Bibliografie tematiche / Seabed

Letteratura scientifica selezionata sul tema "Seabed"

Autore: Grafiati
Pubblicato: 4 giugno 2021
Ultima modifica: 10 marzo 2023

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Articoli di riviste sul tema "Seabed"

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Krutilla, Kerry, David Good, Michael Toman e Tijen Arin. "Addressing Fundamental Uncertainty in Benefit–Cost Analysis: The Case of Deep Seabed Mining". Journal of Benefit-Cost Analysis 12, n. 1 (2021): 122–51. http://dx.doi.org/10.1017/bca.2020.28.

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AbstractMineral deposits of base metals, precious metals, and rare earth elements have been discovered on deep seabeds, and the commercial exploitation of these resources seems poised to begin after faltering for many years. The development of seabed resources could be socially beneficial if all goes well, but the industry faces daunting challenges and uncertainties. Emerging regulations and contracting mechanisms are the principal means for managing these uncertainties. This article recommends a complementary approach: the use of ex ante benefit–cost analysis of proposed seabed mining contracts that incorporates a fundamental uncertainty evaluation. We argue that such an ex ante evaluation will improve the state of information for the decision-making, reducing the risk of regulatory noncompliance or costly contract disputes after seabed mining begins.
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Barnett, Anna. "Seabed seepage". Nature Climate Change 1, n. 909 (27 agosto 2009): 99. http://dx.doi.org/10.1038/climate.2009.81.

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Dyer, KR. "Seabed mechanics". Marine and Petroleum Geology 2, n. 4 (novembre 1985): 377. http://dx.doi.org/10.1016/0264-8172(85)90037-6.

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BROADUS, J. M. "Seabed Materials". Science 235, n. 4791 (20 febbraio 1987): 853–60. http://dx.doi.org/10.1126/science.235.4791.853.

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Lodge, Michael. "The International Seabed Authority and deep seabed mining". UN Chronicle 54, n. 2 (26 maggio 2017): 44–46. http://dx.doi.org/10.18356/ea0e574d-en.

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Yang, Wenxian, e Wenye Tian. "Concept Research of a Countermeasure Device for Preventing Scour around the Monopile Foundations of Offshore Wind Turbines". Energies 11, n. 10 (28 settembre 2018): 2593. http://dx.doi.org/10.3390/en11102593.

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Scouring has long been considered to be a major issue affecting the reliability of the monopile foundations of offshore wind turbines (OWTs) on sandy seabeds. To reduce the impact of scouring, several tons of rock/stone are usually placed around the foundations shortly after the installation of them. Such a measure is costly. Moreover, rock and stone may spread widely on the seabed during the long-term service period of OWTs. It has no doubt that recycling these rock and stone on the seabed is quite difficult in future decommission. For this reason, a new scour-countermeasure device (SEMCD) is proposed and studied in this paper. Considering that the major driver of scouring is horseshoe vortices around the monopile foundation, a hollow horn-like SEMCD with an arc surface profile is designed for weakening the horseshoe vortices. The SEMCD is made of either cement or other kinds of corrosion resistant materials. It is light in weight, and easy to install and decommission. In the paper, the working mechanism of the SEMCD is first explained. Then, its scouring mitigation effect (SME), i.e., its contribution to the reduction of horseshoe vortices and the mitigation of seabed erosion around the foundation, is studied through investigating its influences on down/up-flow and seabed shear stress. Finally, the optimal size of the SEMCD is discussed through investigating the impact of its size on the speeds of up and down flows and the shear stress on seabed surface. The calculation results have shown that the proposed SEMCD has great potential to prevent scouring and seabed erosion, so that it is of significance to improve the reliability of the monopile foundations of OWTs.
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Riddell-Dixon, E., e Roderick Ogley. "Internationalizing the Seabed". International Journal 40, n. 3 (1985): 548. http://dx.doi.org/10.2307/40202253.

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Lodge, Michael W. "International Seabed Authority". International Journal of Marine and Coastal Law 26, n. 3 (2011): 463–80. http://dx.doi.org/10.1163/157180811x576929.

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Jaeckel, Aline. "International Seabed Authority". International Journal of Marine and Coastal Law 31, n. 4 (22 novembre 2016): 706–19. http://dx.doi.org/10.1163/15718085-12341416.

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Pace, N. G., e H. Gao. "Swathe seabed classification". IEEE Journal of Oceanic Engineering 13, n. 2 (aprile 1988): 83–90. http://dx.doi.org/10.1109/48.559.

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Tesi sul tema "Seabed"

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Russell, Peter. "Stormcloud to seabed". Thesis, Heriot-Watt University, 1986. http://hdl.handle.net/10399/1074.

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Eiesland, Ole Wostryck. "Estimating seabed velocities from normal modes". Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for petroleumsteknologi og anvendt geofysikk, 2012. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-18514.

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In this Master Thesis a method for estimating seabed p-wave velocities from normal mode seismic data is developed. This is done through forward modeling using two dimensional finite difference modeling to generate synthetic data based on a given parallel two layered laterally varying seabed velocity model and a constant two layered density model, with a common fixed water depth. A semblance inversion technique is developed in MATLAB using the period equation eqref{eq:period} and the resulting velocity profiles is plotted against the exact velocity model to check the validity of the estimates. The same method is extended to estimations of seabed densities. For analysis of the robustness of the method, analysis with added pseudo random noise is preformed.The results shows a good performance of the semblance method to reproduce the model velocity parameters. The introduction of noise is handled well and decent results are obtained for significantly low signal to noise ratios.It suggests that the semblance method is applicable to use for determination of other parameters influencing the normal mode response signal.
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Caughey, David Arthur. "Seabed classification from acoustic echosounder returns". Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp02/NQ32738.pdf.

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Paskin, Sandra. "The self-burial of seabed pipelines". Thesis, University College London (University of London), 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.327090.

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Krotov, Mikhael. "Water waves over a muddy seabed". Thesis, Massachusetts Institute of Technology, 2008. http://hdl.handle.net/1721.1/45283.

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Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 2008.
Includes bibliographical references (p. 199-200).
A generalized viscoelastic model is used to describe the rheological properties of mud and is fitted to the available experimental data, so that its constitutive coefficients are just material properties independent of the frequency of the external forcing. We integrate this model into a perturbation analysis to solve the interaction between a thin layer of viscoelastic mud and sinusoidal waves propagating on top of a water layer of intermediate depth. In contrast with the previous studies the analysis is done for decaying water waves and a rheological model with frequency independent coefficients. The leading order motion and the mean second order motion inside the mud layer is determined analytically together with the first two orders motion in water. The analysis is done in a fixed Eulerian frame and it is shown that both a mean horizontal displacement and a Eulerian mean horizontal velocity exists inside the mud layer at the second order. The effect of elasticity and viscosity on the damping of water waves and on the mean motion of the mud is studied. It is shown that a light mud with a high proportion of elasticity will significantly modify the leading order movement through damping. The results are applied to solve analytically the problem of the evolution of the narrow-banded waves propagating on top of a semi-infinite mud layer. It is shown that the presence of the mud layer gives rise to a negative mean current in water layer and to free waves generated at the edge of the mud layer and propagating at the dimensional velocity ....
by Mikhael Krotov.
S.M.
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Cheuk, Chi Yin. "Soil-pipeline interaction at the seabed". Thesis, University of Cambridge, 2005. https://www.repository.cam.ac.uk/handle/1810/272147.

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Li, Zhengxu. "Seabed Instability around a Submerged Breakwater due to Dynamic Loadings". Thesis, Griffith University, 2019. http://hdl.handle.net/10072/387387.

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A breakwater is one of common offshore structures for protecting ports and coastlines. Dynamic response of a seabed around a breakwater caused by the interactions between waves and currents is a critical aspect in evaluating the stability of the breakwater foundation. The existence of breakwater does not only affect the propagation pattern of nearby waves but also has a particular influence on the stability of the surrounding seabed. Under the interaction of waves and currents, liquefaction of the seabed foundation is one of main causes of breakwater damage, which must be fully considered in the design and construction of breakwaters. The periodic motion of waves exerts a cyclical pressure on the interface between seawater and seabed. Due to the effect of the cyclic wave pressures, the wave-induced residual pore pressure will increase, and the effective stress will decrease in the seabed, which could cause soil displacements and seabed deformation. Thus, under certain conditions, the shear failure and liquefaction of the seabed will occur. Furthermore, under the action of cyclic wave pressure, the normal stress and shear stress of the soil element in the seabed are cyclically changed which will cause the principal stress axis continuously to rotate. As a consequence, the plastic deformation of the soil is more significant, and the seabed is more prone to liquefaction. In this study, a one-way coupled two-dimensional numerical model is established integrating the fluid model and the seabed model. The soil liquefaction caused by the excess pore water pressure in the seabed is calculated by using the elasto-plastic porous medium soil model. The feasibility of the model was verified by comparison with the laboratory experiments, the centrifuge tests, and the previous numerical model data. It is shown that the numerical model can simulate the dynamic response of the seabed under wave-current interaction with high accuracy. By adopting the integrated numerical model, the dynamic seabed response generated by the rotation of the principal stress (PSR) axis is analysed under the cyclic wave loading. It is found that the PSR will affect the seabed dynamic response significantly. The liquefaction depth of the case considered PSR is much deeper than the results which did not consider the PSR effects, since the plastic strain of the soil caused by the PSR is involved in. Secondly, the dynamic response of seabed under different uniform current velocity and different wave conditions are solved. It is found that the following current accelerates the accumulation of pore water pressure, increases the displacement of the soil, and makes the seabed easier to liquefy, while the opposing current has an opposite effect. Also, the dynamic response of the seabed under wave loading is calculated, and detailed parameter analysis of the liquefaction potential of the seabed are carried out, including wave parameters (wave height, wave period), and seabed parameters (soil permeability, degree of saturation). In order to figure out the influence of the breakwater, a new-developed coupled model is established to simulate wave-seabed-breakwater interactions under cyclic wave loading. Firstly, the consolidation of the seabed under the effect of the self-weight of the breakwater is calculated. The dynamic response of the seabed around the breakwater and the seabed liquefaction depth are computed after consolidation process. Secondly, the interaction between wave and submerged breakwater is studied by the coupled numerical model. The influence of the height and crest width of the breakwater on the wave propagation is analysed. The variations of wave height in front of and behind the breakwater are compared. At the same time, the influence of breakwater height and crest width on liquefaction depth and liquefaction potential of seabed under wave action is analysed.
Thesis (Masters)
Master of Philosophy (MPhil)
School of Eng & Built Env
Science, Environment, Engineering and Technology
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Jin, Xing. "Fatigue of Pipelines resting on Uneven Seabed". Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for marin teknikk, 2011. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-15794.

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Subsea pipelines represent the most cost effective way of transporting oil and gas from the subsea field to the market. A large network of subsea pipelines has therefore been installed both at the Norwegian continental shelf an elsewhere. In the near-shore areas of Norway, the seabed is irregular and pipeline free-spans are unavoidable. This in combination with significant current action, may cause vortex induced vibration (VIV) and fatigue in the pipeline welds. This project focus on studying the fatigue performance of free-spanning pipelines using a combination of FEM analysis and the DnV recommended practices.
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Roos, Pieter Cornelis. "Seabed pattern dynamics and offshore sand extraction". Enschede : University of Twente [Host], 2004. http://doc.utwente.nl/50843.

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Izedonmwen, Osaretin Ernest. "The environmental impact of deep seabed mining /". Thesis, McGill University, 1989. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=59416.

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The deep seabed until the late sixties was a largely unknown part of the sea and represented nothing more than an academic curiosity. With technology making hitherto hidden depths of the ocean accessible for exploitation, it became known in the late sixties that the deep seabed contained precious minerals. In a world used to shrinking resources, this shot the deep seabed into the centre stage of world politics, becoming perhaps the most controversial issue in any United Nations Conference. The controversy centered around the legal status of the deep seabed. This work contends that there is not in place any viable international legal regime for supervising and regulating resource development in the deep seabed outside national jurisdiction; that whatever regulations there are, are geared towards facilitating exploitation of the area; that such lacunae would be at an environmental cost that could negate whatever short-term benefits are derivable therefrom.
This work therefore examines the potential environmental impact of deep seabed mining and proposes a legal regime for preventing and minimizing same.
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Libri sul tema "Seabed"

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Denness, Bruce, a cura di. Seabed Mechanics. Dordrecht: Springer Netherlands, 1985. http://dx.doi.org/10.1007/978-94-009-4958-4.

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Woodward, John. On the seabed. Redding, Conn: Brown Bear Books, 2010.

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Woodward, John. On the seabed. Redding, Conn: Brown Bear Books, 2010.

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Sainson, Stéphane. Electromagnetic Seabed Logging. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-45355-2.

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Woodward, John. On the seabed. Redding, Conn: Brown Bear Books, 2010.

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On the seabed. London: Franklin Watts, 2009.

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Birdsong on the seabed. Tarset, Northumberland: Bloodaxe, 2008.

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Rawlinson, Jonathan. From space to the seabed. Vero Beach, Fla: Rourke Enterprises, 1988.

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Cleave, Peter. Takutai: The foreshore and seabed. Palmerston North [N.Z.]: Campus Press, 2010.

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Committee, Joint Nautical Archaeology Policy. Code of practice for seabed developers. Swindon: National Monuments Record (Maritime) Royal Commission on the Historical Monuments of England, 1995.

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Capitoli di libri sul tema "Seabed"

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Rozemeijer, Marcel J. C., Sander W. K. van den Burg, Robbert Jak, Laura E. Lallier e Karel van Craenenbroeck. "Seabed Mining". In Building Industries at Sea - ‘Blue Growth’ and the New Maritime Economy, 73–135. New York: River Publishers, 2022. http://dx.doi.org/10.1201/9781003337430-5.

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Peukert, Anne, Sven Petersen, Jens Greinert e François Charlot. "Seabed Mining". In Submarine Geomorphology, 481–502. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-57852-1_24.

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Dorschel, B., A. J. Wheeler, X. Monteys e K. Verbruggen. "The Irish Seabed". In Atlas of the Deep-Water Seabed, 21–24. Dordrecht: Springer Netherlands, 2010. http://dx.doi.org/10.1007/978-90-481-9376-1_3.

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Thorne, P. D. "Seabed Saltation Noise". In Natural Physical Sources of Underwater Sound, 721–44. Dordrecht: Springer Netherlands, 1993. http://dx.doi.org/10.1007/978-94-011-1626-8_54.

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Wood, J. S. "Seabed Contact Vehicles". In Advances in Underwater Technology, Ocean Science and Offshore Engineering, 309–17. Dordrecht: Springer Netherlands, 1988. http://dx.doi.org/10.1007/978-94-009-1299-1_32.

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Craig, W. H., M. Cruickshank e R. Fisher. "Seabed breakout forces". In Physical Modelling in Geotechnics, 283–87. London: Routledge, 2022. http://dx.doi.org/10.1201/9780203743362-51.

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van Tatenhove, Jan P. M. "Deep Seabed Mining". In Liquid Institutionalization at Sea, 61–81. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-031-09771-3_4.

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Guigné, Jacques Yves, e Philippe Blondel. "Acoustic Seabed Interrogation". In SpringerBriefs in Oceanography, 65–92. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-02579-7_4.

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Scott, Gill, Xavier Monteys, David Hardy, Charise McKeon e Thomas Furey. "Mapping the Seabed". In GEOINFORMATICS for Marine and Coastal Management, 17–42. Taylor & Francis Group, 6000 Broken Sound Parkway NW, Suite 300, Boca Raton, FL 33487-2742: CRC Press, 2016. http://dx.doi.org/10.1201/9781315181523-3.

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Verlaan, Philomene. "Deep-Seabed Mining". In Handbook on Marine Environment Protection, 843–54. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-60156-4_44.

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Atti di convegni sul tema "Seabed"

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Tianyun Su, Zhihan Lv, Shan Gao, Xiaolong Li e Haibin Lv. "3D seabed: 3D modeling and visualization platform for the seabed". In 2014 IEEE International Conference on Multimedia and Expo Workshops (ICMEW). IEEE, 2014. http://dx.doi.org/10.1109/icmew.2014.6890585.

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Griffiths, Terry, Scott Draper, Liang Cheng, Feifei Tong, Antonino Fogliani, David White, Fraser Johnson, Daniel Coles, Stephen Ingham e Caroline Lourie. "Subsea Cable Stability on Rocky Seabeds: Comparison of Field Observations Against Conventional and Novel Design Methods". In ASME 2018 37th International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/omae2018-77130.

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As offshore renewable energy projects progress from concept demonstration to commercial-scale developments there is a need for improved approaches beyond conventional cable engineering design methods that have evolved from larger diameter pipelines for the oil and gas industry. New approaches are needed to capture the relevant physics for small diameter cables on rocky seabeds to reduce the costs and risks of power transmission and increase operational reliability. This paper reports on subsea cables that MeyGen installed for Phase 1a of the Pentland Firth Inner Sound tidal stream energy project. These cables are located on rocky seabeds in an area where severe metocean conditions occur. ROV field observation of these cables shows them to be stable on the seabed with little or no movement occurring over almost all of the cable routes, despite conventional engineering methods predicting significant dynamic movement. We cite recent research undertaken by the University of Western Australia (UWA) to more accurately assess the hydrodynamic forces and geotechnical interaction of cables on rocky seabeds. We quantify the conformity between the cables and the undulating rocky seabed, and the distributions of cable-seabed contact and spanning via simulations of the centimetric-scale seabed bathymetry. This analysis leads to calculated profiles of lift, drag and seabed friction along the cable, which show that all of these load and reaction components are modelled in an over-conservative way by conventional pipeline engineering techniques. Overall, our analysis highlights that current cable stability design can be unnecessarily conservative on rocky seabeds. Our work foreshadows a new design approach that offers more efficient cable design to reduce project capex and enhance through-life integrity management.
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Gourvenec, Susan, e David White. "Consolidation Around Seabed Pipelines". In Offshore Technology Conference. Offshore Technology Conference, 2010. http://dx.doi.org/10.4043/20554-ms.

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Monteys, X., e D. Inamdar. "Multibeam Backscatter Seabed Classification". In 4th Congress of the Balkan Geophysical Society. European Association of Geoscientists & Engineers, 2005. http://dx.doi.org/10.3997/2214-4609-pdb.26.o12-05.

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Appleford, David E., e Ronald G. Smith. "Seabed Processing - Enabling Technology". In Offshore Technology Conference. Offshore Technology Conference, 2001. http://dx.doi.org/10.4043/13194-ms.

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Hossain, Mohammad Kabir, Ko-Min Tjok e Arash Nobahar. "Seabed Umbilical Stability Analysis". In Offshore Technology Conference. Offshore Technology Conference, 2008. http://dx.doi.org/10.4043/19438-ms.

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Meunier, J., D. Sangouard e B. Lhuillier. "A New Seabed Penetrometer". In Offshore Technology Conference. Offshore Technology Conference, 2000. http://dx.doi.org/10.4043/12095-ms.

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MacDonald, Alastair. "Autonomous Seabed Data Acquisition". In SPE Offshore Europe Oil and Gas Exhibition and Conference. Society of Petroleum Engineers, 2001. http://dx.doi.org/10.2118/71802-ms.

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Meunier, J., N. Sultan, P. Jegou e F. Harmegnies. "The Penfeld seabed penetrometer". In Oceans 2005 - Europe. IEEE, 2005. http://dx.doi.org/10.1109/oceanse.2005.1513249.

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Wang, Kunpeng, e Ying Min Low. "Study of Seabed Trench Induced by Steel Catenary Riser and Seabed Interaction". In ASME 2016 35th International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/omae2016-54236.

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Abstract (sommario):
Seabed trench profile has significant effect on the fatigue damage of steel catenary riser near touchdown point. This study briefly demonstrates an approach in literature to determine the seabed trench induced by wave frequency response based on the cubic polynomial model. In this approach, a criterion for the matching between catenary riser and seabed trench is proposed, which is an optimization problem, and needs iterative static analysis of catenary riser. Based on the criterion, the sensitivity of the trench length and position to three parameters is parametrically studied: riser mass per unit length, ratio of horizontal span to vertical span of catenary part, trench depth. The obtained data are employed to fit the equations of trench length and position, which is taken as surrogate model since the iterative static analysis is very complicated. For completeness, the validation against data obtained from hysteretic seabed model is also illustrated. Based on the surrogate model, this study investigates the effect of trench depth on the fatigue damage near touchdown and the effect of the low frequency response on the seabed trench, and some useful conclusions are obtained.
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Rapporti di organizzazioni sul tema "Seabed"

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Knobles, David. Seabed Acoustic Characterization. Fort Belvoir, VA: Defense Technical Information Center, settembre 2006. http://dx.doi.org/10.21236/ada612089.

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Garcia, Marcelo H. Turbidity Currents and Seabed Morphology. Fort Belvoir, VA: Defense Technical Information Center, settembre 2004. http://dx.doi.org/10.21236/ada613084.

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Singh, Pradeep. Deep impact: ocean seabed mining. Monash University, febbraio 2022. http://dx.doi.org/10.54377/ed5a-5a0e.

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Nogami, Toyoaki, Ganeswara R. Dasari e Pengzhi Lin. Wave-induced Mine Burial into Seabed; Part 1: Cohesionless Seabed in Cyclic Liquefaction State. Fort Belvoir, VA: Defense Technical Information Center, agosto 2001. http://dx.doi.org/10.21236/ada625902.

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Kaskela, A. M., e A. T. Kotilainen. Seabed geodiversity of the Baltic Sea. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 2017. http://dx.doi.org/10.4095/305871.

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Gross, G. A., e C. R. Mcleod. Metallic minerals on the deep seabed. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 1987. http://dx.doi.org/10.4095/125155.

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7

Hickerson, J. FREEFALL: A seabed penetrator flight code. Office of Scientific and Technical Information (OSTI), gennaio 1988. http://dx.doi.org/10.2172/5137580.

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8

Hanes, Daniel M. Granular-Fluid Interactions Near the Seabed. Fort Belvoir, VA: Defense Technical Information Center, settembre 1997. http://dx.doi.org/10.21236/ada628316.

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9

Holland, Charles W. GeoClutter Seabed Reflection and Scattering Measurements. Fort Belvoir, VA: Defense Technical Information Center, settembre 2003. http://dx.doi.org/10.21236/ada628597.

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10

Hanes, Daniel M. Granular-Fluid Interactions Near the Seabed. Fort Belvoir, VA: Defense Technical Information Center, settembre 1999. http://dx.doi.org/10.21236/ada629877.

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