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Submarine pipeline

About: Submarine pipeline is a(n) research topic. Over the lifetime, 2635 publication(s) have been published within this topic receiving 21300 citation(s).

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Book ChapterDOI
01 Jan 2010
Abstract: Submarine mass movements represent major offshore geohazards due to their destructive and tsunami-generation potential. This potential poses a threat to human life as well as to coastal, near shore and offshore engineering structures. Recent examples of catastrophic submarine landslide events that affected human populations (including tsunamis) are numerous; e.g., Nice airport in 1979 (Dan et al. 2007), Finneidfjord in 1996 (e.g., L’Heureux et al., this volume, Steiner et al., this volume), Papua-New Guinea in 1998 (Tappin et al. 2001), Stromboli in 2002 (Chiocci et al. 2008), and the 2006 and 2009 failures in the submarine cable network around Taiwan (Hsu et al. 2008). The Great East Japan Earthquake of March 2011 also generated submarine landslides that may have amplified effects of the devastating tsunami as shown in Fryer et al. (2004). Given that 30% of the World’s population lives within 60 km of the coast, the hazard posed by submarine landslides is expected to grow as global sea level rises. In addition, the deposits resulting from such processes provide-various types of constraints to offshore development (Shipp et al. 2004), and have significant implications for non-renewable energy resource exploration and production (Weimer and Shipp 2004; Beaubouef and Abreu 2010).

349 citations

Journal ArticleDOI
Abstract: The source of the local tsunami of 17th July 1998 that struck the north shore of Papua New Guinea remains controversial, and has been postulated as due either to seabed dislocation (fault) or sediment slump. Alternative source mechanisms of the tsunami were addressed by offshore investigation using multibeam bathymetry, sub-bottom profiling, sediment sampling and observation from the JAMSTEC Dolphin 3 K Remotely Operated Vehicle and Shinkai 2000 Manned Submersible. The area offshore of Sissano is a complex active convergent margin with subduction taking place along the New Guinea Trench. Dominant transpressional convergence results in diachronous collision of the highstanding North Bismarck Sea Plate in a westerly direction. The result is a morphological variation along the Inner Trench Slope, with the boundary between eastern and western segments located offshore Sissano in an area of on- and offshore subsidence. This subsidence, together with nearshore bathymetric focusing, is considered to increase the tsunamigenic potential of the Sissano area. The offshore data allow discrimination between tsunami generating mechanisms with the most probable source mechanism of the local tsunami as a sediment slump located offshore of Sissano Lagoon. The approximately 5–10 km 3 slump is located in an arcuate, amphitheatre-shaped structure in cohesive sediments that failed through rotational faulting. In the area of the amphitheatre there is evidence of recent seabed movement in the form of fissures, brecciated angular sediment blocks, vertical slopes, talus deposits and active fluid expulsion that maintains a chemosynthetic vent fauna. Dating of the slump event may be approximated by the age of the chemosynthetic faunas as well as by a seismic signal from the failing sediment mass. Faults in the area offshore Sissano are mainly dip–slip to the north with recent movement only along planes of limited lateral extent. A possible thrust fault is of limited extent and with minimal (cm) reverse movement. Further numerical modelling of the tsunami also supports the slump as source over fault displacements.

324 citations

12 Jul 2017
Abstract: Introduction The Offshore Environment Offshore Site Investigation Soil Behaviour Piled Foundations Shallow Foundations Anchoring Systems Mobile Drilling Rigs Pipeline and Riser Geotechnics Geohazards

218 citations

Journal ArticleDOI
Abstract: Compressive forces may be induced in pipelines by the restraint of axial extensions due to temperature changes or other causes. These forces may cause vertical or lateral buckling of the pipeline. These two buckling modes, which both involve an overall column-type response without gross distortion of the pipeline cross-section, are analyzed on the basis of related work on railroad track. For normal coefficients of friction, the lateral mode occurs at a lower axial load than the vertical mode and is dominant in pipelines unless the line is trenched or buried. The theoretical solutions are illustrated by numerical results for a typical pipeline and some design implications reviewed.

209 citations

Journal ArticleDOI
Abstract: x8090 Submarine canyons serve as active conduits joining the shallow waters of the shelf to the deeper waters offshore. Canyon currents are generated by many forces, including those related to wind, surface waves, internal waves, tides, and suspended sediment. Studies of canyon currents indicate that submarine canyons can generally be divided into deep- and shallow-water regimes that are dominated by specific driving forces. The deep-water regime is generally exposed to energy from tides, intern al waves, and spin-off eddies from large-scale current systems, whereas the shallow-water areas are dominated by currents related to surface waves and wind. Strong down-canyon currents appear to be caused by a unique combination of air-sea-Iand interactions consisting of 1. a pile-up of water along the shoreline caused by strong onshore winds; 2. down-canyon pulses of water associated with groups of high incident waves; 3. excitation of standing edge waves that produce longer-period up-and down-canyon oscillations; and finally, 4. the formation of discrete pulses of down-canyon motion, which become more intense and lead to sustained down-canyon currents, as the weight of the sediment suspended by the currents overcomes the density stratification of the deeper water. Simultaneous measurements of currents and pressure in Scripps Submarine Canyon, and of winds, waves, and pressure over the adjacent shelf have been made for several years, with the strongest down-canyon current measured, 1.9 m sec-1 at a depth of 44 m, being recorded during the

208 citations

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