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This Special Issue includes many advanced high-quality papers that focus on gel applications in the oil and gas industry. The papers in this Special Issue present the new development of gels that can be used as conformance control agents, drilling fluid additives, and hydraulic fracturing agents.

Technology: general issues --- viscoelastic surfactants --- wormlike micelles --- gels --- viscoelasticity --- oil recovery --- hydraulic fracturing --- clean fracturing fluids --- responsiveness to hydrocarbons --- oligomeric surfactants --- nanoparticle/VES fluids --- polymer/VES fluids --- plant press slag (PPS) --- carboxymethylation --- mixture of carboxymethyl cellulose and carboxymethyl starch (CMCS) --- filtrate reducer --- drilling fluids --- fumaric acid sludge (FAS) --- free radical copolymerization --- filtrate loss reducer --- organic wastewater of phthalic anhydride --- oil well drilling fluids --- wellbore stability --- biopolymer --- encapsulator --- water-based drilling fluids --- chemical strengthening --- weak gel --- numerical simulation --- displacement efficiency --- filtration reducer --- high temperature --- water-based drilling fluid --- nanomaterials --- calcium carbonate --- polymer gel --- water coning --- chemical packer --- horizontal well --- offshore oil-field application --- enhanced gel system --- enhanced foam system --- heterogeneous reservoir --- plugging adaptability --- enhanced oil recovery --- low temperature --- high salinity --- conformance control --- salt resistance --- phenolic --- gel --- compound --- staged --- gelling acid fracturing --- temporary plugging --- n/a

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The ocean is the cradle of life and is rich in natural resources. With the worldwide boom in exploration and application of ocean resources, a dramatically increasing amount of coastal engineering and offshore engineering facilities have been constructed in the last few decades. The rapid development of human economic activities and the global climate change have significant impacts on the marine environment, resulting in frequent geological disasters. Under this circumstance, there is an urgent demand for a platform for scientists and engineers to share their state-of-art research outcomes in the field of Marine Engineering Geology. This book is a collection of a series of articles from the 2nd International Symposium of Marine Engineering Geology (ISMEG 2019), presenting some of the recent efforts made towards marine engineering geology and geotechnics, including theoretical advances, laboratory and field testing, design methods, and the potential for further development of these disciplines.

marine soft soil --- double-layer foundation --- consolidation theory --- drainage boundary --- spudcan --- skirted footing --- footprint --- jack-up --- clay --- large deformation analysis --- coral sands --- porous media --- model test --- dispersion --- mechanical dispersion --- molecular diffusion --- soft clay --- cyclic loads --- residual pore pressure --- suction anchor --- wave --- seafloor instability --- pore pressure --- slide surface --- gas distribution --- meshfree method --- Varans --- Biot’s “u − p” approximation --- wave-current induced seabed response --- immersed tunnel --- sediment liquefaction --- heavy metal --- migration --- interior of sediment --- the subaqueous Yellow River Delta --- ocean waves --- double-frequency microseisms --- continental margin --- continental slope --- coral sand --- Fujian sand --- shaking table test --- dynamic response --- pile group --- marine engineering --- seismic liquefaction --- novel liquefaction-resistant structures --- mitigation strategies --- sand wave --- pressure sensing technique --- physical model test --- field application --- wingsail --- aerodynamics --- numerical simulation --- marine silty sand --- small-strain stiffness --- Hardin model --- binary packing model --- dredging and reclamation --- constitutive relationship --- centrifugal experiment --- void ratio–effective stress --- void ratio–permeability coefficient --- n/a --- Biot's "u − p" approximation --- void ratio-effective stress --- void ratio-permeability coefficient

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The ocean is the cradle of life and is rich in natural resources. With the worldwide boom in exploration and application of ocean resources, a dramatically increasing amount of coastal engineering and offshore engineering facilities have been constructed in the last few decades. The rapid development of human economic activities and the global climate change have significant impacts on the marine environment, resulting in frequent geological disasters. Under this circumstance, there is an urgent demand for a platform for scientists and engineers to share their state-of-art research outcomes in the field of Marine Engineering Geology. This book is a collection of a series of articles from the 2nd International Symposium of Marine Engineering Geology (ISMEG 2019), presenting some of the recent efforts made towards marine engineering geology and geotechnics, including theoretical advances, laboratory and field testing, design methods, and the potential for further development of these disciplines.

Technology: general issues --- marine soft soil --- double-layer foundation --- consolidation theory --- drainage boundary --- spudcan --- skirted footing --- footprint --- jack-up --- clay --- large deformation analysis --- coral sands --- porous media --- model test --- dispersion --- mechanical dispersion --- molecular diffusion --- soft clay --- cyclic loads --- residual pore pressure --- suction anchor --- wave --- seafloor instability --- pore pressure --- slide surface --- gas distribution --- meshfree method --- Varans --- Biot's "u − p" approximation --- wave-current induced seabed response --- immersed tunnel --- sediment liquefaction --- heavy metal --- migration --- interior of sediment --- the subaqueous Yellow River Delta --- ocean waves --- double-frequency microseisms --- continental margin --- continental slope --- coral sand --- Fujian sand --- shaking table test --- dynamic response --- pile group --- marine engineering --- seismic liquefaction --- novel liquefaction-resistant structures --- mitigation strategies --- sand wave --- pressure sensing technique --- physical model test --- field application --- wingsail --- aerodynamics --- numerical simulation --- marine silty sand --- small-strain stiffness --- Hardin model --- binary packing model --- dredging and reclamation --- constitutive relationship --- centrifugal experiment --- void ratio-effective stress --- void ratio-permeability coefficient --- marine soft soil --- double-layer foundation --- consolidation theory --- drainage boundary --- spudcan --- skirted footing --- footprint --- jack-up --- clay --- large deformation analysis --- coral sands --- porous media --- model test --- dispersion --- mechanical dispersion --- molecular diffusion --- soft clay --- cyclic loads --- residual pore pressure --- suction anchor --- wave --- seafloor instability --- pore pressure --- slide surface --- gas distribution --- meshfree method --- Varans --- Biot's "u − p" approximation --- wave-current induced seabed response --- immersed tunnel --- sediment liquefaction --- heavy metal --- migration --- interior of sediment --- the subaqueous Yellow River Delta --- ocean waves --- double-frequency microseisms --- continental margin --- continental slope --- coral sand --- Fujian sand --- shaking table test --- dynamic response --- pile group --- marine engineering --- seismic liquefaction --- novel liquefaction-resistant structures --- mitigation strategies --- sand wave --- pressure sensing technique --- physical model test --- field application --- wingsail --- aerodynamics --- numerical simulation --- marine silty sand --- small-strain stiffness --- Hardin model --- binary packing model --- dredging and reclamation --- constitutive relationship --- centrifugal experiment --- void ratio-effective stress --- void ratio-permeability coefficient

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The ocean is the cradle of life and is rich in natural resources. With the worldwide boom in exploration and application of ocean resources, a dramatically increasing amount of coastal engineering and offshore engineering facilities have been constructed in the last few decades. The rapid development of human economic activities and the global climate change have significant impacts on the marine environment, resulting in frequent geological disasters. Under this circumstance, there is an urgent demand for a platform for scientists and engineers to share their state-of-art research outcomes in the field of Marine Engineering Geology. This book is a collection of a series of articles from the 2nd International Symposium of Marine Engineering Geology (ISMEG 2019), presenting some of the recent efforts made towards marine engineering geology and geotechnics, including theoretical advances, laboratory and field testing, design methods, and the potential for further development of these disciplines.

Technology: general issues --- marine soft soil --- double-layer foundation --- consolidation theory --- drainage boundary --- spudcan --- skirted footing --- footprint --- jack-up --- clay --- large deformation analysis --- coral sands --- porous media --- model test --- dispersion --- mechanical dispersion --- molecular diffusion --- soft clay --- cyclic loads --- residual pore pressure --- suction anchor --- wave --- seafloor instability --- pore pressure --- slide surface --- gas distribution --- meshfree method --- Varans --- Biot’s “u − p” approximation --- wave-current induced seabed response --- immersed tunnel --- sediment liquefaction --- heavy metal --- migration --- interior of sediment --- the subaqueous Yellow River Delta --- ocean waves --- double-frequency microseisms --- continental margin --- continental slope --- coral sand --- Fujian sand --- shaking table test --- dynamic response --- pile group --- marine engineering --- seismic liquefaction --- novel liquefaction-resistant structures --- mitigation strategies --- sand wave --- pressure sensing technique --- physical model test --- field application --- wingsail --- aerodynamics --- numerical simulation --- marine silty sand --- small-strain stiffness --- Hardin model --- binary packing model --- dredging and reclamation --- constitutive relationship --- centrifugal experiment --- void ratio–effective stress --- void ratio–permeability coefficient --- n/a --- Biot's "u − p" approximation --- void ratio-effective stress --- void ratio-permeability coefficient

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With rapid developments being made in the exploration of marine resources, coastal geohazard and offshore geotechnics have attracted a great deal of attention from coastal geotechnical engineers, with significant progress being made in recent years. Due to the complicated nature of marine environmnets, there are numerous natural marine geohazard preset throughout the world’s marine areas, e.g., the South China Sea. In addition, damage to offshore infrastructure (e.g., monopiles, bridge piers, etc.) and their supporting installations (pipelines, power transmission cables, etc.) has occurred in the last decades. A better understanding of the fundamental mechanisms and soil behavior of the seabed in marine environments will help engineers in the design and planning processes of coastal geotechnical engineering projects. The purpose of this book is to present the recent advances made in the field of coastal geohazards and offshore geotechnics. The book will provide researchers with information reagrding the recent developments in the field, and possible future developments. The book is composed of eighteen papers, covering three main themes: (1) the mechanisms of fluid–seabed interactions and the instability associated with seabeds when they are under dynamic loading (papers 1–5); (2) evaluation of the stability of marine infrastructure, including pipelines (papers 6–8), piled foundation and bridge piers (papers 9–12), submarine tunnels (paper 13), and other supported foundations (paper 14); and (3) coastal geohazards, including submarine landslides and slope stability (papers 15–16) and other geohazard issues (papers 17–18). The editors hope that this book will functoin as a guide for researchers, scientists, and scholars, as well as practitioners of coastal and offshore engineering.

wave motion --- offshore deposits --- seabed response --- FEM --- pore pressure --- wave-current-seabed interaction --- RANS equations --- k-ε model --- current velocity --- seabed liquefaction --- liquefaction --- lateral displacement --- response surface method (RSM) --- artificial neural network (ANN) --- wave action --- silty sand --- seepage flow --- soil erosion --- pore-pressure accumulation --- three-phase soil model --- immersed tunnel --- trench --- numerical study --- porous seabed --- pumping well test --- groundwater fluctuation --- stratum deformation --- micro-confined aquifer --- wave–current–seabed interaction --- Reynolds-Averaged Navier-Stokesequations --- buried pipeline --- k-ε turbulence model --- oscillatory liquefaction --- wave-soil-pipeline interactions --- meshfree model --- local radial basis functions collocation method --- hydrate-bearing sediments --- damage statistical constitutive model --- multi-field coupling --- wellbore stability --- bridge scour --- identification --- ambient vibration --- field application --- natural frequency --- mode shape --- superstructure --- cable-stayed bridge --- Principal stress rotation --- dynamic loading --- wave (current)-induced soil response --- open-ended pile --- soil plug --- offshore wind turbines --- lateral cyclic loading --- model test --- discrete element simulation --- rock-socketed piles --- monopiles --- impedances --- dynamic responses --- buoyancy --- bottom-supported foundation --- field test --- numerical analysis --- giant submarine landslides --- shelf break --- South China Sea --- Himalayan orogeny --- repeated submarine landslides --- coastal-embankment slope --- stability --- unsaturated soil --- multilayered --- matric suction --- random searching algorithm --- rainfall infiltration --- scour --- soft clay --- monopile --- stress history --- hypoplastic model --- submarine pipeline --- dense seabed foundation --- seismic dynamics --- resonance of submarine pipeline --- FSSI-CAS 2D --- n/a