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Scour and liquefaction issues for anchors and other subsea structures in floating offshore wind farms: A review

Water Science and Engineering 2022年第1期15卷 3-14页

作者： B.Mutlu Sumer Veysel Sadan Ozgur Kirca BM SUMER Consultancy&Research ITU ARI Teknokent 1Nol5Istanbul 34467Turkey Department of Civil Engineering Istanbul Technical UniversityMaslak 34467Turkey

This article reviews scouring and liquefaction issues for anchor foundations of floating offshore wind *** review is organized in two sections:(1)the scouring issues for drag-embedment anchors(DEAs)and other subsea structures associated with DEAs such as tensioners,clump weights,and chains in floating offshore wind farms;and(2)the liquefaction issues for the same types of structures,particularly for *** scouring processes are described in detail,and the formulae and design guidelines for engineering predictions are included for quantities like scour depth,time scale,and sinking due to general shear failure of the bed soil caused by scoui\The latter is furnished with numerical ***,in the second section,the liquefaction processes are described with special reference to residual liquefaction where pore-water pressure builds up in undrained soils(such as fine sand and silt)under waves,leading to liquefaction of the bed soil and precipitating failure of DEAs and their associated subsea *** integrated mathematical model to deal with liquefaction around and the resulted sinking failure of DEAs,introduced in a recent study,has been *** of the model is illustrated with a numerical *** is believed that the present review and the existing literatures from the"neighboring"fields form a complementary source of information on scour and liquefaction around foundations of floating offshore wind farms.

关键词： floating structures Liquefaction Offshore structures Offshore wind energy Renewable energy Scouring

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Seabed structures and foundations related to deep-sea resource development:A review based on design and research

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Deep Underground Science and Engineering 2024年第2期3卷 131-148页

作者： Shengjie Rui Haojie Zhang Hang Xu Xing Zha Mengtao Xu Kanmin Shen Key Laboratory of Offshore Geotechnics and Material of Zhejiang Province College of Civil Engineering and ArchitectureZhejiang UniversityHangzhouChina Advanced Modelling Offshore EnergyNorwegian Geotechnical InstituteOsloNorway Geotechnical Technology Center(Overseas Engineering Center) PowerChina Huadong Engineering Corporation LimitedHangzhouChina

The deep‐sea ground contains a huge amount of energy and mineral resources,for example,oil,gas,and *** infrastructures such as floating structures,seabed structures,and foundations have been developed to exploit these *** seabed structures and foundations can be mainly classified into three types:subsea production structures,offshore pipelines,and *** study reviewed the development,installation,and operation of these infrastructures,including their structures,design,installation,marine environment loads,and *** this basis,the research gaps and further research directions were explored through this literature ***,different floating structures were briefly analyzed and reviewed to introduce the design requirements of the seabed structures and ***,the subsea production structures,including subsea manifolds and their foundations,were reviewed and ***,the basic characteristics and design methods of deep‐sea pipelines,including subsea pipelines and risers,were analyzed and ***,the installation and bearing capacity of deep‐sea subsea anchors and seabed trench influence on the anchor were *** the review,it was found that marine environment conditions are the key inputs for any offshore structure *** fabrication,installation,and operation of infrastructures should carefully consider the marine loads and geological *** structures have their own mechanical *** fatigue and stability of pipelines mainly depend on the soil‐structure *** selection should consider soil types and possible trench *** focuses and research gaps can provide a helpful guide on further research,installation,and operation of deep‐sea structures and foundations.

关键词： anchors floating structures pipelines risers subsea foundations

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Hydrodynamic Performance of A New Concept of Spar

Hydrodynamic Performance of A New Concept of Spar

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作者： Yang ZHOU Zhongming LI School of Port and Transportation Engineering Zhejiang Ocean University

A new concept of Spar,named S-Spar,is proposed in this *** is characterized by a slim cylindrical midsection which will lead to moderate wave load and a circular central *** diameter of the midsection is the same as that of the centre ***,three heave plates with the same diameter as the hull of S-Spar could be equipped on *** this paper,the conceptual design of S-Spar is released at *** then,the response amplitude operators（RAOs） of S-Spar are calculated to investigate its dynamic ***,the dynamic responses of S-Spar under the first and second order wave loads are computed to investigate its hydrodynamic performances.A comparison with a typical Truss Spar is made to see whether it has any advantages over Truss Spar and whether or not the design is practical to be applied in *** results show that the dynamic characteristics and hydrodynamic performance of the S-Spar are as expected and comparable to a typical Truss Spar.

关键词： S-Spar floating structures RAOs hydrodynamic analysis wave loads

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