Hydrological and morphological processes at river mouths of the Caspian Sea Region as possible analogs of expected changes of mouths of other rivers in Russia and the world     

V. N. Mikhailov  M. V. Mikhailova  M. V. Isupova 《Water Resources》2014,41(5):489-504

Present changes in the regime and structure of mouths of rivers, which empty into the Caspian Sea, are discussed. The similarities and differences of these processes at the mouths of different rivers of the Caspian Region were revealed. Assessment was made of the impact of changes in river water runoff and sediment load and in the Caspian Sea level as well as the nearshore zone relief and local hydraulic engineering activities on the processes under study. Anomalous features of the processes occurring at the mouths of the Volga and Terek rivers were revealed and explained. Hydrological and morphological processes typical of the present mouths of the rivers of Ural, Sulak, and Kura were revealed; these processes could be accepted as universal and possible analogs in assessing the expected changes at the mouths of other rivers in Russia and the world in the XXI century.  相似文献   

Ammonites from the <Emphasis Type="Italic">Deshayesites</Emphasis> genus from Aptian (Lower Cretaceous) sediments in the Mountainous Crimea     

I. A. Mikhailova  E. Yu. Baraboshkin 《Moscow University Geology Bulletin》2009,64(1):29-34

Stratigraphically important ammonites Deshayesites ex gr. deshayesi (d’Orbigny, 1840), Deshayesites sp. juv., and Paradeshayesites aff. callidiscus [Casey, 1961] from lower Aptian pelagic sediments at the Verkhorech’e Village have been described and depicted. The new finds and revision of previously found ammonites allow the recognition of ammonite zones Deshayesites volgensis and Deshayesites deshayesi in the Southwestern Crimea.  相似文献   

Crystal Chemistry of Pyroaurite from the Kovdor Pluton,Kola Peninsula,Russia, and the Långban Fe–Mn deposit,Värmland,Sweden     

E. S. Zhitova  G. Yu. Ivanyuk  S. V. Krivovichev  V. N. Yakovenchuk  Ya. A. Pakhomovsky  Yu. A. Mikhailova 《Geology of Ore Deposits》2017,59(7):652-661

Pyroaurite [Mg₆Fe₂³⁺ (OH)₁₆][(CO₃)(H₂O)] from the Kovdor Pluton on the Kola Peninsula, Russia, and the Långban deposit in Filipstad, Värmland, Sweden were studied with single crystal and powder X-ray diffraction, an electron microprobe, and Raman spectroscopy. Both samples are rhombohedral, space group R3?m, a = 3.126(3), c = 23.52(2) Å (Kovdor), and a = 3.1007(9), c = 23.34(1) (Långban). The powder XRD revealed only the 3R polytype. The ratio of di- and trivalent cations M²⁺: M³⁺ was determined as ~3.1–3.2 (Kovdor) and ~3.0 (Långban). The Raman spectroscopy of the Kovdor sample verified hydroxyl groups and/or water molecules in the mineral (absorption bands in the region of 3600–3500 cm^–1) and carbonate groups (absorption bands in the region of 1346–1058 cm^–1). Based on the data obtained, the studied samples should be identified as pyroaurite-3R (hydrotalcite group).  相似文献   

Deltas as Indicators of Natural and Human-Induced Changes in the Regimes of Rivers and Seas     

Mikhailov  V. N.  Mikhailova  M. V. 《Water Resources》2003,30(6):602-612

The way in which the joint action of fluvial and marine factors control delta formation is illustrated by examples of the mouths of rivers discharging into the Black and Mediterranean seas. The processes of active delta out-building under the effect of cold, wet climatic conditions and human-induced erosion in river basins and the processes of sea-wave erosion of deltas under the effect of a significant decrease in the sediment discharge of rivers that was caused by impact of human activities in the second half of the 20th century are discussed.  相似文献   

VI Conference “Dynamics and Thermal Conditions of Rivers,Reservoirs, and Coastal Zone of Seas”     

V. K. Debolskii  M. V. Mikhailova 《Water Resources》2005,32(5):582-585

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Relationships between the kinematics of the top of a layer and the state of stress within it due to block motion at its base-connections with interpretation of recent movements     

A.S. Grigoryev  I.M. Volovich  A.V. Mikhailova  Yu.L. Rebetsky  Z.E. Shakhmuradova 《Journal of Geodynamics》1988,9(2-4)

The equilibrium of an infinite linearly viscous layer overlying a rigid basement which is separated into blocks by a narrow plane slit is considered. The state of stress in the layer is caused by slow translational motions of the basement blocks. This spatial problem is shown to separate into problems of plane and anti-plane strain; their solutions are constructed in analytic form. The theoretical study was accompanied by modelling experiments. The results are applied to a kinematic interpretation of recent movements in sediments.  相似文献   

Minerals of zirconolite group from fenitized xenoliths in nepheline syenites of Khibiny and Lovozero plutons,Kola Peninsula     

Yu. P. Menshikov  Yu. A. Mikhailova  Ya. A. Pakhomovsky  V. N. Yakovenchuk  G. Yu. Ivanyuk 《Geology of Ore Deposits》2015,57(7):591-599

Zirconolite, its Ce-, Nd-, and Y-analogs, and laachite, another member of the zirconolite group, are typomorphic minerals of the fenitized xenoliths in nepheline syenite and foidolite of the Khibiny–Lovozero Complex, Kola Peninsula, Russia. All these minerals are formed at the late stage of fenitization as products of ilmentie alteration under the effect of Zr-bearing fluids. The diversity of these minerals is caused by the chemical substitutions of Na and Ca for REE, Th, and U compensated by substitution of Ti and Zr for Nb, Fe and Ta, as well as by the redistribution of REE between varieties enriched in Ti (HREE) or Nb (LREE). The results obtained can be used in the synthesis of Synroc-type titanate ceramics assigned for the immobilization of actinides.  相似文献   

Modeling of Thermal and Oxygen Conditions in Lake Kinneret (Israel)     

Ivanov  V. A.  Lyubartseva  S. P.  Mikhailova  É. N.  Shapiro  N. B.  Shteinman  B. S. 《Physical Oceanography》2002,12(1):43-53

Within the framework of a one-dimensional model taking into account the presence of an upper mixed layer, we compute the seasonal variation of temperature and the concentration of dissolved oxygen in the central part of Lake Kinneret. The temperature conditions of the lake are determined by heat exchange with the atmosphere, and the oxygen conditions depend on gas exchange with the atmosphere and oxygen consumption in sediments as well as on internal sources and sinks. The latter are connected with oxygen supply in the course of photosynthesis and its consumption for the oxidation of labile organic substance in the water thickness. In the period of winter convection from December to February, when the upper mixed layer reaches the bottom, complete aeration of water takes place. The presence of thermal stratification of the lake in the remaining time results in oxygen deficiency under the thermocline.  相似文献   

Modelling of circulation in the Gulf of Izmir     

V. A. Ivanov  A. I. Kubryakov  E. N. Mikhailova  N. B. Shapiro 《Physical Oceanography》1997,8(1):47-55

Through numerical modelling, the paper studies water circulation in the Gulf of Izmir. To this end, a multilevel model is applied based on the primitive hydrodynamics equations. The calculations allow to describe the structure of circulation under various wind conditions. Physical mechanisms are scrutinized, controlling water circulation in the Gulf of Izmir. Translated by Vladimir A. Puchkin.  相似文献   

Modelling of wind currents in the Donuzlav lake     

A. I. Androsovich  V. A. Ivanov  E. N. Mikhailova  N. B. Shapiro 《Physical Oceanography》1997,8(2):81-91

A barotropic variant of a multilevel numerical model based on primitive equations of sea dynamics is applied to calculate wind-induced circulation in the Donuzlav lake. Water exchange with the open sea is considered. The paper examines several situations involving wind forcing. It shows that a two-layer system of currents occurs in the lake. The effect of the bottom topography is essential, being traceable up to the surface. Translated by Vladimir A. Puchkin.  相似文献