Relevant bibliographies by topics / Offshore gravity structures

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  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
  6. Reports

Academic literature on the topic 'Offshore gravity structures'

Author: Grafiati
Published: 3 June 2025
Last updated: 13 July 2025

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Journal articles on the topic "Offshore gravity structures"

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Magray, Adil Ahmad, Amanpreet Tangri, Zehra Khan, and Naiyara Khan. "Foundation engineering for offshore gravity structures." IOP Conference Series: Earth and Environmental Science 889, no. 1 (2021): 012053. http://dx.doi.org/10.1088/1755-1315/889/1/012053.

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Abstract Gravity based structures are in play from early times. Numerous structures are being installed around the globe. These structures had shown a rigid face towards the harsh conditions/situation in the offshore environment. The key factors for sustainability are geotechnical design and the sub soil survey. These structures are used for collection, transport and also for temporary storage of crude gas and oil. These structures serve as a bridge between the much need fuel and the modern world. The installation of GBS involves major wings of modern engineering i.e. Mechanical, Structural, architecture and Geotechnical engineering because these structures are a great challenge as considering the harsh and hard off shore conditions. These structures are having a much importance apart from its features i.e. from the point of economy, as the oil prices are touching the heights, it influences construction of GBS. Now a days most of the multinational companies are focusing towards the construction of offshore GBS, as well as paying much attention on research work off these structures because to make huge profit. In this paper an effort has been made to understand the different aspects which are related to GBS i.e. pre-construction operations, soil investigation, construction, installment and some of the safety aspects as considering it one of the most focused topics now and in future.
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Wilms, Mayumi, Arne Stahlmann, and Torsten Schlurmann. "INVESTIGATIONS ON SCOUR DEVELOPMENT AROUND A GRAVITY FOUNDATION FOR OFFSHORE WIND TURBINES." Coastal Engineering Proceedings 1, no. 33 (2012): 35. http://dx.doi.org/10.9753/icce.v33.structures.35.

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Due to insufficient insights about the scour development around the STRABAG gravity foundation, the Franzius-Institute conducted small- and large-scale physical model tests in wave flumes on a scale of 1:50 and 1:17 in order to investigate the wave-induced scouring phenomena around the foundation and to design a scour protection system. The tests on scour development without a scour protection system show that the main areas which are vulnerable to scour are the contact areas of the foundation. Furthermore, the experiments show that a scour protection system is necessary for the given and investigated wave boundary conditions; the performance of the selected protection system using geotextile sand containers is verified. Additional numerical simulations indicate an amplification of the resulting flow around the foundation under combined loads (waves and current), but without significant change of the flow pattern
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Ghasempour, Roghayeh, V. S. Özgür Kirca, and B. Mutlu Sumer. "SCOUR AROUND AND SINKING OF SUBSEA STRUCTURES EXPOSED TO CURRENT AND WAVES." Coastal Engineering Proceedings, no. 38 (May 29, 2025): 127. https://doi.org/10.9753/icce.v38.structures.127.

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Many different subsea structures are used in the offshore industry, particularly for floating offshore wind farms, such as gravity anchors, tensioners, clump weights, and chains. Exposure of a subsea structure to currents and/or waves leads to changes in flow around the structure, forming flow contraction at the sides of the structure and secondary flow patterns such as horseshoe vortices, lee-wake vortices, and counter-rotating vortices (Sumer and Fredsøe, 2002). Often placed on erodible beds under current and/or wave action, scouring around these structures are experienced. The present paper presents the early results of an experimental study aiming to investigate the aforementioned scour and sinking processes around cuboid blocks (cubes, rectangular prisms and horizontal cylinders) under the action of waves, currents, and waves combined with currents.
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Wu, Tien H., Oddvar Kjekstad, In-Mo Lee, and Suzanne Lacasse. "Reliability analysis of foundation stability for gravity platforms in the North Sea." Canadian Geotechnical Journal 26, no. 3 (1989): 359–68. http://dx.doi.org/10.1139/t89-050.

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The uncertainties encountered in the evaluation of foundation stability for four offshore gravity structures in the North Sea are reviewed. The uncertainties include those about the load, the material type, the material strength, and the analytical method. The means and coefficients of variations of these are used as inputs to compute the mean and coefficient of variation of the safety factor and the reliability index. The latter are used to assess the effect of various options in site exploration and strength measurement on foundation reliability. Key words: foundation, gravity platforms, offshore structures, probability, reliability, shear strength, site investigation, stability.
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Ahmad, Omar. "An overview of design, construction and installation of gravity offshore platforms." International Journal of Advanced Engineering, Sciences and Applications 3, no. 1 (2022): 27–32. http://dx.doi.org/10.47346/ijaesa.v3i1.81.

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The offshore structures are used worldwide in different ways and for different purposes in a variety of weather conditions and water depths. The main aim of these structures is to explore and extract the gas and oil and it should works safely for approximately 25 years or more against some conditions. These structures plays a vital role on developing the economic level of the country and it is essential to be accurate in all of their planning, designing, manufacturing, transporting, and installing processes. There are many types these platforms which differ according to their function and the needed water depth. Gravity platform or condeep platform is one of these platforms which is fixed offshore platform, made by concrete. The purpose of this paper is to give some information overview about advantages, disadvantages, materials used, design, construction, transportation and installation of gravity platforms.
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Ombati, Dennis, John Githiri, Maurice K'Orowe, and Erick Nyakundi. "Delineation of Subsurface Structures Using Gravity Data of the Shallow Offshore, Lamu Basin, Kenya." International Journal of Geophysics 2022 (January 27, 2022): 1–12. http://dx.doi.org/10.1155/2022/3024977.

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Lamu Basin is located in South Eastern Kenya and covers about 170 000 km2 both onshore and offshore. Kenya’s Lamu Basin is hitherto underexplored even though there have been notable oil and gas discoveries along the margin of East Africa. This study focuses on the shallow section of the Lamu offshore bounded by 39°E to 43°E by 2°S to 6°S, whereby, unfortunately, some of the wildcat wells turned out to be dry although expensive. Gravity interpretation techniques such as spectral analysis and first horizontal derivative were applied to the reduced gravity data to delineate and model structures to minimize the high investment risks. The gravity data used in this study were sourced from the International Gravity Bureau (BGI) and National Oil Corporation of Kenya (NOCK) digital data courtesy of companies like Woodside Energy, Anadarko Kenya Limited, and Total Exploration and Production companies. The obtained reduced gravity data were gridded to produce the gravity anomaly grids (Free air, Bouguer, and Isostacy), which were consequently drawn into maps. From spectral analysis, depths to shallow sources and deep sources were estimated. These depths were used to set regional and residual separation filters using the Gaussian filter. The first horizontal derivative (FHD) applied to the regional Isostatic gravity anomaly map yielded features that were inferred as intrasediment fractures/faults trending in NW-SE and NE-SW directions. The features like the ridges, troughs, and faults mainly trending in the NW-SE direction are discernable from the regional anomaly map. The developed models show the basement highs and lows with a possibility of anticlinal and synclinal structures and thick sedimentary successions likely to represent good hydrocarbon source kitchens.
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Adakole Okpe, Samuel, and Joseph Ejelikwu Edeh. "Analysis, design and construction of gravity offshore structure; state-of-the-art." International Journal of Advanced Engineering, Sciences and Applications 3, no. 1 (2022): 12–17. http://dx.doi.org/10.47346/ijaesa.v3i1.74.

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Abstract: Offshore platforms are divided into many types which are mainly categorized according to waterdepth in the installation location. However, the design differs for each type to accomplish the target of the operation. But for some case of sea waterdepths and an aggressive environment such as the North Sea, steel ones are not suitable, so the heaviest type called gravity platform having enormous mass is used. This type of platform has its special requirements and procedures for construction and needs special types of construction materials in order to resist the climate factors applied due to the aggressive environment. The paper carefully illustrates how the principal Environmental loads (wind and wave), current forces, loads from ice and loads from earth-quake for (earth-quake prone zones) are deployed to archive the design and construction of offshore concrete gravity platforms. Two design methods (Analysis and Design of Shell structures) and the Tangent Modulus Methods of design of Offshore Concrete Gravity platforms are discussed
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Lv, Yi, Feng Yan Yang, Ming Wang Yang, Chen Gong, Jin Hua Liu, and Feng Jian Li. "Technical Study on Four-Crane Joint Lifting of Large-Sized Structures." Advanced Materials Research 945-949 (June 2014): 335–38. http://dx.doi.org/10.4028/www.scientific.net/amr.945-949.335.

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In recent years, due to rapid development of offshore engineering construction, offshore structure size and weight becomes larger and larger. In the process of offshore structures fabrication, the size and weight of the sub-structure is also becoming bigger, lifting method using single or two sets of cranes cannot meet the capacity requirement of the lifting operation, joint operation using four cranes is required in such cases. To solve this problem, this paper analyze the riskfactors(the uncertainty of the hook load, the inaccuracy of the center-of-gravity, limited working condition ) in the process of joint liftingusingfour crane.The paper also discusses the whole lifting process and simulates the process by usinganalysissoftware SACS, and the calculation result matches actual work very well.
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Esteban, M., José-Santos López-Gutiérrez, and Vicente Negro. "Gravity-Based Foundations in the Offshore Wind Sector." Journal of Marine Science and Engineering 7, no. 3 (2019): 64. http://dx.doi.org/10.3390/jmse7030064.

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In recent years, the offshore wind industry has seen an important boost that is expected to continue in the coming years. In order for the offshore wind industry to achieve adequate development, it is essential to solve some existing uncertainties, some of which relate to foundations. These foundations are important for this type of project. As foundations represent approximately 35% of the total cost of an offshore wind project, it is essential that they receive special attention. There are different types of foundations that are used in the offshore wind industry. The most common types are steel monopiles, gravity-based structures (GBS), tripods, and jackets. However, there are some other types, such as suction caissons, tripiles, etc. For high water depths, the alternative to the previously mentioned foundations is the use of floating supports. Some offshore wind installations currently in operation have GBS-type foundations (also known as GBF: Gravity-based foundation). Although this typology has not been widely used until now, there is research that has highlighted its advantages over other types of foundation for both small and large water depth sites. There are no doubts over the importance of GBS. In fact, the offshore wind industry is trying to introduce improvements so as to turn GBF into a competitive foundation alternative, suitable for the widest ranges of water depth. The present article deals with GBS foundations. The article begins with the current state of the field, including not only the concepts of GBS constructed so far, but also other concepts that are in a less mature state of development. Furthermore, we also present a classification of this type of structure based on the GBS of offshore wind facilities that are currently in operation, as well as some reflections on future GBS alternatives.
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Ali, Mohammed Y., Anthony B. Watts, and Asam Farid. "Gravity anomalies of the United Arab Emirates: Implications for basement structures and infra-Cambrian salt distribution." GeoArabia 19, no. 1 (2014): 143–58. http://dx.doi.org/10.2113/geoarabia1901143.

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ABSTRACT Gravity measurements onshore and offshore of the United Arab Emirates (UAE) have been used to construct a new Bouguer gravity anomaly map of the region. The gravity data, which has been gridded at 2,700 m × 2,700 m interval, has been used to constrain the tectonic elements, major lineation trends and structures of the Neoproterozoic basement of the Arabian Plate and the distribution of infra-Cambrian salt basins. Advanced transformation techniques (including first vertical derivative, total horizontal derivative, tilt derivative and Euler deconvolution) were applied to identify gravity source edges as an aid to structural interpretation and geological modelling of the study area. Three major structural provinces (fold-and-thrust belt, foreland and salt tectonic provinces) were identified based on the residual Bouguer gravity anomaly field. The eastern fold-and-thrust belt province is associated with short-wavelength positive gravity anomalies, which are attributed to the allochthonous series of the Semail Ophiolite and its related thrust sheets. The central foreland basin province is characterised by NNW-oriented negative gravity anomalies associated with deepening of the basement and thickening of Aruma and Pabdeh sediments in the foredeep basins and flexure of the top and base of the crust by the load of the Semail Ophiolite. The western salt tectonic province displays well-defined local gravity lows superimposed on a regional gravity high, which probably reflects the swelling of infra-Cambrian salt above a shallowing of the basement and thinning of the foredeep sediments. In addition, gravity modelling constrained by seismic and well data indicates the presence of substantial infra-Cambrian salt bodies in all basins of the UAE both onshore and offshore including the southern area of the Rub’ Al-Khali Basin. An extensive array of previously unmapped N-S, NW- and SW-trending lineaments affecting the basement and possibly overlying sediments are mapped in the UAE. The N-S Arabian trending lineament represents the effect of a major structure, along which many important oilfields are located (e.g. Bu Hasa). The SW trend has regular spacing and is dominant in the southern and central part of Abu Dhabi, east of the Falaha syncline. The NW-SE lineament is the most striking and includes two well-defined trends that cross Abu Dhabi Emirate, which in this paper are named as the Abu Dhabi Lineaments. These lineaments are associated with a linear gravity high extending from the southwestern border with Oman to the offshore close to Zakum oilfield. They are probably related to the Najd Fault System.
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Dissertations / Theses on the topic "Offshore gravity structures"

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Ercolanelli, Julien. "Étude numérique et expérimentale d'un système couplé stabilisateur et récupérateur d'énergie des vagues Experimental and numerical investigation of sloshing in anti-roll tank using effective gravity angle Experimental and numerical assessment of the performance of a new type passive anti-roll stabilisation system." Thesis, Brest, École nationale supérieure de techniques avancées Bretagne, 2019. http://www.theses.fr/2019ENTA0008.

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Le développement de Geps Techno est basé sur un concept innovant de structure flottante destinée à produire de l'énergie électrique à partir de plusieurs sources d'énergies marines renouvelables dont la source houlomotrice. Le système houlomoteur développé par Geps Techno repose sur la mise en circulation d'eau et la création d'un tourbillon en son sein. En profitant du phénomène de carène liquide, le concept est également déclinable en un système de stabilisation de navire ou de toute autre plateforme flottante. L'objectif à court terme de la société est le développement de cette technologie permettant la stabilisation et la récupération de l'énergie des vagues et pour lequel il reste des verrous technologiques à lever afin d'arriver à la viabilité et la rentabilité du système. Pour cela, Geps Techno a lancé en octobre 2015 le projet IHES (Integrated Harvesting Energy System) qui consiste à construire un démonstrateur de son concept de plateforme houlomotrice. Le projet IHES est un des projets de la feuille de route du plan "Navires écologiques" de la Nouvelle France Industrielle. Il est soutenu par Bpifrance dans le cadre du programme d'Investissements d'Avenir - Projets Industriels d'Avenir. Afin de maîtriser les objectifs de stabilisation et de récupération d'énergie, Geps Techno étudie les volets technologiques nécessaires permettant de passer de l'énergie disponible au niveau des vagues jusqu'à celle disponible au niveau de la turbine du houlomoteur. Les travaux de thèse soutenus par Fourestier en mai 2017 portaient sur un premier volet "Définition et contrôle des écoulements internes au système houlomoteur". A l'aide d'une modélisation des fluides numériques, ces derniers ont abouti à des modèles opérationnels caractérisant les écoulements internes. La présente thèse Cifre s'inscrit dans la continuité des travaux de Fourestier et traite d'un second volet "Modélisation du système couplé plateforme / houlomoteur". L'ensemble de ces travaux devra aboutir à un code de calcul opérationnel et corrélé à des résultats expérimentaux permettant d'étudier l'écoulement interne et le comportement du flotteur soumis à la houle<br>Geps Techno's development is based on an innovative concept of a floating structure intended to produce electrical energy from several renewable marine energy sources, including wave power. The wave power system developed by Geps Techno is based on circulating water and creating a vortex within it. By taking advantage of the liquid hull phenomenon, the concept can also be used as a stabilization system for a ship or any other floating platform. The short-term objective of the company is the development of this technology allowing the stabilization and recovery of wave energy and for which there remain technological obstacles to be removed in order to achieve the viability and profitability of the system. To do this, in October 2015 Geps Techno launched the IHES (Integrated Harvesting Energy System) project, which consists of building a demonstrator of its wave power platform concept. The IHES project is one of the projects of the roadmap of the "Ecological ships" plan of New Industrial France. It is supported by Bpifrance within the framework of the Investments for the Future - Industrial Projects for the Future program. In order to master the objectives of stabilization and energy recovery, Geps Techno is studying the technological aspects necessary to switch from the energy available at wave level to that available at the wave turbine turbine. The Ph.D. thesis work supported by Fourestier in May 2017 focused on a first part "Definition and control of internal flows in the wave power system". Using CFD modeling, the latter resulted in operational models characterizing internal flows. This Cifre Ph.D. thesis follows on from Fourestier's work and deals with a second part "Modeling of the coupled platform / wave power system". All of this work should lead to an operational computer code correlated with experimental results making it possible to study the internal flow and the behavior of the float subjected to swell
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Cindi, Brian Msizi. "3-D Seismic structural interpretation : insights to thrust faulting and paleo-stress field distribution in the deep offshore Orange Basin, South Africa." University of the Western Cape, 2016. http://hdl.handle.net/11394/5548.

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>Magister Scientiae - MSc<br>The Orange Basin provides exceptional 3-D structures of folds and faults generated during soft-sediment slumping and deformation which is progressive in nature. 3-D seismic and structural evaluation techniques have been used to understand the geometric architecture of the gravity collapse structures. The location of the seismic surveyed area is approximately 370 km northwest of the Port of Saldanha. The interpretation of gravitational tectonics indicate significant amount of deformation that is not accounted for in the imaged thrust belt structure. The Study area covers 8200 square kilometre (km²) of the total 130 000 km² area of the Orange Basin offshore South Africa. The south parts of the Study area are largely featureless towards the shelf area. The north has chaotic seismic facies as the result of an increase in thrust faults in seismic facies 2. Episodic gravitational collapse system of the Orange Basin margin characterizes the late Cretaceous post-rift evolution. This Study area shows that implications of stress field and thrust faulting to the thickness change by gravity collapse systems are not only the result of geological processes such as rapid sedimentation, margin uplift and subsidence, but also could have occurred as the result of the possible meteorite impact. These processes caused gravitational potential energy contrast and created gravity collapse features that are observed between 3000-4500ms TWT intervals in the seismic data.<br>Shell Exploration & Production Company
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Marsh, Nicola A. "The influences of crustal extension, salt tectonics and gravity-driven deformation on the structural evolution of the Halten Terrace, offshore mid-Norway : new sights from 3D seismic data and fault analysis." Thesis, Durham University, 2008. http://etheses.dur.ac.uk/1933/.

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Normal fault zones play a fundamental role in the development of sedimentary basins and in the migration and trapping of hydrocarbons. The idealised geometry of an isolated post-sedimentary normal fault (Barnett, 1987, Walsh & Watterson, 1989) existing conceptual models that describe the process of fault growth and linkage in brittle systems (Childs et al, 1995; Cartwright et al, 1996; Childs et al, 1995, 1996b; Huggins et al, 1995), where fault planes composed of many overstepping segments are linked by areas of complex deformation called relay ramps, are generally accepted. Relay zones can trap significant volumes of hydrocarbon or act as leakage points, thus understanding the style of fault linkage, which strongly influences the location of hydrocarbon tops and reservoir compartmentalisation, is vital for any petroleum system.
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Gaillard, Pierre. "Calcul numérique des ondes de gravité dans les zones littorales et les aménagements portuaires : [thèse soutenue sur un ensemble de travaux]." Grenoble 1, 1988. http://www.theses.fr/1988GRE10079.

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Methodes de calcul sur ordinateur concernant la propagation de la houle, tenant compte des effets combines de refraction due aux fonds, de diffraction et reflexion dus aux ouvrages maritimes. Problemes de houles periodiques et irregulieres, et de houles regulieres (variation du niveau moyen de la mer et des courants), ainsi que de diffraction des ondes longues par des ouvrages offshore. Cas des seiches dans les ports et de houle irreguliere en canal en presence d'un ouvrage reflechissant. Comparaison avec essais en laboratoire et autres methodes theoriques
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Hardjanto, Fauzi Adi. "A computational procedure for three-dimensional simulation of nonlinear gravity wave propagation and response of floating structures." 2002. http://wwwlib.umi.com/cr/utexas/fullcit?p3099461.

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Books on the topic "Offshore gravity structures"

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Reddy, D. V., and A. S. J. Swamidas. Essentials of Offshore Structures: Framed and Gravity Platforms. Taylor & Francis Group, 2016.

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Reddy, D. V., and A. S. J. Swamidas. Essentials of Offshore Structures: Framed and Gravity Platforms. Taylor & Francis Group, 2016.

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Reddy, D. V., and A. S. J. Swamidas. Essentials of Offshore Structures: Framed and Gravity Platforms. Taylor & Francis Group, 2016.

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Reddy, D. V., and A. S. J. Swamidas. Essentials of Offshore Structures: Framed and Gravity Platforms. Taylor & Francis Group, 2016.

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Book chapters on the topic "Offshore gravity structures"

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Hart, William Brook, Rebecca Cook, and John Harris. "Competitive concrete gravity base foundations for offshore wind farms." In Coasts, marine structures and breakwaters: Adapting to change. Thomas Telford Ltd, 2010. http://dx.doi.org/10.1680/cmsb.41318.0007.

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O’Riordan, N. J., and J. W. Seaman. "Optimization of Underbase Drainage Systems for Gravity Structures on Sand." In Advances in Underwater Technology, Ocean Science and Offshore Engineering. Springer Netherlands, 1993. http://dx.doi.org/10.1007/978-94-017-2473-9_21.

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Gudmestad, Ove Tobias. "Fabrication of Concrete Gravity Foundations as Support Structures for Offshore Wind Turbine Facilities." In Lecture Notes in Civil Engineering. Springer Singapore, 2022. http://dx.doi.org/10.1007/978-981-16-7735-9_55.

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O’Leary, Kieran, Vikram Pakrashi, and Denis Kelliher. "The Influence of Flexible Towers on the Dynamics of Offshore Wind Turbine Gravity Base Structures." In Lecture Notes in Civil Engineering. Springer Singapore, 2018. http://dx.doi.org/10.1007/978-981-13-2306-5_72.

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Jones, Rod, Moray Newlands, and Chris Thistlethwaite. "Determination of the probable failure mechanisms and service life of offshore concrete gravity structures in the OSPAR Maritime Area - research proposal." In Advances in Modeling Concrete Service Life. Springer Netherlands, 2011. http://dx.doi.org/10.1007/978-94-007-2703-8_11.

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Murray, J. J., R. G. Standing, and L. M. Mak. "Wave Loading Model Tests on a Gravity Base Structure." In Advances in Underwater Technology, Ocean Science and Offshore Engineering. Springer Netherlands, 1993. http://dx.doi.org/10.1007/978-94-017-3663-3_9.

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Yin, Rui, Chun-guan Zhang, Hong-chuan Hu, Lei Zhou, and Min Zhao. "Gravity Anomalies and Structural Features of the Vøring Basin in the Norwegian Offshore." In Springer Series in Geomechanics and Geoengineering. Springer Nature Singapore, 2025. https://doi.org/10.1007/978-981-96-2706-6_90.

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Yuan, Leqi, Kun Cheng, Haozhi Bian, Yaping Liao, and Chenxi Jiang. "Numerical Simulation of Flow Boiling Heat Transfer in Helical Tubes Under Marine Conditions." In Springer Proceedings in Physics. Springer Nature Singapore, 2023. http://dx.doi.org/10.1007/978-981-99-1023-6_86.

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AbstractLead-based cooled reactors in most countries and some small reactors at sea use helical tube steam generators. Compared with U-tubes, the convection heat transfer coefficient in the spiral tube is higher, the structure is more compact, and the secondary flow is generated under the action of centrifugal force and gravity, which can achieve the effect of wetting the inner wall of the tube. However, due to the importance of the steam generator in the reactor and the complexity of the flow and boiling in the helical tube, the aggregation behavior of bubbles, the distribution of the two-phase interface and the secondary flow in the tube will significantly affect the heat transfer characteristics, so the gas-liquid phase in the tube is studied. Distribution, changes in heat transfer coefficients, and fluid flow characteristics are very important.In order to study the boiling heat transfer characteristics of helical once-through steam generators under static and marine conditions to provide safe and reliable energy supply for offshore facilities such as marine floating, this study uses STAR-CCM+ software, VOF method and Rohsenow boiling model to study the heat transfer capacity and flow characteristics of flow boiling in a helical tube under swaying and tilting conditions. The gas-liquid phase distribution characteristics, secondary flow variation characteristics and convective heat transfer coefficient of the fluid under different swing functions and inclined positions are obtained by numerical calculation, and the law of physical parameters changing with the cycle is found. The research results show that the secondary flow and heat transfer capacity in the tube change with the cycle, and the change is most obvious at the tube length of 0.8m. 5% of the normal condition; when the inclination angle is 45°, the maximum increase of the convection heat transfer coefficient is 16.8%, and the maximum decrease is 6.6%.
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Patel, Minoo H. "Gravity wave theories." In Dynamics of Offshore Structures. Elsevier, 1989. http://dx.doi.org/10.1016/b978-0-408-01074-0.50007-0.

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"- Analysis and Design of Concrete Gravity Platforms." In Essentials of Offshore Structures. CRC Press, 2016. http://dx.doi.org/10.1201/b15033-12.

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Conference papers on the topic "Offshore gravity structures"

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Mathiesen, Troels, Anders Black, and Frits Grønvold. "Monitoring and Inspection Options for Evaluating Corrosion in Offshore Wind Foundations." In CORROSION 2016. NACE International, 2016. https://doi.org/10.5006/c2016-07702.

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Abstract The design of offshore wind foundations is still evolving as large projects are being commissioned or planned for the northern part of Europe. Monopile foundations represent the most common design, but other structure types are also being installed, such as jackets, tripods and gravity foundations. In comparison with offshore structures for oil and gas production, wind foundations present some new challenges for corrosion protection. As the structures are unmanned, the requirements for operation and maintenance must be kept at a minimum. At the same time, the huge water volume in the closed compartment of monopiles raises some concerns about MIC at seabed. The cathodic protection (CP) being applied both outside and inside also involves certain challenges. In this respect, several new approaches for inspection and corrosion monitoring have been applied. The paper reviews specific corrosion risks, such as macro galvanic elements, MIC and insufficient CP. Experiences from evaluating such issues by using various inspection and monitoring techniques are discussed. The applied techniques include UT examination, CP surveys with drop cells and environmental depth profiling. Corrosion has been evaluated using both small coupons and full-length coupons, while real-time measurements have included ER sensors as well as potential and current measurement.
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Finn, W. D. L., R. S. Steedman, M. Yogendrakumar, and R. R. Ledbetter. "Seismic Response of Gravity Structures in a Centrifuge." In Offshore Technology Conference. Offshore Technology Conference, 1985. http://dx.doi.org/10.4043/4885-ms.

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Reppe, Tormod, and Erling HeIsø. "Towage And Installation Of Concrete Gravity-Based Structures." In Offshore Technology Conference. Offshore Technology Conference, 1994. http://dx.doi.org/10.4043/7503-ms.

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Buchner, B., G. E. Loots, G. Z. Forristall, and E. J. van Iperen. "Hydrodynamic Aspects Of Gravity Based Structures In Shallow Water." In Offshore Technology Conference. Offshore Technology Conference, 2004. http://dx.doi.org/10.4043/16716-ms.

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O'Riordan, N. J., and D. G. Clare. "Geotechnical Considerations for the Installation of Gravity Base Structures." In Offshore Technology Conference. Offshore Technology Conference, 1990. http://dx.doi.org/10.4043/6381-ms.

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Bjordal, B. N., and Øyvind Hagen. "Mating Of Large Integrated Decks To Concrete Gravity Structures." In Offshore Technology Conference. Offshore Technology Conference, 1994. http://dx.doi.org/10.4043/7502-ms.

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Chudacek, J., John Holland, J. Roberts, and L. Visser. "Construction of Offshore Concrete Structures in Developing Regions The Malampaya Concrete Gravity Sub-Structure." In Offshore Technology Conference. Offshore Technology Conference, 2002. http://dx.doi.org/10.4043/14223-ms.

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Helland, K., T. J. Kvalstad, V. Karlsen, S. Fjeld, and J. M. Hermstad. "The Brage Platform: A New Generation of Gravity-Base Structures." In Offshore Technology Conference. Offshore Technology Conference, 1991. http://dx.doi.org/10.4043/6699-ms.

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Tavouktsoglou, Nicholas S., John M. Harris, Richard R. Simons, and Richard J. S. Whitehouse. "Bed Shear Stress Distribution Around Offshore Gravity Foundations." In ASME 2015 34th International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/omae2015-41966.

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Offshore gravity foundations are often designed with complex geometries. Such structures interact with the local hydrodynamics and generate enhanced bed shear stresses and flow turbulence capable of scouring the seabed or destabilizing bed armour where deployed. In the present study a novel bed shear stress measurement method has been developed from the camera and laser components of a Particle Image Velocimetry (PIV) system. The bed shear stress amplification was mapped out around six models of gravity foundations with different geometries. Tests were repeated for two bed roughness conditions. The structures tested included uniform cylinders, cylindrical base structures and conical base structures. The flow field around the models was also measured using PIV. The results of this study reveal that the conical base structures generate a different hydrodynamic response compared to the other structures. For uniform cylinders the maximum bed shear stress amplification occurs upstream, at an angle of 45° relative to the flow direction, and measurements were found to agree well with numerical results obtained by Roulund et al. (2005). In the case of the cylindrical base structure the maximum amplification occurs upstream at a similar location to the uniform cylinder case. For the conical base structures the maximum amplification of the bed shear stress occurs on the lee side of the structure, with the magnitude dependent on the side slope of the cone. The bed shear stress results were validated against stresses derived from analysis of the flow fields obtained by the PIV measurements performed under the same test conditions. Conclusions from the study are that the structure with the cylindrical base foundation produces the lowest bed shear stress amplification and that an increase in the bed roughness results in an increase in the amplification of the bed shear stress. These findings have direct implications for design of scour protection. In addition the flow reattachment point behind the foundation is dependent on pile Reynolds number (ReD). This suggests that the results of this study may be extrapolated for higher pile Reynolds using the method described in Roulund et al. (2006).
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Jung, Minuk, and Keum-Seok Kang. "Floating Stability During Installation of Gravity Base Structures." In ASME 2017 36th International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/omae2017-62287.

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In order to obtain more wind energy, offshore wind farms tend to be constructed in deeper water with larger wind turbines. Various kinds of support structures, including gravity base structures, are considered to reduce the CAPEX of wind farms. In this paper, feasibility of floated gravity base structures is investigated through floating stability analysis on lowering operations during the installation. In regard to the baseline model for 30 m water depth with the spherical base and the top diameter of 6 m, the floating stabilities are derived by varying the base diameter and the draft. As it is assumed that the structures are ballasted with sea water during the installation step, free surface effects are taken into account. The relevant structures satisfying the floating stability requirement are derived. It is shown that the structure should be equipped with the bulkheads to satisfy this requirement. Furthermore, the geometry of gravity base structure which minimize the weight of the structure is investigated.
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Reports on the topic "Offshore gravity structures"

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Hölz, Sebastian, and Mirjam Perner. Bathymetric and microbial investigations at the Grimsey Vent Field (Iceland), Cruise No. AL595, 31.5. – 20.6.2023, Kiel (Germany) – Grimsey Vent Field (Iceland) – Kiel (Germany) AUV@GVF. GEOMAR Helmholtz Centre for Ocean Research Kiel, Germany, 2023. http://dx.doi.org/10.3289/cr_al595.

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During research cruise AL595 (31.5. - 20.6.2023) onboard research vessel ALKOR, investigations were carried out at the Grimsey Hydrothermal Field offshore Northern Iceland as part of the Helmholtz InnoPool project “High CO2 – metabolic responses and bioeconomic opportunities”. For the first time, the Hover-AUVs Anton and Luise were successfully operated at water depths of up to 400m, which is close to the maximum operational depth of 500m specified for these Girona 500 AUVs. AUV Anton was used to measure high resolution multibeam data with a horizontal resolution of approximately 40cm cov- ering a total area of ca. 1.4km2. AUV Luise acquired five photo-mosaics with sub-centimeter resolution covering a total area of ca. 5.000m2. In addition, both AUVs carried CTD probes, which will allow to investigate the local distribution of hydrothermal activity. Both high-resolution bathymetry and pho- togrammetry data yield new insights into the morphology and overall structure of the vent site and its surrounding, which will be valuable for the interpretation of geophysical data previously acquired in the working area. Sampling with a multicorer (three successful deployments), a 300cm long gravity corer (five successful deployments), a BIGO lander (two successful deployments) and casts with the CTD- rosette (seven deployments) generated fluid, pore-fluid and sediment samples to be analyzed by the working groups Geomicrobiology and Biogeochemistry, Marine Natural Products and Marine Geochem- istry at GEOMAR and at Matís (Iceland, Natural Products only). Lab work to be carried out in the home labs will yield insights into the physiological adaptation of microbial communities and individual microbes to very high CO2 concentrations and will explore microbial utilization of CO2 for establishing CO2-based bioeconomic value chains. (Alkor-Berichte ; AL595)
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