Mathematical model for the ecosystem of the Black Sea hydrogen sulphide zone     

V. I. Belyaev  E. E. Sovga 《Physical Oceanography》1992,3(6):455-470

A model for the ecosystem of the Black Sea hydrogen sulphide zone is suggested which incorporates seven components, namely, the concentrations of hydrogen sulphide, oxygen, dead organic matter, thiosulphates, molecular sulphur, and the biomass of sulphate-reducing and thiobacteria. With the minor terms neglected in the equations governing the system under consideration, the latter was divided into subsystems which allow an approximate calculation of the model components' vertical stationary profiles. The derived components' profiles agree qualitatively with available observations.Translated by V. Puchkin.  相似文献   

A comparison of methods for evaluating soil redistribution in the severely eroded Stavropol region, southern European Russia   总被引：3，自引：1，他引：3  

V.R. Belyaev  P.J. Wallbrink  V.N. Golosov  A.S. Murray  A.Yu. Sidorchuk 《Geomorphology》2005,65(3-4):173-193

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Reconstructing the development of a gully in the Upper Kalaus basin,Stavropol region (southern Russia)     

V.R. Belyaev  P.J. Wallbrink  V.N. Golosov  A.S. Murray  A.Yu. Sidorchuk 《地球表面变化过程与地形》2004,29(3):323-341

The Stavropol region of southern Russia is severely affected by human‐induced gully erosion. A lack of detailed information on the different stages of gully formation resulting from major agricultural expansion c. 100 years ago, is an obstacle for management and containment of these systems. In this study we combine measurements of particle‐bound radionuclides (¹³⁷Cs, ²¹⁰Pb_ex, ²²⁶Ra, ²³²Th and ⁴⁰K) and classical geomorphology to investigate and reconstruct the different phases of development of a gully during the last c. 100 years. We believe the ?rst phase (1) involved an initial incision into the bottom of a small valley (catchment area c. 1 km²) about 100 years ago. A short period of rapid growth was followed by a longer stage of gully stabilization. Subsequent phases were: (2) the period 1954–1960 – re‐incision in the lower gully reach was initiated by a high‐magnitude rainfall event, and a substantial amount of sediment was delivered to the gully fan; (3) c. 1960–1986 – the knickpoint retreated slowly, sediment was redeposited nearby, and the fan surface became stable; (4) 1986–1987 – a dam was built in the gully mouth and breached shortly after construction following 2 days of high rainfall, and substantial sediment accumulated in the gully above the dam and below the spillway channel on the fan surface; (5) 1987–1993 – the knickpoint retreat continued and the lower fan surface was stable until 1993 when the last signi?cant runoff event overlayed it with c. 10 cm of fresh sediment. These detailed reconstructions of gully development stages allow the contribution of high‐magnitude events to gully growth and regional sediment delivery to be assessed. They further guide management actions to prevent such dam failures in the future. Copyright © 2004 John Wiley & Sons, Ltd.  相似文献   

Tectonic map of the Vendian–Lower Paleozoic structural stage of the Lena–Tunguska petroleum province,Siberian Platform     

A.E. Kontorovich  S.Yu. Belyaev  A.A. Kontorovich  V.S. Starosel’tsev  M.M. Mandel’baum  A.V. Migurskii  S.A. Moiseev  A.F. Safronov  V.S. Sitnikov  Yu.A. Filiptsov  A.V. Khomenko  Yu.G. Eremin  O.V. Bykova 《Russian Geology and Geophysics》2009,50(8):657-667

A new version of the tectonic map for the Vendian–Lower Paleozoic structural stage of the Lena–Tunguska petroleum province is presented. The map is based on the electronic structure map at a scale of 1:1,000,000, which was the first to be compiled for the uppermost Vendian within the study area. However, no tectonic zonation was made for the deep-buried Meso-Cenozoic Yenisei–Khatanga and Vilyui depressions. The principles and methodology of mapping are given. The study presents spatial, morphological, and quantitative characteristics of the major and large structures.  相似文献   

Comparison of methods for argo drifters data assimilation into a hydrodynamical model of the ocean     

K. P. Belyaev  C. A. S. Tanajura  N. P. Tuchkova 《Oceanology》2012,52(5):593-603

Different data assimilation methods such as an extended Kalman filter, the optimal interpolation method, and a method based on the Fokker-Planck equation applications are considered. Data from the ARGO drifters are assimilated into the HYCOM shallow water model (University of Miami, USA). Throughout the study, the schemes and methods of parallel computations with an MPI library are used. The results of the computations with assimilations are compared between themselves and with independent observations. The method based on the Fokker-Planck equation and the extended Kalman filter are preferable because they give better results than the optimal interpolation scheme. The various model characteristics of the ocean, such as the heat content fields and others, are analyzed after the data assimilation.  相似文献   

Disturbances of the topside ionosphere caused by typhoons     

N. V. Isaev  V. M. Kostin  G. G. Belyaev  O. Ya. Ovcharenko  E. P. Trushkina 《Geomagnetism and Aeronomy》2010,50(2):243-255

The measurements on board the Cosmos-1809 satellite of various parameters of the topside ionosphere plasma during more than ten typhoons in various regions are analyzed. It is shown that specific zones of increased pressure of the electron gas, electric field, and intense ion oscillations are formed during the intensification stage. In some cases the “typhoon eye” is formed over the tropical depression zone in the ionosphere, that is, the region with sharply decreased plasma density and pressure is observed a day and more prior to the moment when it happens in the atmosphere.  相似文献