dans les provinces du Fars Oriental et le domaine marin adjacent du Golfe Persique (Iran)." [S.l.] : [s.n.], 2009. http://biblioweb.u-cergy.fr/theses/08CERG0368.pdf.

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7

Van, Noord Kenrick A. A. "Deep-marine sedimentation and volcanism in the Silverwood Group, New England Fold Belt, Australia." Thesis, Queensland University of Technology, 1999.

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Анотація:
In eastern Australia, the New England Fold Belt (NEFB) comprises an ancient convergent margin that was active from the Paleozoic until the late Mesozoic. Considerable effort has been expended in understanding the development of this margin over the past twenty years. However, proposed tectonic models for the orogen have either been too broad, ignoring contradictory local evidence, or too locally specific without paying attention to the 'big picture'. The research presented in this work addresses the issue of appropriate scale and depth of geological detail by studying the NEFB at the terrane-scale. Using one succession, the Silverwood Group of southeast Queensland, this work demonstrates that detailed sedimentological studies and basin analysis at the terrane-scale can help to refine hypotheses regarding the tectonic evolution of the NEFB. The Silverwood Group (Keinjan terrane), located approximately 140 km southwest of Brisbane, Australia, is a succession of arc-related basins that developed within an ancient intraoceanic island-arc during the mid-Cambrian to Late Devonian. From the base of the succession, the group consists of five formations totalling -9700 m. These include the Risdon Stud Formation (2500 m), Connolly Volcanics (2400 m), Bald Hill Formation (2450 m), Ormoral Volcanics (600 m) and the Bromley Hills Formation (1700 m). The Long Mountain Breccia Member (300m) is a separate unit which forms the lower part of the Bromley Hills Formation. The entire succession has been thrust west over the Late Devonian to Early Carboniferous Texas beds. Elsewhere, the Silverwood Group is unconformably overlain by and faulted against Early to Late Permian units including the Rokeby beds, Wallaby beds, Tunnel beds, Fitz Creek beds, Eight Mile Creek beds, Rhyolite Range beds and Condamine beds. Of these Permian units, all but the Condamine beds form part of the Wildash Succession. To the west, southwest and south, the Silverwood Group is intruded by the Late Triassic Herries and Stanthorpe Adamellites. All of these sequences and the two plutonic intrusives are unconformably overlain by the Jurassic sediments of the Marburg Sandstone. The Silverwood Group and Texas beds consist of various lithologies including grey, purple- grey, green and green-grey volcaniclastic conglomerates, sandstones, siltstones or mudstones, massive and laminated chert, polymict or monomict breccias, muddy breccias, muddy sandstones, and volcanic rocks. Volcanic rocks include various tholeiitic metabasites, dolerite, meta-andesites and infrequent metadacite. In the Silverwood Group, these volcanic rocks are often accompanied by mafic pyroclastic rocks (e.g. peperite and hyaloclastite). Facies analyses of these lithologies has led to the recognition of 19 deep-marine turbiditic and volcanic/volcaniclastic facies that were deposited by three main processes: i) gravity-flow processes (e.g. low- and high-density volcaniclastic turbidites and mass-flows), ii) chemical/biological processes (siliceous oozes- chert) and iii) direct initiation by volcanic processes (e.g. flows, hypabyssal intrusions and associated pyroclastic facies). For the Silverwood Group, the defined facies occur in distinct vertical associations that form recognisable 3rd and 4th-order architectural elements such as channel, levee, suprafan lobe, outer-fan, basin plain, mass transport complex, volcanic flows, syn-sedimentary sills and syn-sedimentary emergent cryptodomes. These architectural elements are represented in a series of deep-marine depositional environments including slope, shelf-edge failure, submarine-fan and subaqueous basaltic volcanoes. The Risdon Stud Formation and parts of the Connolly Volcanics were deposited along a 'normal' clastic or mud, mud/sand-rich and/or sand/mud-rich slope. Both upper and lower slope environments are represented and in both formations, the slope is speculated to have faced eastwards and prograded away from an active arc located west. Sediments from both successions accumulated at palaeodepths of 1200 to 2000 m. Although sediments from the upper part of the Bald Hill Formation were also deposited on a slope, these sequences have subsequently collapsed into the depocentre to form extensive slump deposits accompanied by olistoliths of older arc crust. The lower part of the Bald Hill Formation formed by similar processes, although the failure was far more extensive (>20 km along strike). This latter part of the formation is interpreted to be a major shelf-edge failure succession. Upper parts of the Bald Hill Formation also accumulated at palaeodepths of 1200 to 2000 m, but the deposition of these sediments occurred farthest from the shelf and at the greatest depth compared to the Risdon Stud Formation and Connolly Volcanics. Lower parts of the Bald Hill Formation were deposited at palaeodepths of approximately 1700 m. Subaqueous basaltic volcanoes are prominent in the Connolly Volcanics, Bald Hill Formation and Ormoral Volcanics. In the Bald Hill Formation, igneous rocks were emplaced into the shelf-edge failure succession as a series of syn-sedimentary sills and cryptodomes. These high-level hypabyssal rocks occasionally became emergent above the sediment-water interface, whereupon they were partially resedimented. In some parts of the Bald Hill Formation, the hypabyssal intrusions were blanketed by basin plain deposits that are contemporaneous with the slumps and olistoliths in the upper part of the formation. The intrusive rocks were emplaced at 1700 m palaeodepth. Unlike the Bald Hill Formation, the Ormoral Volcanics and lower parts of the Connolly Volcanics form thick accumulations of extrusive volcanic and pyroclastic rocks that built a significant volcanic pile. Volcanic and pyroclastic facies within these successions were deposited proximal to their source (0-10 km of vent). Extrusive rocks within the Ormoral Volcanics are thought to be derived from intrabasinal fissure-vents located at palaeodepths of 1700 to 3100 m. Igneous rocks from the Connolly Volcanics, Bald Hill Formation and Ormoral Volcanics have the petrological and geochemical characteristics of back-arc basin basalts (BAB) that were sourced from undepleted to slightly enriched Fertile MORB Mantle-wedge (FMM). The FMM material was variably enriched in trace elements by fluids derived from the subducting slab prior to emplacement of the igneous rocks. Immediately following emplacement, these rocks were hydrothermally metamorphosed under conditions of low-pressure and transitional low to high-temperature (200-300 °C). By contrast, igneous rocks within the Texas beds lack enrichment in subduction components and are characteristic of N-MORB. The Bromley Hills Formation is a sand-rich point-source submarine fan deposited at palaeodepths of 500 to 2000 m. The fan was initiated by a mass transport complex resulting from subaerial collapse of a basaltic-andesitic stratovolcano. The submarine fan is characterised by two repetitive stages of retrogressive sedimentation during which channel-levee elements (inner-fan channels) are overlain by suprafan lobe elements (mid-fan) and then by outer-fan deposits as sea-level rises within the depocentre. Both inner-fan channels and suprafan lobes show centralised stacking patterns with limited lateral migration that indicate the depocentre was laterally restricted during sedimentation (e.g. submarine ridges). The Bromley Hills Formation exhibits all the characteristics typical of an active margin fan that formed by a combination of tectonic stage initiation followed by eustatically controlled regressive deposition. Volcaniclastic sediments of the Silverwood Group range in composition from lithic to lithic- feldspathic wackes and arenites, although they are mainly lithic or feldspathic-lithic wackes and arenites. Many samples are tuffaceous (25-75% pyroclasts), particularly those from the Connolly Volcanics, Ormoral Volcanics and Bromley Hills Formation. Samples in the Bald Hills Formation and Texas beds can be classified as quartz-rich. The majority of the Silverwood Group was sourced from an undissected intraoceanic island-arc, although sediments within the Bald Hill Formation exhibit a provenance that is characteristic of uplift within the arc (recorded as a 'strike-slip continental arc' model). Epiclastic sediments from the Texas beds were sourced from a transitional to dissected continental arc. Formations of the Silverwood Group were mostly deposited in a series of intra-arc basins within an ancient intra-oceanic island arc, although the lowermost formation developed in a marginal basin (Risdon Stud Formation). All of the basins were located east of the active arc (behind the arc), keeping in mind the present location of the Group relative to the Texas-Coffs Harbour megafold. The entire succession formed during four-phases of arc-related basin development that coincide with major changes in the strain regime of the arc. From the base of the succession, these changes are: I) mid Cambrian to late Silurian marginal basin sedimentation- relative compression within the arc (Risdon Stud Formation), II) late Silurian to Early Devonian intra-arc rifting- relative extension within the arc (Connolly Volcanics), Ill) Early to early Middle Devonian basin collapse followed by intra-arc rifting- relative extension to compression (Bald Hill Formation and Ormoral Volcanics) and IV) early Middle to Late Devonian intra-arc submarine fan sedimentation- relative compression (Bromley Hills Formation). Comparing the Silverwood Group against equivalent terranes of Cambrian to Devonian age within the New England Fold Belt (NEFB) suggests that the Gamilaroi terrane, Calliope Volcanic Assemblage, Willowie Creek beds and Silverwood Group all formed as one intraoceanic island-arc during the Early to Late Devonian. Prior to this, significant differences in the sedimentological evolution of these terranes suggests that they occupied different positions relative to each other within the one arc. It is proposed that the NEFB formed as a result of dual west-directed subduction zones during the Cambrian to Middle Devonian period. During this time, a single intraoceanic island-arc located seaward of the Australian craton developed above a west-directed subduction zone. This arc was separated from the craton by a marginal sea. A second west-directed subduction zone was located beneath a continental arc developed on the Australian craton. Cambrian to Early Devonian terranes within and along the Peel Fault are proposed to form a part of the ancient subduction zone present beneath the intraoceanic island-arc (Weraerai and Djungati terranes). Collision of the intraoceanic island-arc occurred during the Late Devonian, at which point west-directed subduction occurred beneath the Australian craton and the accreted intraoceanic island-arc. Following collision, a new continental volcanic arc was established that was active during the Late Devonian to Early Carboniferous.
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Gu, Fang [Verfasser], Hermann [Akademischer Betreuer] Behling, Hermann [Gutachter] Behling, Markus [Gutachter] Hauck, and Erwin [Gutachter] Bergmeier. "Late Quaternary vegetation, climate and ocean dynamics inferred from marine sediment cores off southeastern South America / Fang Gu ; Gutachter: Hermann Behling, Markus Hauck, Erwin Bergmeier ; Betreuer: Hermann Behling." Göttingen : Niedersächsische Staats- und Universitätsbibliothek Göttingen, 2018. http://d-nb.info/1166399842/34.

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9

Mansor, Sandra. "Le processus d'avulsion : enregistrement stratigraphique et sédimentologique : application aux éventails turbiditiques de l’Amazone et du Zaïre." Brest, 2009. http://www.theses.fr/2009BRES2049.

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Grâce aux données de forages ODP du Leg 155, corrélées aux coupes sismiques haute résolution de la campagne Lobestory d’Ifremer, l’éventail géant de l’Amazone est devenu une zone privilégiée pour étudier l’évolution des systémes chenaux-levées et le processus d’avulsion qui régit l’architecture des systémes turbiditiques. Les travaux antérieurs avaient montré que le processus d’avulsion est un des processus fondamentaux de la construction des édifices turbiditiques. Il aboutit au changement brutal du cours d’un chenal et à son abandon en aval du point d’avulsion. Ce processus et les phénoménes qui en découlent (courants non-confinés, rupture de profil d’équilibre du chenal, etc. ) sont à l’origine d’une distribution sédimentaire particulière, avec des dépôts grossiers (HARPs) en semelle des chenaux. Dans le travail présenté, les paquets de réflecteurs de fortes amplitudes (HARPs) situés à la base de ces systèmes fortement aggradant, ont pu étre caractérisés en sismique comme la superposition de 4 corps sismiques élémentaires correspondant à des processus de mise en place distincts. Ils peuvent étre décrits comme une amalgamation de petites unités sableuses, chenalisées ou non, mises en place pa une succession de courants de turbiditié très sableux et de haute densité. L’étude sismique et bathymétrique de corps particuliers repérés dans l’éventail du Zaïre a permis de compléter notre connaissance des premiers (effondrement de la levée) et derniers stades (abandon du chenal père et début d’aggradation du chenal fils aprés dépôts des HARPs). Ces résultats ont permis de préciser les modèles d’avulsion proposés jusqu’ici
Our study focuses on the avulsion process, the key process for the depocenter migration of stacked channel-levee systems in the deepsea. To present, the avulsïon process has been explained as the abandonment of a channel (parent channel) and the birth of a new one (new channel). A true indice of avulsion has been given by the detection of the HARPs, a seismic term known since the 80s for highamplitude reflection packets at the base of new channel-levee systems. The HARPs are suggested, in analogy to the studies from ODP Leg 155 of the Amazon Fan, to be sandy deposits in lows adjacent to breached parent channels. Our present work, by re-visiting the Amazon Fan with multichannel high-resolution seismic data, highlights the great complexity of the HARPs architecture and their lithological heterogeneity. The study of some specific zones within the Zaïre Fan allowed revealing both the earliest stages of an avulsion process related to levee breaches and first splays linked to unconfined flows on the levee, and the latest stage of this process, with the first levee deposition and evolution following the HARPs deposition. These results provide new insights for the understanding of the processes involved during an avulsion event (levee breach, HARPs accumulation, levee aggradation). By describing the inter-relationship of the different architectural sub-bodies of the HARPs and giving details on both the earliest and latest stages of the avulsion, our results also provide clues to refine the previous conceptual models and reach a higher resolution knowledge of this process
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Turakiewicz, Gwladys. "Les mécanismes forçants dans les éventails turbiditiques de marges matures : exemple de l'éventail quaternaire du Congo." Montpellier 2, 2004. http://www.theses.fr/2004MON20198.

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Книги з теми "Marine fans"

1

Tarquin, Teale C., Leggett Jeremy K, and Zuffa G. G. 1943-, eds. Marine clastic sedimentology: Concepts and case studies : a volume in memory of C. Tarquin Teale. London: Graham & Trotman, 1987.

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Reimnitz, Erk. Are north slope surface alluvial fans pre-Holocene relicts? Washington: U.S. G.P.O., 1998.

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Hai yang jing ji tong ji fang fa yu shi jian. Beijing: Hai yang chu ban she, 2011.

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Ming Qing Guangdong hai yun yu hai fang. Aomen: Aomen da xue she hui ke xue ji ren wen xue yuan zhong wen xi Zhongguo wen hua yan jiu zhong xin, 2008.

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Xian dai chuan bo dong li zhuang zhi de jie neng yu pai fang kong zhi ji shu. Dalian Shi: Dalian hai shi da xue chu ban she, 2013.

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6

"Hai yang huan bao yu hai zai fang fan" bian xie zu, ed. Hai yang huan bao yu hai zai fang fan. Guangzhou Shi: Guangdong shi jie tu shu chu ban gong si, 2011.

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7

Zhongguo jiao tong yun shu gai ge kai fang 30 nian: Shui yun juan. Beijing: Ren min jiao tong chu ban she, 2009.

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8

Zhongguo hai shi: Jing ji fa zhan fang shi xin ding wei = Zhongguo haishi jingji fazhan fangshi xin dingwei. Beijing: Ren min chu ban she, 2013.

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9

US GOVERNMENT. An Act to Require the Head of Any Federal Agency to Differentiate between Fats, Oils, and Greases of Animal, Marine, or Vegetable Origin, and Other Oils and Greases, in Issuing Certain Regulations, and for Other Purposes. [Washington, D.C.?: U.S. G.P.O., 1995.

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10

Hang tian ce liang chuan chuan zi shu ju chu li fang fa. Beijing: Guo fang gong ye chu ban she, 2009.

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Частини книг з теми "Marine fans"

1

Mulder, Thierry, and Heiko Hüneke. "Deep-Sea Fans." In Encyclopedia of Marine Geosciences, 1–2. Dordrecht: Springer Netherlands, 2013. http://dx.doi.org/10.1007/978-94-007-6644-0_52-2.

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Mulder, Thierry, and Heiko Hüneke. "Deep-Sea Fans." In Encyclopedia of Marine Geosciences, 1–2. Dordrecht: Springer Netherlands, 2015. http://dx.doi.org/10.1007/978-94-007-6644-0_52-3.

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Mulder, Thierry, and Heiko Hüneke. "Deep-sea Fans." In Encyclopedia of Marine Geosciences, 156. Dordrecht: Springer Netherlands, 2016. http://dx.doi.org/10.1007/978-94-007-6238-1_52.

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Sargent, J. R., and R. J. Henderson. "Marine (n-3) polyunsaturated fatty acids." In Developments in Oils and Fats, 32–65. Boston, MA: Springer US, 1995. http://dx.doi.org/10.1007/978-1-4615-2183-9_2.

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5

Dyerberg, J. "Fats from Marine Animals in Human Nutrition." In Fat Production and Consumption, 113–22. Boston, MA: Springer US, 1987. http://dx.doi.org/10.1007/978-1-4615-9495-6_12.

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6

Batist, Marc De, Philip J. Bart, and Heinz Miller. "Trough-Mouth Fans: Crary Fan, Eastern Weddell Sea, Antarctica." In Glaciated Continental Margins, 276–79. Dordrecht: Springer Netherlands, 1997. http://dx.doi.org/10.1007/978-94-011-5820-6_93.

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7

Dyerberg, J. "Fats from marine animals in human nutrition and prevention of cardiovascular diseases." In Atherosclerosis and Cardiovascular Diseases, 261–67. Dordrecht: Springer Netherlands, 1987. http://dx.doi.org/10.1007/978-94-009-3205-0_33.

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8

Puppione, Donald L., R. J. Jandacek, S. T. Kunitake та D. P. Costa. "Marine Mammals: Animal Models for Studying the Digestion and Transport of Dietary Fats Enriched in w-3 Fatty Acids. Positional Analyses of Milk Fat Triacylglycerol Molecules". У Dietary ω3 and ω6 Fatty Acids, 361–67. Boston, MA: Springer US, 1989. http://dx.doi.org/10.1007/978-1-4757-2043-3_33.

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9

"Mitigating Impacts of Natural Hazards on Fishery Ecosystems." In Mitigating Impacts of Natural Hazards on Fishery Ecosystems, edited by Dwayne Meadows and Deborah Brosnan. American Fisheries Society, 2008. http://dx.doi.org/10.47886/9781934874011.ch26.

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<em>Abstract</em>.—The 2004 Indian Ocean tsunami left a vast amount of destruction in its wake on land and in the sea. About 60% of coral reefs in the affected areas of Thailand were damaged, at least in the shallowest 10–20-m (33–66-ft) depth zones. Many damaged reef, beach, and mangrove areas in Thailand and Sri Lanka were high value tourist attractions or provided other important ecosystem goods and services. We were part of a fortuitous partnership of people with experience in reef restoration, coral reef science, marine debris removal, construction, professional scuba diving, business, marketing, and environmental nongovernmental organizations. We helped organize and fund multiple restoration and cleanup projects that restored damaged and detached sea fans in Similan Islands Marine National Park, restored hard corals, removed more than 453.59 metric tons of marine debris, and provided sustainable management advice to local stakeholders and decision makers. We later became involved in advising emergency management agencies on disaster preparedness and response. We use our reef-dominated experiences as a case study to suggest broader lessons learned for natural scientists to be involved in, and for emergency managers to consider, for mitigating and planning for future natural disaster impacts on fishery ecosystems. We also provide some coral-reef specific lessons regarding reattachment of large sea fans, triaging and organizing large-scale volunteer marine debris recovery, and other coral ecosystem restoration efforts. We argue that “natural” disasters can cause significant damage to reefs and other ecosystems and that much damage results from human sources that are not natural and can be mitigated or prevented (such as siting and land-use decisions that lead to debris affecting reefs). Thus, we disagree with those who say natural events like hurricanes or tsunamis “are not appropriate for reef restoration” (Precht 2006; Symons et al. 2006). Further, governments need to recognize the economic and inherent values of ecosystem goods and services in natural disaster response legislation and policies (e.g., The Stafford Act in the United States) to improve outcomes for society. We also argue that ecosystem advocates need to adopt the language of emergency management.
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10

BRUHN, CARLOS H. L., ROGER G. WALKER, Jory A. Pacht, and Carlos H. L. Bruhn. "High-Resolution Stratigraphy and Reservoir Geometry of Turbidites from the Marine Transgressive Megasequence of Campos (Late Cretaceous) and Espírito Santo (Early Eocene) Basins, Brazil." In Submarine Fans and Turbidite Systems: Sequence Stratigraphy, Reservoir Architecture and Production Characteristics, Gulf of Mexico and International: 15th Annual, 35–36. SOCIETY OF ECONOMIC PALEONTOLOGISTS AND MINERALOGISTS, 1994. http://dx.doi.org/10.5724/gcs.94.15.0035.

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Тези доповідей конференцій з теми "Marine fans"

1

Hinsch, Ralph. "Indications of Deep Marine Fans in the Early Miocene Foredeep of Lower Austria: A Potential New Play." In Abu Dhabi International Petroleum Exhibition & Conference. SPE, 2021. http://dx.doi.org/10.2118/208133-ms.

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Abstract The petroleum province in Lower Austria resulted from the Alpine collision and the subsequent formation of the Vienna Basin. OMV is active in this area since its foundation in 1956. Several plays have been successfully tested and produced in this complex geological region. The main exploration focus is currently on the deep plays. However, this paper proposes a so far unrecognized and therefore undrilled play in a shallower level to broaden OMV's portfolio in Austria. Seismic re-interpretations of reprocessed 3D seismic data and structural reconstructions were used to review some of the existing plays and get novel ideas from improved understanding of processes. In the frontal accretion zone of the Alpine wedge, the Waschberg-Ždánice zone discoveries are limited to the frontal thrust unit and associated structures. The more internal parts of the thrust belt have only sparsely been drilled and are perceived not to have high-quality reservoir rocks. The detailed structural interpretations indicated that the foredeep axis during the Early Miocene was positioned in the thrust sheet located directly in front of the advancing Alpine wedge (comprising the eroding Rhenodanubian Flysch in its frontal part). Seismic amplitude anomalies can be interpreted to represent Lower Miocene basin floor and slope fans. Nearby wells did not penetrate these fans but drilled instead shale-dominated lithologies. Thus, the presence of potential sand-rich fans in front of the advancing alpine wedge is considered a potential new play in Lower Austria. Analogues are found in Upper Austria some 250 km to the West, where several large gas fields in Lower Miocene deposits located in front of the advancing Alpine wedge have been discovered by another operator. In that area the fans are only partly involved in the fold-thrust belt. In Lower Austria, these fans are located within the rear thrust sheet(s), providing a structural component to a mixed structural-stratigraphic trap. Two potential charge mechanism can be considered: a) biogenic gas charge from the organic matter of surrounding shales (like the Upper Austria analogues) or b) oil charge via the thrust fault planes from the Jurassic Mikulov Formation (the proven main source rock in the broader area). Our results add to the understanding of the Miocene structural-stratigraphic evolution of the Alpine collision zone. The definition of a potential new play may add significant value to OMV's upstream efforts in a very mature hydrocarbon province.
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2

Saha, U. K., and B. Roy. "On the Application of Variable Camber Blading in Axial Flow Fans and Compressors." In ASME 1996 Turbo Asia Conference. American Society of Mechanical Engineers, 1996. http://dx.doi.org/10.1115/96-ta-058.

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For land and marine based gas turbine engines, heavy duty industrial axial flow fans and compressors, variable camber tandem blading seems to be an attractive proposition in the pursuit of high pressure ratio machines under design and off-design power settings. In the present investigations, experiments have been carried out in a cascade wind tunnel to explore the variable camber capability of a tandem blade at two extreme camber settings. Aerodynamic performance studies have been made qualitatively on the basis of static pressure coefficient distribution, diffusion factor and mass averaged loss coefficient data. Experimental evidences demonstrate the possible operation of variable camber blading within a wide range of 20° camber variation.
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3

Murray, J., and G. Fudge. "Construction and Commissioning of the Offshore Engineering and Seakeeping Basin at the Institute for Marine Dynamics." In SNAME 22nd American Towing Tank Conference. SNAME, 1989. http://dx.doi.org/10.5957/attc-1989-021.

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The National Research Council of Canada is presently constructing and preparing to commission a 75 m x 32 m x 3.5 m Offshore Engineering and Seakeeping Basin at the Institute for Marine Dynamics in St. John's, Newfoundland. The Basin will be capable of simulating waves, wind and current, for use in both commercial and research programs. The first stage of commissioning and calibration will focus on preparing the Basin, scheduled for completion in February 1990, for commercial testing of moored and free running vessels. Waves are gene rated in the Basin by means of a 192 segment wave machine, mounted in a "J" configuration. Short and long-crested monochromatic and random waves will be generated using the snake principle. Passive wave absorption is utilized in the Basin using expanded metal sheets of varying porosities and spacings. These are located at all Basin wall locations not supporting wave generators. A bank of 24 analog controlled fans is used to generate wind. Turbulence spectra and velocity profiling are established by fluctuating the speed of the fans using precalibrated drive signals. Surface current is generated by setting up water circulation within the Basin. Submersible pumps are used to charge manifolds positioned at various levels below the surface. The data acquisition system, controlled by a microVAX-II computer, is capable of variable rate sampling of 128 channels of A/0 and can simultaneously output 16 channels of DIA. The microVAX is networked to a local VAX 3200 used for synthesis of drive signals and test data reduction and analysis. Model motions in six degrees-of-freedom are measured using an optical tracking system, consisting of three vertical and two horizontal cameras, and light emitting diodes positioned on the model.
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4

Nihei, Yasunori, Qiao Li, Takuji Nakashima, and Yoshiho Ikeda. "A Basic Study on Wind Pressure Characteristics of a Trimaran PCC." In ASME 2010 29th International Conference on Ocean, Offshore and Arctic Engineering. ASMEDC, 2010. http://dx.doi.org/10.1115/omae2010-20537.

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In recent years, the marine transport of a car is activated, and the demand for a pure car carrier (PCC) has grown quickly in the world wide. However, there are lots of technical issues of the present PCC, like lack of stability, effect of strong winds on its resistance, difficulty of course keeping in rough seas, difficulty of berthing in strong winds and so on. To overcome these technical issues, one of the authors has proposed a trimaran PCC which has very limited number of transverse bulkheads in the center hull by using two side hulls as fenders. In this study, wind forces and moments acting on a scale model of the trimaran PCC are measured in the towing tank with wind fans of Osaka Prefecture University. Furthermore, in order to find the parameters affecting on wind pressure, height and width of tunnels which are between a center hull and two side hulls are changed. To analyze it qualitatively, the flow field around the body is calculated by CFD. The wind pressure acting on the body is compared with that on a mono-hull PCC. Using these experimental and theoretical results, the wind pressure characteristics of a trimaran PCC are obtained.
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5

Shankaran, Gokul, and M. Baris Dogruoz. "Advances in Fan Modeling: Using Multiple Reference Frame (MRF) Approach on Blowers." In ASME 2011 Pacific Rim Technical Conference and Exhibition on Packaging and Integration of Electronic and Photonic Systems. ASMEDC, 2011. http://dx.doi.org/10.1115/ipack2011-52172.

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Forced convection air-cooled electronic systems utilize fans to sustain air flow through the enclosure. These fans are typically axial flow fans, radial impellers, and centrifugal blowers. When computing flow fields in electronic enclosures, axial fans have traditionally been abstracted as lumped fan models which may or may not be able to capture the necessary details. Under certain conditions, such lumped models may also capture some flow characteristics in the case of impellers and centrifugal blowers. These lumped models comprise a significantly simplified fan geometry, i.e. usually a planar (2-D) rectangular or circular surface with/without an inner (hub) concentric no-flow region for an axial fan or a rectangular prism/cylinder with a planar inlet for blowers/impellers, and a “pressure head-flow rate” (P-Q) curve, which may be supplied by the fan vendor or experimentally derived by the thermal designer. Irrespective of the source, the P-Q curve is obtained from laboratory experiments that conform to the test codes published by societies such as ASME and AMCA. Convenience and accuracy of lumped fan models are dependent on the specific application, cooling method and also the acceptable error margin. The acceptable error margin of the thermal design has shrunk significantly in the last decade. This has caused an interest in more accurate and robust fan modeling techniques such as Multiple Reference Frame (MRF) model which has already been commonly and successfully used in many different industries for a while. In this paper, an attempt was made to provide a validation of the MRF fan modeling applied to different types of fans. The computational fluid dynamics (CFD) model of an AMCA standard wind tunnel was used for each of the fans investigated. The P-Q curve obtained from the MRF model is benchmarked against the corresponding experimentally derived P-Q curve. Benefits and limitations of the MRF model are also discussed.
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6

Hurray, J. "Seakeeping Test on a Semisubmersible Moored in the Environments of Wind, Waves, and Currents." In SNAME 22nd American Towing Tank Conference. SNAME, 1989. http://dx.doi.org/10.5957/attc-1989-029.

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The Institute for Marine Dynamics has recently completed a test program on a moored offshore structure in the clear-water tow tank. The program is the first commercial project of this type completed at IMD and required development of techniques to model mooring systems and simulate wind and current. A 1:45 scale model of a moored, six-column, semisubmersible floating production system was tested in the simulated environment of waves, wind and current to deter-mine motions and mooring forces. The model was moored in the tow tank of dimensions 200 m x 12 m with a still water depth of 7 m. The full scale spread mooring consisting of twelve catenary lines was modelled using four thin cables attached to vertical springs supported at the tank walls. The model mooring system was designed to model horizontal stiffness only and hydrodynamic effects on the mooring lines were assumed to be negligible. Both regular and irregular waves were generated for the test program. The irregular spectra were analyzed to identify grouping patterns used to compute the slow drift forces on the vessel. Wind was simulated using a bank of twelve analog controlled fans. Two gusting spectra were simulated by fluctuating the fan speeds. Currents were produced in the tank using two rows of nozzles positioned one above the other below the still water surface. Two submersible pumps supported from the main carriage approximately 23 m from the nozzles were used to set up a surface current. The vessel was subjected to the three environments separately. The two irregular wave spectra were then run with wind and current included. Test results were compared to those predicted by a computer program based on the traditional 3-dimensional source distribution technique using an idealized wetted hull surface of 576 panels. A comparison between the measured and computed results was made with respect to first-order oscillatory motions, second-order drift displacements and mooring forces.
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7

Monir, Mostafa, and Omar Shenkar. "Pre-Messinian Petroleum Systems and Trap Style in the Offshore Western of Nile Delta; An Integrated Geological and Geophysical Approach." In SPE/AAPG Africa Energy and Technology Conference. SPE, 2016. http://dx.doi.org/10.2118/afrc-2552889-ms.

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ABSTRACT Exploration in the offshore Nile Delta province has revealed several hydrocarbon plays. Deep marine Turbidites is considered one of the most important plays for hydrocarbon exploration in the Nile Delta. These turbidites vary from submarine turbidite channels to submarine basin floor fans. An integrated exploration approach was applied for a selected area within West Delta Deep Marine (WDDM) Concession offshore western Nile Delta using a variety of geophysical, geological and geochemical data to assess the prospectivity of the Pre-Messinian sequences. This paper relies on the integration of several seismic data sets for a new detailed interpretation and characterization of the sub-Messinian structure and stratigraphy based on regional correlation of seismic markers and honoured the well data. The interpretation focused mainly on the Oligocene and Miocene mega-sequences. The seismic expression of stratigraphic sequences shows a variety of turbidite channel/canyon systems having examples from West Nile delta basin discoveries and failures. The approach is seismically based focusing on seismic stratigraphic analysis, combination of structure and stratigraphic traps and channels interpretation. Linking the geological and geophysical data together enabled the generation of different sets of geological models to reflect the spatial distribution of the reservoir units. The variety of tectonic styles and depositional patterns in the West Nile delta provide favourable trapping conditions for hydrocarbon generations and accumulations. The shallow oil and gas discoveries in the Pliocene sands and the high-grade oils in the Oligo-Miocene and Mesozoic reservoirs indicate the presence of multiple source rocks and an appropriate conditions for hydrocarbon accumulations in both biogenic and thermogenic petroleum systems. The presence of multi-overpressurized intervals in the Pliocene and Oligo-Miocene Nile delta stratigraphic column increase the depth oil window and the peak oil generation due to decrease of the effective stress. Fluids have the tendency to migrate from high pressure zones toward a lower pressure zones, either laterally or vertically. Also, hydrocarbons might migrate downward if there is a lower pressure in the deeper layers. Well data and the available geochemical database have been integrated with the interpreted seismic data to identify potential areas of future prospectivity in the study area.
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Chen, Xiangyi, Wuli Chu, Haoguang Zhang, Jinge Li, and Jinhua Lang. "Numerical Investigation of Effect of Recess Vane Casing Treatments on an Axial Lift Fan Performance." In ASME Turbo Expo 2017: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/gt2017-63767.

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Lift fans fitted on hovercraft are often subjected to pressure pulse generated by the sea waves. With a high pressure from the pressure pulse, the fan is driven transiently to a low mass flow rate operating point. The probability that a stall can happen is relatively high. The recess vane casing treatment (RVCT) is used to improve the axial lift fan’s stall margin in this paper. Using the NUMECA software, the fan with solid casing and different RVTC geometry and its flow field are analyzed. The geometry modifications include blade chord exposure variation and cavity outlet axial span. Compared with the solid case, all casing treatments result in a reduction in efficiency. The blade chord exposure is a key factor that affects the efficiency. The RVCT with minimum blade chord exposure provides an inferior stall margin of −0.293% while the others provide 6% to 15% stall margin improvement, respectively. In the study of the physical flow mechanisms, visualization can provide an insight into the flow field. This reveals that characteristics of the mainstream flow are different between near stall point and design point for the solid casing fan. The three-dimensional (3D) flow field suggests that the flow capacity near the blade tip is damaged by the blockage. The rotor blade is considered as a critical tip based on its stalling behavior. By applying RVCT, the flow field near blade tip is modified, and local mass flow ahead of blade leading edge increases while flow distribution of blade downstream along spanwise is almost the same with the solid casing fan. Also, the flow exchange between RVCT and mainstream is established through the introduction of RVCT. In quantitative analysis, the flow exchange is quantified based on the mass flow passing through the cavity. The ability of RVCT to stabilize the fan is based on the size of cavity, the more mass flow passes through cavity, the more stall margin enhancement can be obtained by the fan. However, the flow exchange between RVCT and mainstream can cause intense mixing, which can lead to efficiency loss.
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Dogruoz, M. Baris, and Gokul Shankaran. "Advances in Fan Modeling: Issues and Effects on Thermal Design of Electronics." In ASME 2012 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/imece2012-89857.

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Forced convection air-cooled electronic systems consist of fans to provide fluid flow through the enclosure. Typically axial flow fans, radial impellers, and centrifugal blowers fall into this category. In numerical computations of flow fields in electronic enclosures, axial fans have most commonly been abstracted as planar (2-D) rectangular or circular surfaces. In some cases, these abstract or lumped models may be used to mimic impellers and centrifugal blowers as well. All of these models rely on an experimentally derived “pressure head-flow rate” (P-Q) curve (also called “fan curve”). The experiments to obtain the fan curve should conform to the test codes published by ASME and/or AMCA. Convenience and accuracy of abstract fan models are dependent on the specific application/cooling method and the acceptable error margin. The latter for the thermal design of electronics has recently diminished considerably which led to the need of using more accurate and robust fan modeling techniques such as Multiple Reference Frame (MRF) model. The authors validated this method for different types of fans against relevant experimental data previously [1,2]. As a continuation of this earlier effort, an attempt is made to examine the thermal field computed by various fan modeling techniques including MRF for air-cooled enclosures in the present work. The results show that the temperature values obtained from lumped fan model and the MRF technique differ considerably.
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Roy, Bhaskar, K. Ravibabu, P. Srinivasa Rao, S. Basu, A. Raju, and P. N. Murthy. "Flow Studies in Ducted Twin-Rotor Contra-Rotating Axial Flow Fans." In ASME 1992 International Gas Turbine and Aeroengine Congress and Exposition. American Society of Mechanical Engineers, 1992. http://dx.doi.org/10.1115/92-gt-390.

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The design and testing of a 400 mm diameter contra-rotating fan unit was undertaken to study the flow behavior through the contra-rotating fans, and to find ways and means of improving their design and performance. The performance characteristics of the two-fan unit have shown that large overall stall margins can be achieved. Also, the effect of axial gaps showed that at the design speed combination best performance was observed at an axial gap of 50% of the 1st Fan chord. Studies on the 2nd fan exit flow field, performance characteristics of individual fans and casing boundary layer development have been made. Significant performance enhancement is observed with serration on 2nd fan rotor blade surface. When casing boundary layer suction is employed in between the two blades, the 2nd fan exit flow shows better uniformity and increased total pressure at all radii. However, to obtain a large operating range, careful optimization of the 2nd rotor blade design would be required, taking into account peculiarities shown by the present study in variation of deviation and exit flow angles of the individual fans, and casing boundary layer development with increased axial pressure gradient.
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Звіти організацій з теми "Marine fans"

1

Wurl, Oliver. Biofilm-like habitat at the sea-surface: A mesocosm study, Cruise No. POS537, 14.09.2019 – 04.10.2019, Malaga (Spain) – Cartagena (Spain) - BIOFILM. University of Oldenburg, November 2020. http://dx.doi.org/10.3289/cr_pos537.

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OceanRep OceanRep Startseite Kontakt Schnellsuche Einfache Suche Erweiterte Suche Blättern Autor Forschungsbereich Publikationsart Jahr Studiengang Neuzugänge Artikel – begutachtet Alle Über uns GEOMAR Bibliothek Open Access Policies Grundsätze Hilfe FAQs Statistik Impressum Biofilm-like habitat at the sea-surface: A mesocosm study, Cruise No. POS537, 14.09.2019 – 04.10.2019, Malaga (Spain) – Cartagena (Spain) - BIOFILM . Logged in as Heidi Düpow Einträge verwaltenManage recordsManage shelvesProfilGespeicherte SuchenBegutachtungAdminLogout - Tools Wurl, Oliver, Mustaffa, Nur Ili Hamizah, Robinson, Tiera-Brandy, Hoppe, Jennifer, Jaeger, Leonie, Striebel, Maren, Heinrichs, Anna-Lena, Hennings, Laura Margarethe, Goncalves, Rodrigo, Ruiz Gazulla, Carlota und Ferrera, Isabel (2020) Biofilm-like habitat at the sea-surface: A mesocosm study, Cruise No. POS537, 14.09.2019 – 04.10.2019, Malaga (Spain) – Cartagena (Spain) - BIOFILM . Open Access . POSEIDON Berichte . University of Oldenburg, Oldenburg, 35 pp. [img] Text Cruise_Reports_POS537_final.pdf - publizierte Version Available under License Creative Commons: Attribution 4.0. Download (2417Kb) | Vorschau Abstract Biofilm-like properties can form on sea surfaces, but an understanding of the underlying processes leading to the development of these biofilms is not available. We used approaches to study the development of biofilm-like properties at the sea surface, i.e. the number, abundance and diversity of bacterial communities and phytoplankton, the accumulation of gel-like particles and dissolved tracers. During the expedition POS537 we used newly developed and free drifting mesocosms and performed incubation experiments. With these approaches we aim to investigate the role of light and UV radiation as well as the microbes themselves, which lead to the formation of biofilms. With unique microbial interactions and photochemical reactions, sea surface biofilms could be biochemical reactors with significant implications for ocean and climate research, e.g. with respect to the marine carbon cycle, diversity of organisms and oceanatmosphere interactions.
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Laue, M. L. Economic Recovery of Oil Trapped at Fan Margins Using Hig Angle Wells Multiple Hydraulic Fractures. Office of Scientific and Technical Information (OSTI), November 1997. http://dx.doi.org/10.2172/328513.

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Mike L. Laue. Economic Recovery of Oil Trapped at Fan Margins Using High Angle Wells Multiple Hydraulic Fractures. Office of Scientific and Technical Information (OSTI), October 1997. http://dx.doi.org/10.2172/1562.

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4

Mike L. Laue. ECONOMIC RECOVERY OF OIL TRAPPED AT FAN MARGINS USING HIGH ANGLE WELLS AND MULTIPLE HYDRAULIC FRACTURES. Office of Scientific and Technical Information (OSTI), September 2001. http://dx.doi.org/10.2172/811814.

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Laue, M. L. Economic Recovery of Oil Trapped at Fan Margins Using High Angle Wells and Multiple Hydraulic fractures. Office of Scientific and Technical Information (OSTI), August 1997. http://dx.doi.org/10.2172/643508.

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6

Mike L. Laue. Economic Recovery of Oil Trapped at Fan Margins Using High Angle Wells and Multiple Hydraulic Fractures. Office of Scientific and Technical Information (OSTI), May 1997. http://dx.doi.org/10.2172/2206.

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Laue, M. L. Economic Recovery of Oil Trapped at Fan Margins Using High Angle Wells and Multiple Hydraulic Fractures. Office of Scientific and Technical Information (OSTI), November 1999. http://dx.doi.org/10.2172/14233.

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8

Mike L. Laue. Economic Recovery of Oil Trapped at Fan Margins Using High Angle Wells and Multiple Hydraulic Fractures. Office of Scientific and Technical Information (OSTI), May 1997. http://dx.doi.org/10.2172/1561.

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Mike L. Laue. Economic Recovery of Oil Trapped at Fan Margins Using High Angle Wells and Multiple Hydraulic Fractures. Office of Scientific and Technical Information (OSTI), February 1998. http://dx.doi.org/10.2172/1563.

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Mike L. Laue. Economic Recovery of Oil Trapped at Fan Margins Using High Angle Wells and Multiple Hydraulic Fractures. Office of Scientific and Technical Information (OSTI), May 1998. http://dx.doi.org/10.2172/1564.

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