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Offshore geotechnical engineering

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306: 693:. The nature of the seabed has to be taken into account when planning these developments. For instance, a gravity-based structure typically has a very large footprint and is relatively buoyant (because it encloses a large open volume). Under these circumstances, vertical loading of the foundation may not be as significant as the horizontal loads exerted by wave actions and transferred to the seabed. In that scenario, sliding could be the dominant mode of failure. A more specific example is that of the Woodside "North Rankin A" steel jacket structure offshore Australia. The shaft capacity for the 288: 2792: 540: 1864: 1717: 276: 1763: 1676: 1664: 1775: 318: 1826: 1751: 1652: 3751: 2910: 3621: 2899: 621: 609: 2887: 3781: 556: 22: 525: 1799: 2875: 746:, or sliding failure (the pipeline shift sideways), due to low sliding resistance. The process of trenching, when required, needs to take into account soil properties and how they would affect ploughing duration. Buckling potential induced by the axial and transverse response of the buried pipeline during its operational lifespan need to be assessed at the planning phase, and this will depend on the resistance of the enclosing soil. 1852: 1840: 1876: 1787: 3771: 1900: 1816: 1739: 3761: 1640: 670:. This instrument usually consists of four plates welded at 90 degrees from each other at the end of a rod. The rod is then inserted into the soil and a torque is applied to it so as to achieve a constant rotation rate. The torque resistance is measured and an equation is then used to determine the undrained shear strength (and the residual strength), which takes into account the vane's size and geometry. 1888: 1688: 57:
investigations. Today, there are more than 7,000 offshore platforms operating at a water depth up to and exceeding 2000 m. A typical field development extends over tens of square kilometers, and may comprise several fixed structures, infield flowlines with an export pipeline either to the shoreline or connected to a regional trunkline.
228:. The reason is that the orbital motion only extends to a water depth that is half the wavelength, and the maximum possible wavelength is generally considered to be 400 metres (1,300 ft). In shallow water, waves may generate pore pressure build-up in the soil, which may lead to flow slide, and repeated impact on a platform may cause 203: 590:
consists of a series of pipe segments 5 inches (13 cm) in diameter screwed end to end, with a drillbit assembly at the bottom. As the dragbit (teeth extending downward from the drillbit) cut into the soil, soil cuttings are produced. Viscous drilling mud flowing down the drillpipe collects these
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Information on the mechanical strength of the soil can be obtained in situ (from the seabed itself as opposed to in a laboratory from a soil sample). The advantage of this approach is that the data are obtained from soil that has not suffered any disturbance as a result of its relocation. Two of the
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Shallow penetration geotechnical surveys may include soil sampling of the seabed surface or in situ mechanical testing. They are used to generate information on the physical and mechanical properties of the seabed. They extend to the first few meters below the mudline. Surveys done to these depths,
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are a threat to subsea installations, such as pipelines. The risks associated with a particular type of geohazard is a function of how exposed the structure is to the event, how severe this event is and how often it occurs (for episodic events). Any threat has to be monitored, and mitigated for or
144:. Environmental loads act primarily in the horizontal direction, but also have a vertical component. Some of these loads get transmitted to the foundation (the seabed). Wind, wave and current regimes can be estimated from meteorological and oceanographic data, which are collectively referred to as 742:. In both cases, planning of the pipeline involves geotechnical considerations. Pipelines resting on the seabed require geotechnical data along the proposed pipeline route to evaluate potential stability issues, such as passive failure of the soil below it (the pipeline drops) due to insufficient 470:
Geotechnical surveys involve a combination of sampling, drilling, in situ testing as well as laboratory soil testing that is conducted offshore and, with samples, onshore. They serve to ground truth the results of the geophysical investigations; they also provide a detailed account of the seabed
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In this phase, which may take place over a period of several months (depending on project size), information is gathered from various sources, including reports, scientific literature (journal articles, conference proceedings) and databases, with the purpose of evaluating risks, assessing design
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forces induce motion of floating structures in all six degrees of freedom – they are a major design criterion for offshore structures. When a wave's orbital motion reaches the seabed, it induces sediment transport. This only occurs to a water depth of about 200 metres (660 ft), which is the
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are associated with geological activity, geotechnical features and environmental conditions. Shallow geohazards are those occurring at less than 400 metres (1,300 ft) below the seafloor. Information on the potential risks associated with these phenomena is acquired through studies of the
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is another means of sampling the seabed. It is used to obtain a record of the seabed stratigraphy or the rock formations below it. The set-up used to sample an offshore structure's foundation is similar to that used by the oil industry to reach and delineate hydrocarbon reservoirs, with some
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must also be taken into account. The need for offshore developments stems from a gradual depletion of hydrocarbon reserves onshore or near the coastlines, as new fields are being developed at greater distances offshore and in deeper water, with a corresponding adaptation of the offshore site
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making up each of the structure's legs was estimated on the basis of conventional design methods, notably when driven into siliceous sands. But the soil at that site was a lower capacity calcareous sand. Costly remediation measures were required to correct this oversight.
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60 degrees). As it is pushed into the soil, the resistance to penetration is measured, thereby providing an indication of soil strength. A sleeve behind the cone allows the independent determination of the frictional resistance. Some cones are also able to measure
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to depths extending up to a few 100 meters below the mudline. These surveys are done when larger structures are planned at these locations. Deep drill holes require a few days during which the drilling unit has to remain exactly in the same position (see
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that derive their capacity from the frictional and/or bearing resistance of the soil surrounding them. This is converse to gravity anchors that derive their capacity from their weight. As offshore developments move into deeper waters,
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which may be conducted at the same time as the shallow geophysical survey, may suffice if the structure to be deployed at that location is relatively light. These surveys are also useful for planning subsea pipeline routes.
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may also be an issue. All of these phenomena may affect the integrity or the serviceability of the structure and its foundation during its operational lifespan – they need to be taken into account in offshore design.
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Younes A.I., Gibson J.L. and Shipp R.C. (2005) Geohazard assessment of the deepwater Princess field in the Northeastern Gulf of Mexico: Example of evaluating complex faulting in a subsea development,
242:, they may also exert upward or downward forces on structural surfaces and can induce the vibration of wire lines and pipelines. Currents are responsible for eddies around a structure, which cause 422:
can be used for various purposes. One is to study the bathymetry in the location of interest and to produce an image of the seafloor (irregularities, objects on the seabed, lateral variability,
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geomorphology, geological setting and tectonic framework in the area of interest, as well as with geophysical and geotechnical surveys of the seafloor. Examples of potential threats include
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of the soil is either normally consolidated (due to slow sediment deposition), overconsolidated (in places, a relic of glaciation) or underconsolidated (due to high sediment input).
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Hogan P., Lane A., Hooper J., Broughton A. and Romans B. (2008) Geohazard challenges of the Woodside OceanWay Secure Energy LNG development, offshore Southern California,
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are another common type of man-made structure in the offshore environment. These structures either rest on the seabed, or are placed inside a trench to protect them from
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Newson T.A., Bransby M.F., Brunning P. and Morrow D.R. (2004) Determination of undrained shear strength parameters for buried pipeline stability in deltaic soft clays,
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stratigraphy and soil engineering properties. Depending on water depth and metocean conditions, geotechnical surveys may be conducted from a dedicated
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Total sediment thickness varies on a regional scale – it is normally higher near the coastline than it is away from it, where it is also finer grained.
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has to take into account the soil properties, notably its undrained shear strength. The same is true for the installation and capacity assessment of
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become less economical due to the large required size and cost of transportation. This proves opportune for the employment of embedded anchors.
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Bransby M.F., Yun G.J. Morrow D.R. and Brunning P. (2005) The performance of pipeline ploughs in layered soils. In: S.C.M. Gourvenec (Editor),
595:, different tools can be used for sampling the soil from a drill hole, notably "Shelby tubes", "piston samplers" and "split spoon samplers". 152:-induced loading can also occur – they proceed in the opposite direction: from the foundation to the structure. Depending on location, other 2946: 2553: 1467:
Cathie D.N., Jaeck C., Ballard J.-C. and Wintgens J.-F. (2005) Pipeline geotechnics – state-of-the-art. In: S.C.M. Gourvenec (Editor),
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Zhang J. and Erbrich C.T. (2005) Stability design of untrenched pipelines – geotechnical aspects. In: S.C.M. Gourvenec (Editor),
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Marine sediments are composed of detrital material as well as remains of marine organisms, the latter making up calcareous soils.
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are examples of such structures. The seabed has to be able to withstand the weight of these structures and the applied loads.
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or other means. They are done at a series of specific locations, while the vessel maintains a constant position.
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Two types of seismic profiles (top: chirp; bottom: Water gun) of a fault within the seabed in the Gulf of Mexico.
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Kolk H.J. and Wegerif J. (2005) Offshore site investigations: new frontiers. In: S.C.M. Gourvenec (Editor),
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A 3-D image of the Monterey Canyon system, an example of what can be obtained from multibeam echosounders.
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Worldwide distribution of gas hydrates, which are another potential hazard for offshore developments.
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Offshore structures are tall, often extending over 100 metres (330 ft) above their foundation.
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environment has several implications for geotechnical engineering. These include the following:
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The purpose of deep penetration geotechnical surveys is to collect information on the seabed
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For instance, a given structure may undergo 2x10 wave cycles during its design service life.
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Diagram showing the principle of a cone penetrometer to obtain the soil's strength profile.
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and Been K. (2011) Pipeline geohazards for Arctic conditions. In: W.O. McCarron (Editor),
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The codes and technical standards are different from those used for onshore developments.
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Peuchen L.J. and Raap C., (2007) Logging, sampling and testing for offshore geohazards,
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Following are some to the features characterizing the soil in an offshore environment:
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due current-induced oscillations. Trenching is also used to protect pipelines from
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Design modifications during construction are either unfeasible or very expensive.
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is a rod-shaped tool whose end has the shape of a cone with a known apex angle (
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Proceedings of the 14th International Offshore and Polar Engineering Conference
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In places, the seabed can be devoid of sediment, due to strong bottom currents.
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Offshore structures typically have to contend with significant lateral loads (
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are a source of horizontal loading for offshore structures. Because of the
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data are some of the information that are sought after during that phase.
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Offshore site investigations are not unlike those conducted onshore (see
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Ground improvement (on the seabed) and site investigation are expensive.
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Sub-field of engineering concerned with human-made structures in the sea
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The environmental and financial costs in case of failure can be higher.
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cuttings and carry them up outside the drillpipe. As is the case for
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The design life of these structures often ranges between 25–50 years.
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An example of a side scan sonar, a device used to survey the seabed.
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Seabed surface sampling can be done with a grab sampler and with a
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Design focuses on ultimate limit state as opposed to deformation.
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Differences between onshore and offshore geotechnical engineering
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Offshore structures are exposed to various environmental loads:
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and erosion of the soil. There are various types of currents:
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large moment loading relative to the weight of the structure).
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most commonly used instruments used for that purpose are the
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with four-point anchoring systems are used for that purpose.
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Proceedings of the 37th Offshore Technology Conference (OTC)
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Proceedings of the 39th Offshore Technology Conference (OTC)
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Proceedings of the 40th Offshore Technology Conference (OTC)
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surveys can be done to obtain information on shallow seabed
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Offshore Geotechnical Engineering – Principles and Practice
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to measure the soil's peak strength and residual strength.
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devices and related equipment, such as single-beam and
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Box corer for extracting soil samples from the seabed.
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Proper seabed characterization is also required for
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Offshore structures are exposed to a wider range of
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Offshore structures and geotechnical considerations
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They may be divided into three phases: 212:Wave action against an offshore structure. 1458: 1448: 1404: 986: 984: 982: 980: 978: 976: 910: 908: 586:differences in the types of testing. The 173:, which are generally assumed to be in a 160: 1420: 1378: 1055: 554: 545:A gravity-driven soil sampler, used for 530:A gravity-driven soil sampler, used for 514: 201: 20: 1256: 1247: 1238: 1229: 1190: 1154: 1106: 598: 465: 3798: 3727:Electrical and electronics engineering 2824:Development of tidal stream generators 1476:Principles of geotechnical engineering 973: 905: 716: 414: 2928: 2713: 1570: 1428:Marine Georesources and Geotechnology 999:Randolph & Gourvenec, Section 2.3 970:Randolph & Gourvenec, Section 2.4 362: 80:presence of carbonates, shallow gas). 3760: 1421:Cardenas, I.C.; et al. 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In cold regions, 316: 304: 286: 274: 2954: 2850:Ocean thermal energy conversion 1548:, Spon Press, N.Y., 550 p. 1499:, Paper OTC19563, Houston. 1364: 1208:Randolph & Gourvenec, p. 44 1151:Randolph & Gourvenec, p. 31 1142:Randolph & Gourvenec, p. 32 1130:Randolph & Gourvenec, p. 34 1008:Randolph & Gourvenec, p. 24 886: 1292:Randolph and Gourvenec, p. 146 947:Randolph & Gourvenec, p. 3 926:Randolph & Gourvenec, p. 1 689:, steel jacket structures and 1: 2257:Mechanically stabilized earth 1450:10.1080/1064119X.2022.2078252 899: 397: 265: 76:Soil conditions are unusual ( 2977:List of engineering branches 2809:List of tidal power stations 2009:Hydraulic conductivity tests 1555:, Paper 17577, Houston. 593:onshore geotechnical surveys 7: 2892:Renewable energy portal 2840:List of offshore wind farms 2762:List of wave power projects 2757:List of wave power stations 2570:Stress distribution in soil 1373:Subsea Engineering Handbook 775: 10: 3837: 1720:Pore pressure measurement 1533:Ramakrishnan T.V. (2008). 1040:Kolk & Wegerif, p. 151 808:Geotechnical investigation 753: 720: 681:are mainly represented by 369:Geotechnical investigation 25:Platforms offshore Mexico. 3745: 3692: 3676: 3628: 3617: 3392: 3334: 3253: 3178: 3105: 2998: 2985: 2962: 2868: 2832: 2799: 2788: 2747: 2627: 2582: 2481: 2473:Preconsolidation pressure 2445: 2436: 2409: 2229: 2178: 2165: 2080: 2034: 2025: 1948: 1868:Standard penetration test 1626: 1613: 1604: 1371:Bai Y. and Bai Q. (2010) 1301:Bai and Bai, pp. 121, 129 761:Offshore embedded anchors 756:Offshore embedded anchors 750:Offshore embedded anchors 3811:Geotechnical engineering 1969:California bearing ratio 1767:Rotary-pressure sounding 1598:Geotechnical engineering 935:Kolk & Wegerif, 2005 879: 803:Geotechnical engineering 770:gravity based structures 691:gravity-based structures 664:undrained shear strength 120:The offshore environment 34:geotechnical engineering 3638:Bachelor of Engineering 3480:Engineering mathematics 2389:Geosynthetic clay liner 2364:Expanded clay aggregate 1984:Proctor compaction test 1925:Crosshole sonic logging 1911:Nuclear densometer test 1668:Geo-electrical sounding 1530:, Paper 18664, Houston. 1337:Zhang and Erbrich, 2005 1022:Peuchen and Raap, 2007. 833:Offshore (hydrocarbons) 640:cone penetrometer (CPT) 232:, and loss of support. 169:The soil is made up of 3737:Structural engineering 3732:Mechanical engineering 3475:Engineering management 2819:Tidal stream generator 2652:Earthquake engineering 2463:Lateral earth pressure 2088:Hydraulic conductivity 1939:Wave equation analysis 1918:Exploration geophysics 1810:Deformation monitoring 1779:Rotary weight sounding 734:, dragging anchors or 560: 473:geotechnical drillship 452:multibeam echosounders 213: 161:The nature of the soil 26: 3821:Engineering education 3717:Aerospace engineering 3630:Engineering education 2855:Offshore construction 1830:Settlement recordings 1755:Rock control drilling 1656:Cone penetration test 1488:Gerwick B.C., (2000) 1052:Palmer and Been, 2011 848:Seabed gouging by ice 823:Offshore construction 793:Floating wind turbine 577:mechanical properties 558: 515:Sampling and drilling 442:are conducted from a 211: 136:and, in cold oceans, 24: 3806:Offshore engineering 3658:Graduate certificate 2845:Marine current power 2692:Agricultural science 2394:Cellular confinement 1535:Offshore Engineering 1379:Barrette, P (2011). 1358:Bransby et al., 2005 1328:Ramakrishnan, p. 186 1319:Palmer and King 2008 961:Cardenas et al. 2022 740:gouging by ice keels 599:In situ soil testing 466:Geotechnical surveys 391:Geotechnical surveys 356:gouging ice features 3643:Bachelor of Science 3485:Engineering physics 3469:Engineering drawing 2991:Interdisciplinarity 2584:Numerical analysis 2468:Overburden pressure 2458:Pore water pressure 2238:Shoring structures 2113:Reynolds' dilatancy 2014:Water content tests 1999:Triaxial shear test 1959:Soil classification 1932:Pile integrity test 1481:Dean E.T.R. (2010) 1441:2023MGG....41..589C 1397:2011CRST...69....3B 1310:Bai and Bai, p. 131 1226:Newson et al., 2004 1217:Dean, section 2.3.4 1082:Younes et al., 2005 728:Submarine pipelines 717:Submarine pipelines 679:Offshore structures 660:pore water pressure 509:dynamic positioning 489:Dynamic positioning 440:Geophysical surveys 420:Geophysical surveys 415:Geophysical surveys 384:Geophysical surveys 258:, wind-driven, and 248:oceanic circulation 191:consolidation state 50:submarine pipelines 3245:Telecommunications 3150:Naval architecture 2559:Slab stabilisation 2539:Stability analysis 1349:Catie et al., 2005 1283:Ramakrishnan, p. 9 1073:Hogan et al., 2008 868:Submarine pipeline 723:Submarine pipeline 666:of soft to medium 561: 547:coring the seabed. 532:coring the seabed. 436:artificial islands 428:Seismic refraction 363:Site investigation 214: 46:artificial islands 32:is a sub-field of 27: 3793: 3792: 3722:Civil engineering 3668:Licensed engineer 3663:Engineer's degree 3615: 3614: 3447:Building services 3430:Health technology 3291:Chemical reaction 3240:Signal processing 2922: 2921: 2904:Oceans portal 2880:Energy portal 2707: 2706: 2578: 2577: 2554:Sliding criterion 2516:Response spectrum 2432: 2431: 2262:Pressure grouting 2161: 2160: 2021: 2020: 1974:Direct shear test 1680:Permeability test 1178:Dean, section 2.4 1169:Dean, section 2.3 1121:Dean, section 2.2 1103:Dean, section 1.4 828:Offshore drilling 783:Civil engineering 458:, β€˜towfish’ and 209: 3828: 3783: 3773: 3772: 3763: 3762: 3753: 3752: 3623: 3210:Electromechanics 2996: 2995: 2949: 2942: 2935: 2926: 2925: 2912: 2911: 2902: 2901: 2890: 2889: 2878: 2877: 2794: 2734: 2727: 2720: 2711: 2710: 2566:Bearing capacity 2453:Effective stress 2443: 2442: 2344:Land reclamation 2284:Land development 2179:Natural features 2176: 2175: 2143:Specific storage 2032: 2031: 1964:Atterberg limits 1902: 1890: 1878: 1866: 1854: 1842: 1828: 1818: 1803:Screw plate test 1801: 1789: 1777: 1765: 1753: 1741: 1719: 1690: 1678: 1666: 1654: 1642: 1624: 1623: 1591: 1584: 1577: 1568: 1567: 1540:Randolph M. and 1474:Das B.M. (2010) 1464: 1462: 1452: 1410: 1408: 1359: 1356: 1350: 1347: 1338: 1335: 1329: 1326: 1320: 1317: 1311: 1308: 1302: 1299: 1293: 1290: 1284: 1281: 1275: 1272: 1266: 1263: 1254: 1251: 1245: 1242: 1236: 1233: 1227: 1224: 1218: 1215: 1209: 1206: 1200: 1197: 1188: 1185: 1179: 1176: 1170: 1167: 1161: 1158: 1152: 1149: 1143: 1140: 1131: 1128: 1122: 1119: 1113: 1110: 1104: 1101: 1095: 1092: 1083: 1080: 1074: 1071: 1065: 1062: 1053: 1050: 1041: 1038: 1032: 1029: 1023: 1020: 1009: 1006: 1000: 997: 991: 988: 971: 968: 962: 959: 948: 945: 936: 933: 927: 924: 915: 912: 893: 890: 744:bearing capacity 732:fishing trawlers 623: 611: 569:relative density 542: 527: 477:semi-submersible 456:side-scan sonars 320: 308: 290: 278: 260:density currents 240:Bernoulli effect 210: 198:Metocean aspects 3836: 3835: 3831: 3830: 3829: 3827: 3826: 3825: 3796: 3795: 3794: 3789: 3741: 3688: 3672: 3648:Master's degree 3624: 3611: 3525:Instrumentation 3388: 3330: 3296:Electrochemical 3249: 3235:Radio frequency 3174: 3101: 3065:Municipal/Urban 2989: 2987: 2981: 2958: 2953: 2923: 2918: 2896: 2884: 2872: 2864: 2828: 2795: 2786: 2743: 2738: 2708: 2703: 2682:Earth materials 2623: 2585: 2574: 2483: 2477: 2428: 2405: 2359:Earth structure 2354:Erosion control 2252:Ground freezing 2242:Retaining walls 2225: 2167: 2157: 2118:Angle of repose 2076: 2017: 1951: 1944: 1943: 1904:Visible bedrock 1856:Simple sounding 1844:Shear vane test 1620:instrumentation 1619: 1617: 1609: 1600: 1595: 1565: 1367: 1362: 1357: 1353: 1348: 1341: 1336: 1332: 1327: 1323: 1318: 1314: 1309: 1305: 1300: 1296: 1291: 1287: 1282: 1278: 1273: 1269: 1264: 1257: 1252: 1248: 1243: 1239: 1234: 1230: 1225: 1221: 1216: 1212: 1207: 1203: 1198: 1191: 1186: 1182: 1177: 1173: 1168: 1164: 1159: 1155: 1150: 1146: 1141: 1134: 1129: 1125: 1120: 1116: 1111: 1107: 1102: 1098: 1093: 1086: 1081: 1077: 1072: 1068: 1063: 1056: 1051: 1044: 1039: 1035: 1030: 1026: 1021: 1012: 1007: 1003: 998: 994: 989: 974: 969: 965: 960: 951: 946: 939: 934: 930: 925: 918: 913: 906: 902: 897: 896: 891: 887: 882: 877: 788:Earth materials 778: 758: 752: 725: 719: 703:mooring systems 676: 635: 634: 633: 632: 631: 624: 616: 615: 612: 601: 553: 552: 551: 550: 549: 543: 535: 534: 528: 517: 468: 444:research vessel 417: 400: 365: 328: 327: 326: 325: 324: 321: 313: 312: 309: 298: 297: 296: 295: 294: 291: 283: 282: 279: 268: 202: 200: 163: 122: 63: 17: 12: 11: 5: 3834: 3824: 3823: 3818: 3813: 3808: 3791: 3790: 3788: 3787: 3777: 3767: 3757: 3746: 3743: 3742: 3740: 3739: 3734: 3729: 3724: 3719: 3714: 3713: 3712: 3707: 3698: 3696: 3690: 3689: 3687: 3686: 3680: 3678: 3677:Related topics 3674: 3673: 3671: 3670: 3665: 3660: 3655: 3650: 3645: 3640: 3634: 3632: 3626: 3625: 3618: 3616: 3613: 3612: 3610: 3609: 3604: 3599: 3597:Sustainability 3594: 3589: 3584: 3579: 3574: 3569: 3564: 3559: 3554: 3549: 3544: 3539: 3534: 3533: 3532: 3522: 3517: 3512: 3507: 3502: 3497: 3492: 3487: 3482: 3477: 3472: 3466: 3461: 3459:Geoengineering 3456: 3455: 3454: 3444: 3443: 3442: 3440:Rehabilitation 3437: 3435:Pharmaceutical 3432: 3427: 3422: 3420:Bioinformatics 3412: 3407: 3402: 3396: 3394: 3390: 3389: 3387: 3386: 3381: 3379:Semiconductors 3376: 3371: 3369:Nanotechnology 3366: 3361: 3356: 3351: 3346: 3340: 3338: 3332: 3331: 3329: 3328: 3323: 3318: 3313: 3308: 3303: 3298: 3293: 3288: 3287: 3286: 3281: 3276: 3266: 3259: 3257: 3251: 3250: 3248: 3247: 3242: 3237: 3232: 3227: 3222: 3217: 3212: 3207: 3202: 3201: 3200: 3190: 3184: 3182: 3176: 3175: 3173: 3172: 3167: 3162: 3157: 3152: 3147: 3142: 3137: 3132: 3127: 3122: 3117: 3111: 3109: 3103: 3102: 3100: 3099: 3098: 3097: 3092: 3085:Transportation 3082: 3077: 3072: 3067: 3062: 3057: 3052: 3047: 3042: 3041: 3040: 3035: 3025: 3020: 3015: 3010: 3004: 3002: 2993: 2983: 2982: 2980: 2979: 2974: 2969: 2963: 2960: 2959: 2952: 2951: 2944: 2937: 2929: 2920: 2919: 2917: 2916: 2906: 2894: 2882: 2869: 2866: 2865: 2863: 2862: 2857: 2852: 2847: 2842: 2836: 2834: 2830: 2829: 2827: 2826: 2821: 2816: 2811: 2805: 2803: 2797: 2796: 2789: 2787: 2785: 2784: 2779: 2774: 2769: 2764: 2759: 2753: 2751: 2745: 2744: 2737: 2736: 2729: 2722: 2714: 2705: 2704: 2702: 2701: 2700: 2699: 2689: 2684: 2679: 2674: 2669: 2664: 2659: 2654: 2649: 2644: 2639: 2633: 2631: 2629:Related fields 2625: 2624: 2622: 2621: 2616: 2611: 2606: 2601: 2596: 2590: 2588: 2580: 2579: 2576: 2575: 2573: 2572: 2563: 2562: 2561: 2556: 2551: 2549:Classification 2546: 2541: 2530: 2529: 2528: 2523: 2521:Seismic hazard 2518: 2508: 2503: 2498: 2493: 2487: 2485: 2479: 2478: 2476: 2475: 2470: 2465: 2460: 2455: 2449: 2447: 2440: 2434: 2433: 2430: 2429: 2427: 2426: 2421: 2415: 2413: 2407: 2406: 2404: 2403: 2398: 2397: 2396: 2391: 2386: 2381: 2371: 2366: 2361: 2356: 2351: 2346: 2341: 2336: 2331: 2326: 2321: 2316: 2311: 2306: 2301: 2296: 2291: 2286: 2281: 2280: 2279: 2274: 2269: 2264: 2259: 2254: 2249: 2244: 2235: 2233: 2227: 2226: 2224: 2223: 2218: 2213: 2208: 2203: 2198: 2193: 2188: 2182: 2180: 2173: 2163: 2162: 2159: 2158: 2156: 2155: 2150: 2148:Shear strength 2145: 2140: 2135: 2130: 2125: 2123:Friction angle 2120: 2115: 2110: 2105: 2100: 2095: 2090: 2084: 2082: 2078: 2077: 2075: 2074: 2069: 2064: 2059: 2054: 2049: 2044: 2038: 2036: 2029: 2023: 2022: 2019: 2018: 2016: 2011: 2006: 2004:Oedometer test 2001: 1996: 1994:Sieve analysis 1991: 1986: 1981: 1976: 1971: 1966: 1961: 1956: 1954: 1946: 1945: 1942: 1941: 1935: 1934: 1928: 1927: 1921: 1920: 1914: 1913: 1907: 1906: 1895: 1894: 1883: 1882: 1880:Total sounding 1871: 1870: 1859: 1858: 1847: 1846: 1835: 1834: 1833: 1832: 1822: 1806: 1805: 1794: 1793: 1782: 1781: 1770: 1769: 1758: 1757: 1746: 1745: 1734: 1733: 1732: 1731: 1726: 1712: 1711: 1710: 1709: 1704: 1699: 1683: 1682: 1671: 1670: 1659: 1658: 1647: 1646: 1635: 1634: 1632: 1621: 1611: 1610: 1605: 1602: 1601: 1594: 1593: 1586: 1579: 1571: 1564: 1563: 1556: 1549: 1538: 1531: 1524: 1514: 1507: 1500: 1493: 1486: 1479: 1472: 1465: 1435:(6): 589–619. 1418: 1411: 1376: 1368: 1366: 1363: 1361: 1360: 1351: 1339: 1330: 1321: 1312: 1303: 1294: 1285: 1276: 1267: 1255: 1246: 1237: 1228: 1219: 1210: 1201: 1189: 1187:Dean, Fig. 2.5 1180: 1171: 1162: 1153: 1144: 1132: 1123: 1114: 1105: 1096: 1084: 1075: 1066: 1054: 1042: 1033: 1024: 1010: 1001: 992: 972: 963: 949: 937: 928: 916: 903: 901: 898: 895: 894: 884: 883: 881: 878: 876: 875: 870: 865: 863:Soil mechanics 860: 855: 850: 845: 840: 835: 830: 825: 820: 815: 810: 805: 800: 795: 790: 785: 779: 777: 774: 754:Main article: 751: 748: 721:Main article: 718: 715: 675: 672: 668:cohesive soils 625: 618: 617: 613: 606: 605: 604: 603: 602: 600: 597: 544: 537: 536: 529: 522: 521: 520: 519: 518: 516: 513: 467: 464: 446:equipped with 416: 413: 399: 396: 395: 394: 388: 380: 364: 361: 322: 315: 314: 310: 303: 302: 301: 300: 299: 292: 285: 284: 280: 273: 272: 271: 270: 269: 267: 264: 199: 196: 195: 194: 187: 184: 181: 178: 162: 159: 121: 118: 117: 116: 113: 110: 107: 104: 101: 94: 91: 84: 81: 74: 62: 59: 15: 9: 6: 4: 3: 2: 3833: 3822: 3819: 3817: 3814: 3812: 3809: 3807: 3804: 3803: 3801: 3786: 3782: 3778: 3776: 3768: 3766: 3758: 3756: 3748: 3747: 3744: 3738: 3735: 3733: 3730: 3728: 3725: 3723: 3720: 3718: 3715: 3711: 3708: 3706: 3703: 3702: 3700: 3699: 3697: 3695: 3691: 3685: 3682: 3681: 3679: 3675: 3669: 3666: 3664: 3661: 3659: 3656: 3654: 3651: 3649: 3646: 3644: 3641: 3639: 3636: 3635: 3633: 3631: 3627: 3622: 3608: 3605: 3603: 3600: 3598: 3595: 3593: 3590: 3588: 3585: 3583: 3580: 3578: 3575: 3573: 3570: 3568: 3565: 3563: 3560: 3558: 3555: 3553: 3550: 3548: 3545: 3543: 3540: 3538: 3535: 3531: 3528: 3527: 3526: 3523: 3521: 3518: 3516: 3513: 3511: 3508: 3506: 3503: 3501: 3498: 3496: 3493: 3491: 3488: 3486: 3483: 3481: 3478: 3476: 3473: 3470: 3467: 3465: 3462: 3460: 3457: 3453: 3450: 3449: 3448: 3445: 3441: 3438: 3436: 3433: 3431: 3428: 3426: 3423: 3421: 3418: 3417: 3416: 3413: 3411: 3408: 3406: 3403: 3401: 3398: 3397: 3395: 3391: 3385: 3382: 3380: 3377: 3375: 3372: 3370: 3367: 3365: 3362: 3360: 3357: 3355: 3352: 3350: 3347: 3345: 3342: 3341: 3339: 3337: 3333: 3327: 3324: 3322: 3319: 3317: 3314: 3312: 3309: 3307: 3304: 3302: 3299: 3297: 3294: 3292: 3289: 3285: 3282: 3280: 3277: 3275: 3272: 3271: 3270: 3267: 3264: 3261: 3260: 3258: 3256: 3252: 3246: 3243: 3241: 3238: 3236: 3233: 3231: 3228: 3226: 3223: 3221: 3218: 3216: 3213: 3211: 3208: 3206: 3203: 3199: 3196: 3195: 3194: 3191: 3189: 3186: 3185: 3183: 3181: 3177: 3171: 3168: 3166: 3163: 3161: 3158: 3156: 3153: 3151: 3148: 3146: 3143: 3141: 3140:Manufacturing 3138: 3136: 3133: 3131: 3130:Biomechanical 3128: 3126: 3123: 3121: 3118: 3116: 3113: 3112: 3110: 3108: 3104: 3096: 3093: 3091: 3088: 3087: 3086: 3083: 3081: 3078: 3076: 3073: 3071: 3068: 3066: 3063: 3061: 3058: 3056: 3053: 3051: 3048: 3046: 3043: 3039: 3036: 3034: 3031: 3030: 3029: 3028:Environmental 3026: 3024: 3021: 3019: 3016: 3014: 3011: 3009: 3008:Architectural 3006: 3005: 3003: 3001: 2997: 2994: 2992: 2984: 2978: 2975: 2973: 2970: 2968: 2965: 2964: 2961: 2957: 2950: 2945: 2943: 2938: 2936: 2931: 2930: 2927: 2915: 2907: 2905: 2900: 2895: 2893: 2888: 2883: 2881: 2876: 2871: 2870: 2867: 2861: 2860:Osmotic power 2858: 2856: 2853: 2851: 2848: 2846: 2843: 2841: 2838: 2837: 2835: 2831: 2825: 2822: 2820: 2817: 2815: 2814:Tidal barrage 2812: 2810: 2807: 2806: 2804: 2802: 2798: 2793: 2783: 2780: 2778: 2777:United States 2775: 2773: 2770: 2768: 2765: 2763: 2760: 2758: 2755: 2754: 2752: 2750: 2746: 2742: 2741:Marine energy 2735: 2730: 2728: 2723: 2721: 2716: 2715: 2712: 2698: 2695: 2694: 2693: 2690: 2688: 2685: 2683: 2680: 2678: 2675: 2673: 2670: 2668: 2665: 2663: 2660: 2658: 2657:Geomorphology 2655: 2653: 2650: 2648: 2645: 2643: 2640: 2638: 2635: 2634: 2632: 2630: 2626: 2620: 2617: 2615: 2612: 2610: 2607: 2605: 2602: 2600: 2597: 2595: 2592: 2591: 2589: 2587: 2581: 2571: 2567: 2564: 2560: 2557: 2555: 2552: 2550: 2547: 2545: 2542: 2540: 2537: 2536: 2534: 2531: 2527: 2524: 2522: 2519: 2517: 2514: 2513: 2512: 2509: 2507: 2504: 2502: 2501:Consolidation 2499: 2497: 2496:Frost heaving 2494: 2492: 2489: 2488: 2486: 2480: 2474: 2471: 2469: 2466: 2464: 2461: 2459: 2456: 2454: 2451: 2450: 2448: 2444: 2441: 2439: 2435: 2425: 2422: 2420: 2417: 2416: 2414: 2412: 2408: 2402: 2399: 2395: 2392: 2390: 2387: 2385: 2382: 2380: 2377: 2376: 2375: 2374:Geosynthetics 2372: 2370: 2369:Crushed stone 2367: 2365: 2362: 2360: 2357: 2355: 2352: 2350: 2347: 2345: 2342: 2340: 2337: 2335: 2332: 2330: 2327: 2325: 2324:Cut-and-cover 2322: 2320: 2317: 2315: 2312: 2310: 2307: 2305: 2302: 2300: 2297: 2295: 2292: 2290: 2287: 2285: 2282: 2278: 2275: 2273: 2270: 2268: 2265: 2263: 2260: 2258: 2255: 2253: 2250: 2248: 2245: 2243: 2240: 2239: 2237: 2236: 2234: 2232: 2228: 2222: 2219: 2217: 2214: 2212: 2209: 2207: 2204: 2202: 2199: 2197: 2194: 2192: 2189: 2187: 2184: 2183: 2181: 2177: 2174: 2171: 2164: 2154: 2151: 2149: 2146: 2144: 2141: 2139: 2136: 2134: 2131: 2129: 2126: 2124: 2121: 2119: 2116: 2114: 2111: 2109: 2106: 2104: 2101: 2099: 2096: 2094: 2093:Water content 2091: 2089: 2086: 2085: 2083: 2079: 2073: 2070: 2068: 2065: 2063: 2060: 2058: 2055: 2053: 2050: 2048: 2045: 2043: 2040: 2039: 2037: 2033: 2030: 2028: 2024: 2015: 2012: 2010: 2007: 2005: 2002: 2000: 1997: 1995: 1992: 1990: 1987: 1985: 1982: 1980: 1977: 1975: 1972: 1970: 1967: 1965: 1962: 1960: 1957: 1955: 1953: 1947: 1940: 1937: 1936: 1933: 1930: 1929: 1926: 1923: 1922: 1919: 1916: 1915: 1912: 1909: 1908: 1905: 1901: 1897: 1896: 1893: 1889: 1885: 1884: 1881: 1877: 1873: 1872: 1869: 1865: 1861: 1860: 1857: 1853: 1849: 1848: 1845: 1841: 1837: 1836: 1831: 1827: 1823: 1821: 1817: 1813: 1812: 1811: 1808: 1807: 1804: 1800: 1796: 1795: 1792: 1791:Sample series 1788: 1784: 1783: 1780: 1776: 1772: 1771: 1768: 1764: 1760: 1759: 1756: 1752: 1748: 1747: 1744: 1740: 1736: 1735: 1730: 1727: 1725: 1722: 1721: 1718: 1714: 1713: 1708: 1705: 1703: 1700: 1698: 1695: 1694: 1693: 1689: 1685: 1684: 1681: 1677: 1673: 1672: 1669: 1665: 1661: 1660: 1657: 1653: 1649: 1648: 1645: 1641: 1637: 1636: 1633: 1630: 1625: 1622: 1616: 1615:Investigation 1612: 1608: 1603: 1599: 1592: 1587: 1585: 1580: 1578: 1573: 1572: 1569: 1561: 1557: 1554: 1550: 1547: 1543: 1539: 1536: 1532: 1529: 1525: 1522: 1518: 1515: 1512: 1508: 1505: 1501: 1498: 1494: 1491: 1487: 1484: 1480: 1477: 1473: 1470: 1466: 1461: 1460:11250/3058338 1456: 1451: 1446: 1442: 1438: 1434: 1430: 1429: 1424: 1419: 1416: 1412: 1407: 1402: 1398: 1394: 1390: 1386: 1382: 1377: 1374: 1370: 1369: 1355: 1346: 1344: 1334: 1325: 1316: 1307: 1298: 1289: 1280: 1271: 1262: 1260: 1250: 1241: 1232: 1223: 1214: 1205: 1196: 1194: 1184: 1175: 1166: 1157: 1148: 1139: 1137: 1127: 1118: 1109: 1100: 1091: 1089: 1079: 1070: 1064:Barrette 2011 1061: 1059: 1049: 1047: 1037: 1028: 1019: 1017: 1015: 1005: 996: 990:Gerwick, 2000 987: 985: 983: 981: 979: 977: 967: 958: 956: 954: 944: 942: 932: 923: 921: 911: 909: 904: 889: 885: 874: 871: 869: 866: 864: 861: 859: 856: 854: 851: 849: 846: 844: 841: 839: 836: 834: 831: 829: 826: 824: 821: 819: 816: 814: 811: 809: 806: 804: 801: 799: 796: 794: 791: 789: 786: 784: 781: 780: 773: 771: 766: 762: 757: 747: 745: 741: 737: 733: 729: 724: 714: 712: 711:plate anchors 708: 707:suction piles 704: 699: 696: 692: 688: 684: 680: 671: 669: 665: 661: 656: 652: 647: 645: 641: 629: 622: 610: 596: 594: 589: 584: 580: 578: 574: 573:water content 570: 566: 557: 548: 541: 533: 526: 512: 510: 505: 500: 496: 494: 490: 486: 482: 478: 474: 463: 461: 457: 453: 449: 445: 441: 437: 433: 429: 425: 421: 412: 410: 406: 392: 389: 386: 385: 381: 378: 374: 373: 372: 370: 360: 357: 353: 349: 345: 341: 337: 332: 319: 307: 289: 277: 263: 261: 257: 253: 249: 245: 241: 237: 233: 231: 227: 223: 222:shallow water 218: 192: 188: 185: 182: 179: 176: 172: 168: 167: 166: 158: 155: 151: 147: 146:metocean data 143: 139: 135: 131: 127: 114: 111: 108: 105: 102: 99: 95: 92: 89: 85: 82: 79: 75: 72: 71: 70: 68: 58: 55: 51: 47: 43: 42:Oil platforms 39: 35: 31: 23: 19: 3816:Oceanography 3701:Engineering 3547:Mechatronics 3400:Agricultural 3050:Geotechnical 3018:Construction 2677:Biogeography 2672:Hydrogeology 2662:Soil science 2642:Geochemistry 2401:Infiltration 2329:Cut and fill 2272:Soil nailing 2138:Permeability 2103:Bulk density 1820:Inclinometer 1743:Ram sounding 1628: 1606: 1559: 1552: 1545: 1542:Gourvenec S. 1534: 1527: 1520: 1517:Palmer, A.C. 1510: 1503: 1496: 1489: 1482: 1475: 1468: 1432: 1426: 1414: 1388: 1384: 1372: 1365:Bibliography 1354: 1333: 1324: 1315: 1306: 1297: 1288: 1279: 1270: 1249: 1240: 1231: 1222: 1213: 1204: 1183: 1174: 1165: 1156: 1147: 1126: 1117: 1108: 1099: 1078: 1069: 1036: 1027: 1004: 995: 966: 931: 888: 838:Oil platform 759: 726: 710: 700: 678: 677: 654: 648: 636: 588:drill string 581: 562: 504:stratigraphy 501: 497: 469: 432:stratigraphy 418: 401: 390: 382: 376: 366: 352:gas hydrates 329: 234: 230:liquefaction 225: 221: 215: 164: 123: 87: 77: 66: 64: 29: 28: 18: 3775:Wikiproject 3530:and Control 3520:Information 3344:Biomaterial 3274:Bioresource 3265:/Bioprocess 3263:Biochemical 3215:Electronics 2986:Specialties 2956:Engineering 2801:Tidal power 2772:New Zealand 2687:Archaeology 2411:Foundations 2384:Geomembrane 2267:Slurry wall 2206:Water table 2170:Interaction 2166:Structures 2153:Sensitivity 1950:Laboratory 1391:(1): 3–20. 1265:Das, p. 406 1253:Dean, p. 60 1244:Das, p. 646 1235:Dean, p. 45 1199:Dean, p. 43 1160:Dean, p. 47 1112:Dean, p. 33 813:Geotechnics 687:jackup rigs 252:geostrophic 3800:Categories 3694:Glossaries 3515:Industrial 3495:Facilities 3490:Explosives 3415:Biomedical 3410:Automation 3359:Metallurgy 3269:Biological 3220:Microwaves 3180:Electrical 3125:Automotive 3107:Mechanical 3080:Structural 3045:Geological 3033:Ecological 3023:Earthquake 2749:Wave power 2544:Mitigation 2526:Shear wave 2511:Earthquake 2506:Compaction 2491:Permafrost 2482:Phenomena/ 2379:Geotextile 2304:Embankment 2294:Excavation 2231:Earthworks 2191:Vegetation 2186:Topography 2108:Thixotropy 2098:Void ratio 2081:Properties 1979:Hydrometer 1724:Piezometer 1644:Core drill 1274:Dean, 2010 914:Dean, p. 1 900:References 685:, notably 644:shear vane 628:shear vane 485:hovercraft 483:, a large 481:jackup rig 424:ice gouges 405:Bathymetry 398:Desk study 377:desk study 340:landslides 331:Geohazards 266:Geohazards 226:deep water 154:geohazards 150:Earthquake 98:geohazards 54:Geohazards 3653:Doctorate 3567:Packaging 3537:Logistics 3510:Geomatics 3471:/graphics 3364:Molecular 3354:Corrosion 3336:Materials 3316:Petroleum 3306:Molecular 3188:Broadcast 3170:Tribology 3120:Aerospace 3055:Hydraulic 2767:Australia 2667:Hydrology 2647:Petrology 2535:analysis 2533:Landslide 2438:Mechanics 2349:Track bed 2334:Fill dirt 2319:Terracing 1892:Trial pit 1707:Statnamic 1692:Load test 798:Geohazard 683:platforms 565:box corer 359:removed. 342:, active 175:saturated 171:sediments 3755:Category 3684:Engineer 3592:Software 3587:Security 3562:Ontology 3552:Military 3542:Robotics 3505:Forensic 3425:Clinical 3384:Surfaces 3374:Polymers 3349:Ceramics 3326:Reaction 3255:Chemical 3193:Computer 3115:Acoustic 3070:Offshore 3038:Sanitary 2914:Category 2782:Scotland 2697:Agrology 2586:software 2484:problems 2314:Causeway 2289:Landfill 2216:Subgrade 2133:Porosity 2128:Cohesion 853:Sediment 776:See also 642:and the 583:Drilling 426:, ...). 409:metocean 336:tsunamis 244:scouring 236:Currents 142:icebergs 134:currents 67:offshore 3765:Commons 3607:Textile 3602:Systems 3572:Privacy 3557:Nuclear 3321:Process 3279:Genetic 3225:Optical 3205:Control 3198:outline 3165:Thermal 3155:Railway 3095:Railway 3090:Traffic 3013:Coastal 2972:Outline 2967:History 2637:Geology 2609:SVSlope 2419:Shallow 2339:Grading 2277:Tieback 2221:Subsoil 2211:Bedrock 2201:Topsoil 2196:Terrain 1989:R-value 1952:testing 1702:Dynamic 1629:in situ 1627:Field ( 1544:(2011) 1437:Bibcode 1393:Bibcode 765:anchors 736:fatigue 493:mooring 138:sea ice 3785:Portal 3582:Survey 3577:Safety 3464:Design 3284:Tissue 3160:Sports 3145:Marine 3135:Energy 3060:Mining 2619:Plaxis 2614:UTEXAS 2604:SVFlux 2594:SEEP2D 2446:Forces 2299:Trench 2247:Gabion 2057:Gravel 1697:Static 873:Subsea 843:Seabed 344:faults 3405:Audio 3393:Other 3311:Paper 3230:Power 3075:River 3000:Civil 2833:Other 2599:STABL 2072:Loess 2035:Types 880:Notes 818:Ocean 695:piles 448:sonar 348:karst 256:tidal 130:waves 3500:Fire 3301:Food 2424:Deep 2067:Loam 2062:Peat 2052:Sand 2047:Silt 2042:Clay 2027:Soil 1729:Well 858:Soil 763:are 655:e.g. 649:The 575:and 491:and 479:, a 475:, a 224:and 217:Wave 189:The 140:and 126:wind 88:i.e. 78:e.g. 48:and 3710:M–Z 3705:A–L 3452:MEP 2988:and 2309:Cut 1618:and 1455:hdl 1445:doi 1401:doi 651:CPT 511:). 65:An 40:. 38:sea 3802:: 2568:* 1453:. 1443:. 1433:41 1431:. 1425:. 1399:. 1389:69 1387:. 1383:. 1342:^ 1258:^ 1192:^ 1135:^ 1087:^ 1057:^ 1045:^ 1013:^ 975:^ 952:^ 940:^ 919:^ 907:^ 713:. 646:. 571:, 454:, 438:. 375:A 350:, 338:, 262:. 254:, 250:, 148:. 132:, 128:, 44:, 2948:e 2941:t 2934:v 2733:e 2726:t 2719:v 2172:) 2168:( 1631:) 1590:e 1583:t 1576:v 1463:. 1457:: 1447:: 1439:: 1409:. 1403:: 1395:: 100:.

Index


geotechnical engineering
sea
Oil platforms
artificial islands
submarine pipelines
Geohazards
geohazards
wind
waves
currents
sea ice
icebergs
metocean data
Earthquake
geohazards
sediments
saturated
consolidation state
Wave
liquefaction
Currents
Bernoulli effect
scouring
oceanic circulation
geostrophic
tidal
density currents

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