Dangerous wind waves in the North Atlantic at different regimes of atmospheric circulation     

A. A. Lukin  E. S. Nesterov 《Russian Meteorology and Hydrology》2011,36(12):799-805

Studied are the formation processes of dangerous wind waves in the water area of the North Atlantic during three cold periods (October–March) from 2007 to 2010. Obtained are the estimates of variability of cyclone trajectories, wind fields, and wave height in the North Atlantic at the intensification of zonal or meridional atmospheric circulation.  相似文献   

Composition features of organic compounds and suspended particulate matter in snow-ice cover on fast antarctic ice     

I. A. Nemirovskaya  M. D. Kravchishina  A. P. Lisitzyn  V. A. Artem’ev 《Doklady Earth Sciences》2013,453(2):1240-1245

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Biomarkers and adamantanes in crude oils from Cenomanian deposits of northern West Siberia     

V.A. Kashirtsev  I.I. Nesterov  V.N. Melenevskii  E.A. Fursenko  M.O. Kazakov  A.V. Lavrenov 《Russian Geology and Geophysics》2013,54(8):958-965

Chromato-mass-spectrometric studies made it possible to identify a wide spectrum of hydrocarbon biomarkers in crude oils from Cenomanian pools of northern West Siberia (Russkoe, Pangodinskoe, Van-Eganskoe, Severo-Komsomol’skoe). The distribution pattern of the main hydrocarbon components (n-alkanes, acyclic isoprenanes, steranes, terpanes) shows that most of the oils underwent intense microbial oxidation. We have established high concentrations of 25-norhopanes typical of high-degree degradation; demethylated hopanes are also revealed in “alkane” crude oils. Among low-molecular chemofossils, bi- and tricyclic mono and sesquiterpanes have been recognized, whose precursors are usually biomolecules synthesized by plants. Unsaturated precursors of mono and sesquiterpanes might have been the starting material for thermocatalytical synthesis of framework adamantanoid structures, whose high concentrations have been found in alkane-free crude oils.  相似文献   

Numerical modeling of plastic deformation and failure around a wellbore in compaction and dilation modes     

Aboozar Garavand  Yuri Pavlovich Stefanov  Yuri Leonidovich Rebetsky  Rustam Alfredovich Bakeev  Artem Veniaminovich Myasnikov 《国际地质力学数值与分析法杂志》2020,44(6):823-850

In many wellbore stability analyses, the ability to forecast both the occurrence and extent of plastic deformation and failure hinges upon a fundamental understanding of deformation mode and failure mechanism in the reservoir rock. This study focuses on analyzing plastic zones, localized deformations, and failures around a borehole drilled overbalanced or underbalanced through a highly porous rock formation. Based on several laboratory experiments, porous rocks are prone to deform under both shear-induced dilation and shear-enhanced compaction mechanisms depending on the stress state. The shapes of the deformation and failure patterns around the borehole are shown, depending on the initial stress state and the local stress paths. The inquiry of the local stress paths in the near-wellbore zone facilitates the understanding of the reasons for different types of failure mechanisms, including the mixed-mode and the plastic deformation structures. The modification of the 2D plane strain condition by imitating third stress in the numerical scheme helps us bring the stress paths closer to the real state of loading conditions. Our modeling reveals that the transition from isotropic to anisotropic stress state is accompanied by an increase in the deviatoric part of effective shear tensor that leads to the development of inelastic deformation, degradation, and subsequent rock failure. Particular interest is devoted to the modeling of strain localization especially in compaction mode around a wellbore and computing the amount of stress concentration at the tips of dog-eared breakouts. Stress concentration can result in a change in irreversible deformation mode from dilatancy to compaction, elucidating the formation of the shear-enhanced compaction phenomenon at the failure tips in the direction of the minimum horizontal stress.  相似文献   

Explosive cyclogenesis in the northeastern part of the Atlantic Ocean   总被引：1，自引：0，他引：1  

E. S. Nesterov 《Russian Meteorology and Hydrology》2010,35(10):680-686

The formation conditions of 21 explosive cyclone in the northeastern part of the Atlantic Ocean in 1986–1999 are analyzed. The typical values are determined of some characteristics of the atmosphere and ocean accompanying the explosive cyclogenesis: North Atlantic Oscillation and East Atlantic Oscillation indices, air and water temperature, sensible and latent heat fluxes.  相似文献   

Extreme waves in the North Atlantic     

E. S. Nesterov  A. A. Lukin 《Russian Meteorology and Hydrology》2012,37(11-12):728-734

Analyzed are the reasons of extreme waves with the height of more than 14 m formed in the North Atlantic in 2002–2011 and the evolution of atmospheric processes causing the extreme waves. It is revealed that the extreme waves in the North Atlantic during that period were mainly (in 81% of cases) formed under the influence of “explosive” cyclones. The height of waves in these cyclones can reach 20 m and more.  相似文献   

Morphometric Features of the Submarine Slope of the Southwestern Part of Valaam Island     

Naumenko  M. A.  Guzivaty  V. V.  Nesterov  N. A.  Sybetto  D. A. 《Doklady Earth Sciences》2019,486(1):585-587

Doklady Earth Sciences - A digital bathymetric model with a 10 × 10 m spatial resolution was created on the basis of the depth sounding on the southwestern slope of Valaam Island with the use...  相似文献   

WSRT observations of the quasar OH 471     

N. S. Nesterov  A. E. Volvach  S. V. Pogrebenko 《Astronomy Letters》2002,28(10):656-659

The 325-MHz observations of the quasar OH 471 (z=3.4) in 1985–1996 revealed variability of its radio emission. Over this period, its radio flux density increased by a factor of 1.6. A steep-spectrum radio source was identified $2_.^\prime 5$ north of the quasar. Its radio flux density is 1.46 mJy at 5 GHz and 14.5 mJy at 350 MHz.  相似文献   

Dynamics of the coastal zone of the Kuibyshev and Saratov reservoirs in the Tolyatti area and its correlation with the operation regime of the Zhigulevskaya HPP     

A. V. Kotlyakov  E. M. Shumakova  S. A. Artem’ev 《Water Resources》2007,34(6):657-662

The negative effect of vibrations of the spillway dam of the Zhigulevskaya HPP on the oscillations of soils and shore deformations near Tolyatti Town is demonstrated on the basis of field observational data.  相似文献   

A geophysical survey of the Spitsbergen Margin and surrounding areas     

Dmitry Baturin  Tatiana Fedukhina  Leo Savostin  Artem Yunov 《Marine Geophysical Researches》1994,16(6):463-484

New geophysical information including multichannel seismic profiling data obtained by the PGO Sevmorgeologia Ministry of Geology of the former USSR, Murmansk during 1984–1988 is discussed and interpreted in this study. The deep structure, sedimentary cover and stratigraphy of the Spitsbergen Continental Margin, considered to be a passive margin, i.e. divergent in the northern part and strike-slip in the western part, is described.Two genetically different types of plateaus on the continental margin, Yermak in the north and Spitsbergen (Vestnesa) in the west, have been identified.The entire extent of the continental slope of the northern part of the Spitsbergen Continental Margin in the Eurasia Basin is underlain by attenuated continental crust, while at the base of the Southwest Continental Margin, the oceanic crust along almost the entire extent is observed. The sedimentary cover, up to 10 km thick within the West Spitsbergen Continental Margin, is likewise observed. Within the North Spitsbergen Margin, however, it does not exceed 3.5 km in thickness.The extension and deposition within the West Spitsbergen Margin began in early Oligocene, while the rifting with accompanying sedimentation within the North Spitsbergen Continental Margin started probably in Early Cretaceous.  相似文献