Numerical model and calculation of the water circulation in the north-western Black Sea     

A. I. Androsovich  E. N. Mikhailova  N. B. Shapiro 《Physical Oceanography》1995,6(5):351-364

A multilevel model based on primitive equations and a monotonic finite-difference scheme is applied to study the fluid dynamics over the north-western Black Sea shelf. Wind-generated currents and currents induced by river discharge are simulated in terms of the barotropic version. The effects of the bottom topography, the rigid-lid approximation, and the interaction of wind and river discharge-induced flows are examined.Translated by Vladimir A. Puchkin.  相似文献   

Simulation of the Circulation and Space Structure of Thermohaline Fields in the Sevastopol Bay with Regard for the Actual External Data (Winter, 1997)     

E. N. Mikhailova  N. B. Shapiro 《Physical Oceanography》2005,15(2):118-132

We discuss the results of the numerical experiment aimed at the simulation of the behavior of currents and transformations of the temperature and salt modes in the Sevastopol Bay in January–February 1997. In the numerical analysis, we use actual data on the velocity and direction of the wind, sea surface temperature, and the discharge of River Chernaya. It is shown that the circulation and structure of hydrological fields are mainly connected with the direction of the wind, its intensity, and variability in the course of time. Since the analyzed water area is shallow, the currents inside the bay undergo rapid transformations (less than for an hour after changes in the wind). At the same time, the transformations of the thermohaline fields are slower. Due to the inflow of fresh waters of River Chernaya and salt waters from the open sea through the strait, the structure of thermohaline fields formed in the bay is nonuniform (both in the vertical and horizontal directions). The distribution of salinity plays the main role in the formation of the vertical stratification, which is natural for the winter season. Due to the process of freshening of water, a quite high vertical salinity gradient is formed in the upper layer of the sea. As a result, the process of cooling does not lead to the appearance of convection and inversions of temperature are formed in the case where warmer waters are located in the bottom layers. __________ Translated from Morskoi Gidrofizicheskii Zhurnal, No. 2, pp. 60–76, March–April, 2005.  相似文献   

Power spectra of thermal tidal and planetary waves in the near-Earth atmosphere and in the ionospheric D region at Kamchatka     

G. A. Mikhailova  Yu. M. Mikhailov  O. V. Kapustina  G. I. Druzhin  S. E. Smirnov 《Geomagnetism and Aeronomy》2009,49(5):610-623

Spectral analysis of the diurnal variations in the quasi-static electric field in the near-Earth atmosphere and VLF atmospheric radio noise at a frequency of 5.3 kHz, simultaneously observed in September–October 1999 at Paratunka observatory of the Institute of Cosmophysical Research and Radiowave Propagation, has been performed. The variations in the intensities of the spectral power density and the period durations of the variations in the T ～ 8–24 h band and higher as functions of geomagnetic and seismic activities have been studied.  相似文献   

Hydrological processes at an Arctic river mouth: Case study of the Colville River, Alaska, USA     

M. V. Mikhailova 《Water Resources》2009,36(1):26-42

Data on the Colville River mouth (Alaska, USA) are used to discuss the regularities in hydrological processes taking place in river mouth areas, functioning under extreme arctic conditions. Seasons and periods are recognized in the annual cycle of the Colville river mouth hydrologic regime. A thick ice cover commonly forms in winter in the river, its delta distributaries, and the offshore zone. Water salinity in under-ice water in the distributaries and near-delta river reach appreciably increases in late winter. The spring flood is very short; in this period, snowmelt water propagates toward the ocean first over ice and next under it. A wedge of freshened waters forms in the nearshore zone above fast ice. River runoff abruptly drops in the summer-autumn low-water period. The morphological processes in the distributaries and some ecological conditions in the delta are also discussed.  相似文献   

Variations of Trends in Delta Development under the Effect of External Natural and Anthropogenic Factors: Case Study of the Modern Huang He Mouth     

V. N. Mikhailov  V. I. Kravtsova  A. N. Inyushin  M. V. Mikhailova 《Water Resources》2018,45(4):466-478

The paper considers the major geographic features of the modern Huang He delta, which ranks among the most rapidly varying in the world. The structure of the hydrographic network and the combination of the natural and anthropogenic geosystems of the delta are characterized. The major external riverine and marine, as well as local anthropogenic factors that have affected the development of the Huang He delta in the recent half century are identified. The regularities of the jump-like development of the Huang He delta in the XIX–early XXI centuries are considered. Special attention is paid to the development of the delta after the artificial redistribution of flow in its boundaries in 1996. Satellite images and methods of their interpretation improved by the authors were used. The trends in Huang He delta development are shown to have changed since the last quarter of the XX century under the effect of an abrupt decrease in river sediment load and the growing impact of marine factors. The active progradation of the delta into the sea slowed down significantly, accompanied by erosion and retreat in many segments of its coastline. Huang He delta was used to establish the conditions of changes in the development trends of other deltas under the effect of changes in the climate and economic activity.  相似文献   

Seismicity of the North of the Russian Plate: Relocation of Recent Earthquakese     

A. N. Morozov  N. V. Vaganova  V. E. Asming  Ya. A. Mikhailova 《Izvestiya Physics of the Solid Earth》2018,54(2):292-309

The hypocenters of the earthquakes recorded in the north of the Russian Plate from 1982 to 2013 are relocated. The relocation of the hypocenters is based on the common velocity section, common methodology, and the entire set of the initial data and bulletins available from the Russian and foreign seismic stations. The efficiency of the algorithm for calculating the hypocentral parameters and the velocity section is demonstrated by the example of two nonmilitary nuclear explosions in July 18, 1985 and September 6, 1988 in the northern part of the European Russia. For the first time, two earthquakes of July 19, 1982 and October 7, 2012, which have not been previously reported in the catalogs for the north of the Russian plate, are included in the seismic catalog.  相似文献   

Natural and anthropogenic long-term variations of water runoff and suspended sediment load in the Huanghe river     

V. N. Mikhailov  M. V. Mikhailova 《Water Resources》2017,44(6):793-807

The hydrographic, climate, hydrological, and landscape features of the Huanghe R. Basin are considered. Water runoff and suspended sediment load in the Huanghe R. are shown to have dropped significantly in 1950–2009 under the effect of regional climate changes and economic activity in the basin. Water balance method and the concept of flow transport competency were used to assess the contribution of natural and anthropogenic factors (decline in precipitation, water withdrawal for economic needs, and the effect of reservoirs) to the decrease in river water runoff and suspended sediment load.  相似文献   

Geocryological and Hydrogeological Conditions of the Western Part of Nordenskiold Land (Spitsbergen Archipelago)     

Demidov  N. E.  Borisik  A. L.  Verkulich  S. R.  Wetterich  S.  Gunar  A. Yu.  Demidov  V. E.  Zheltenkova  N. V.  Koshurnikov  A. V.  Mikhailova  V. M.  Nikulina  A. L.  Novikov  A. L.  Savatyugin  L. M.  Sirotkin  A. N.  Terekhov  A. V.  Ugrumov  Yu. V.  Schirrmeister  L. 《Izvestiya Atmospheric and Oceanic Physics》2020,56(11):1376-1400

Izvestiya, Atmospheric and Oceanic Physics - This work summarizes the archived data of geocryological and hydrogeological conditions in the west of Nordenskiold Land on the Spitsbergen Archipelago....  相似文献   

Regularities in the Spasmodic Development of Deltas     

Mikhailova  M. V. 《Water Resources》2021,48(6):897-904

Water Resources - Regularities of spasmodic delta formation, a rare type of the process, accompanied by breakthroughs and radical transformations of delta hydrographic network, are discussed. The...  相似文献   

Reconstruction of the space and time variability of thermohaline fields in the Sevastopol Bay     

É. N. Mikhailova  N. B. Shapiro 《Physical Oceanography》2008,18(5):255-271

The aim of the present work is to reconstruct the space and time variability of the three-dimensional fields of currents, temperature, salinity, and density in the Sevastopol Bay under the influence of the actual external factors in 1999. For this purpose, we use a version of the numerical multilayer model on the σ-coordinates. A vast array of the data of observations accumulated as a result of regular monitoring of the Sevastopol Bay contains, in particular, the data on the sea-surface temperature measured with six-hour intervals (at the hydrometeorological station located near the center of the bay) and almost monthly vertical profiles of temperature and salinity obtained at seven hydrological stations. The comparison of the numerical results with the data of observations enables us to conclude that, in general, the model fairly correctly describes the space structure and rearrangements of the fields of temperature and salinity. Among the most important distinctions, we can mention the fact that the fresh river water penetrating into the bay is mixed with seawater faster than predicted by the model. We also discuss the causes of these distinctions. Translated from Morskoi Gidrofizicheskii Zhurnal, No. 5, pp. 23–39, September–October, 2008.  相似文献