Mathematical modeling of barotropic waves in Lake Donuzlav     

V. A. Ivanov  V. V. Fomin  L. V. Cherkesov  T. Ya. Shul’ga 《Physical Oceanography》2006,16(1):28-41

Within the framework of the linear theory, by using numerical methods, we study the free and forced waves in a bounded basin whose geometric characteristics approximately correspond to Lake Donuzlav. The oscillatory motions of the liquid at the exit of the lake are regarded as a driving force. The dependences of the amplitudes of generated waves on the parameters of the driving force are analyzed. __________ Translated from Morskoi Gidrofizicheskii Zhurnal, No. 1, pp. 37–51, January–February, 2005.  相似文献   

Hydrocarbon gases in deposits from mud volcanoes in the Sorokin Trough, north-eastern Black Sea     

V. N. Blinova  M. K. Ivanov  G. Bohrmann 《Geo-Marine Letters》2003,23(3-4):250-257

Hydrocarbon gases were determined in sediments from three mud volcanoes in the Sorokin Trough. In comparison to a reference station outside the mud volcano area, the deposits are characterized by an enrichment of high-molecular hydrocarbons (C₂–C₄), an absence of unsaturated homologues, a predominance of iso-butane in comparison with n-butane, and the presence of gas hydrate. The molecular composition of the hydrocarbon gases suggests their deep sources and thermogenic origin. In the pelagic sediments at the reference station, the methane concentration is relatively low (up to 49 ml/l); maximum concentrations are reached in deposits of the Dvurechenskii mud volcano (up to 400 ml/l). It was the first time that gas hydrate was sampled at the Dvurechenskii mud volcano. The gas extracted by dissociation of hydrate samples was dominated by methane (99.5%) with low amounts of ethane and propane (less than 0.5%). The isotopic composition of the methane varies between –62 and –66 PDB in ¹³C, and between –185 and –209 SMOW in D, indicating a mainly biogenic origin with an admixture of thermogenic gas.  相似文献   

A Model of the Sevastopol'skaya Bay. Reproduction of the Vertical Structure of Temperature and Salinity Fields in 1997–1999     

Ivanov  V. A.  Mikhailova  É. N.  Repetin  L. N.  Shapiro  N. B. 《Physical Oceanography》2003,13(4):201-222

We discuss the results of a numerical experiment carried out within the framework of the most complete one-dimensional (integrated over the horizontal coordinates) version of the quasiisopycnic multilayer model taking into account the processes of diapycnic mass, heat, and salt exchange and the diffusion coefficients chosen according to the theory of double diffusion. The indicated experiment reproduces the vertical thermohaline structure of waters in the Sevastopol'skaya Bay and its variability in 1997–1999. For numerical computations, we use the actual data of meteorological observations and measurements of the discharge of the river Chernaya and the sea level. The comparison of the numerical results with the data of monthly hydrological surveys reveals their good agreement (not only qualitative but also quantitative).  相似文献   

Determination of the evaporation duct height from standard meteorological data   总被引：2，自引：0，他引：2  

V. K. Ivanov  V. N. Shalyapin  Yu. V. Levadnyi 《Izvestiya Atmospheric and Oceanic Physics》2007,43(1):36-44

Four models used for evaluating the height of the evaporation duct from measured atmospheric pressure, water and air temperatures, and air humidity are considered.The calculated results are compared with the duct heights measured during two oceanographic expeditions in the tropical zone of the Atlantic Ocean and the equatorial zone of the Indian Ocean. The sensitivity of models to the errors in the meteorological parameters is investigated. It is shown that, in the case of unstable stratification, the heights of ducts in the 5–20-m range can be evaluated with an error of about 2.5 m. Recommendations for selection of optimal models are given.  相似文献   

Determination of Mesoscale Surface Currents in Shallow-Water Regions According to the Data of High-Frequency Radar Measurements     

L. M. Ivanov  O. V. Mel'nichenko 《Physical Oceanography》2005,15(2):92-104

We propose a new method for the evaluation of the velocities of surface currents according to the data of measurements carried out by using high-frequency land-based radars. The method is based on the representation of the velocity fields via two scalar potentials, expansion of these potentials in series in basis functions, and determination of the coefficients of expansion according to the data of radar measurements as solutions of the corresponding variational problems. The errors of the procedure of determination of the coefficients of expansion are removed by using a special regularization procedure based on information theory. The proposed method enables one to fill gaps in the space and time series of radar measurements. We illustrate the method by an example of numerical analysis of mesoscale and submesoscale (10–50 km) surface currents in the Monterey Bay (California, USA) performed on the basis of the data of radar measurements carried out in August 1994. __________ Translated from Morskoi Gidrofizicheskii Zhurnal, No. 2, pp. 24–36, March–April, 2005.  相似文献   

Internal Waves in the Shelf Zone and near the Shelf Edge in the Black Sea     

Ivanov  V. A.  Lisichenok  A. D. 《Physical Oceanography》2002,12(6):353-360

The data accumulated by a measuring complex equipped with a gradient-distributed temperature sensor in the course of towing in the shelf zone near the South Coast of the Crimea and in the region where the flow of the Rim Current crosses the shelf edge are used to analyze the energy and space characteristics of internal waves formed when the flow runs through the shelf edge and to study the process of their propagation both to the coast and to the open part of the sea.  相似文献   

On the Mechanism of Cyclonic Circulation in Lake Kinneret in Summer     

Shapiro  N. B.  Ivanov  V. A.  Mikhailova  É. N. 《Physical Oceanography》2003,13(1):27-40

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Modeling of wind upwellings on the northwest shelf of the Black Sea near local features of the bottom topography     

V. A. Ivanov  É. N. Mikhailova  N. B. Shapiro 《Physical Oceanography》2008,18(3):168-178

We discuss the results of numerical experiments aimed at the investigation of the process of formation of the three-dimensional structure of the zones of upwelling on the northwest shelf of the Black Sea depending on the direction of the wind. We perform the detailed analysis of three zones (I, II, and III) with fairly well pronounced inhomogeneities of the bottom topography. Zone I is located in the north part of the shelf and, in this region, we observe a narrow depression to the southwest of the Tendrovskaya Spit. In zone II located in the near-Danube zone, we observe a height reaching the sea surface (Zmeinyi Island). Zone III is located in the east part of the shelf and corresponds to a sharp drop of depths with specific curvature of the coastal line of the Kalamitskii Bay and Gerakleiskii Peninsula. The performed analysis enables us to conclude that, in the vicinity of the local features of the bottom topography and coastal line (such as underwater heights, depressions, and capes), we observe the appearance of the zones of upwelling of waters, especially pronounced in the deep-water layers of the sea. __________ Translated from Morskoi Gidrofizicheskii Zhurnal, No. 3, pp. 68–80, May–June, 2008.  相似文献   

Simulation of surge phenomena and transformation of the admixture field in the Sea of Azov in the presence of stationary currents     

V. A. Ivanov  V. V. Fomin  L. V. Cherkesov  T. Ya. Shul’ga 《Physical Oceanography》2008,18(4):212-226

Using a three-dimensional nonlinear mathematical model, we study the processes of transfer and diffusion of contaminants in the Sea of Azov in the presence of stationary currents. Changes in the sea level, surge phenomena, and the direction and velocity of stationary currents caused by winds with different maximum velocities are analyzed. We estimate the region of applicability of the linear approximation and the choice of the value of integration steps over space and time coordinates. It is shown that the growth of the maximum wind velocity increases the contaminated domains and the time of complete dispersion of the admixture. Solutions obtained in the linear approximation differ slightly from those obtained by using the nonlinear model for wind velocities up to 5 m/sec. Translated from Morskoi Gidrofizicheskii Zhurnal, No. 4, pp. 52–68, July–August, 2008.  相似文献   

The Influence of Atmospheric Fronts on Free and Forced Oscillations of the Water Level in the Sea of Azov     

Ivanov  V. A.  Shul’ga  T. Ya. 《Doklady Earth Sciences》2019,486(2):737-740

Doklady Earth Sciences - The influence of inhomogeneous moving atmospheric pressure fields on currents and free and forced oscillations of the level of the Sea of Azov, induced by constant wind, is...  相似文献