The effect of tributaries on the environmental conditions in the Enisei River     

A. D. Aponasenko  V. V. Dryukker  L. M. Sorokovikova  L. A. Shchur 《Water Resources》2010,37(6):817-824

Multidisciplinary studies carried out in 2007–2008 revealed the features of concentration dynamics of biogenic and organic substances, bacterio- and phytoplankton, and chlorophyll in different reaches of the Enisei River. By the development state of bacterio- and phytoplankton, saprobity index, total primary production g O₂/(m² day), and self-purification index, the water refers to the third quality class (satisfactorily clean), β-mesosaprobic. The Enisei refers to the oligotrophic type upstream of the Angara mouth and to the mesotrophic type downstream of it.  相似文献   

The status of the aquatic ecosystem of the Selenga river delta under long-duration low-water conditions     

L. M. Sorokovikova  V. N. Sinyukovich  I. V. Tomberg  G. I. Popovskaya  M. S. Chernyshev  V. G. Ivanov  T. V. Khodzher 《Geography and Natural Resources》2017,38(1):60-67

We examine the ecological aspects concerning the status of the surface waters in the delta of the Selenga river for the low-water conditions which have been observed since 1996. The ongoing changes in the most important indicators of the status of the waters in the river delta are assessed on the basis of results of hydrological, hydrochemical and hydrobiological investigations made by these authors in 2013–2015 and with consideration for earlier research efforts. It is established that the low-water conditions resulted in a decrease of the role of the main delta branches, Kharauz and Levoberezhnaya, in streamflow. An increase in the contribution of groundwater in the alimentation of the river led to an increase in concentrations of main ions: for the current low-water period their total content has varied from 119 to 780 mg/L, with a maximum in small delta branches in the wintertime. Changes in concentrations of biogenic elements were recorded: total phosphorus from 10 to 190 μg P/L, mineral phosphorus from 0 to 35 μg P/L, and nitrate nitrogen from 0.01 to 0.81 μg N/L. A minimum of mineral phosphorus compounds and nitrogen was observed at the time of mass development of algae. It is established that the dynamics of organic matter content is determined by changes in hydraulicity, and by the intensity of phytoplankton development. Within the long-term context, a deterioration of water regime and vegetation infill and swamping of shallow delta branches were recorded. The development level of the phytoplankton and changes in its structure point to a progressive eutrophication of the Selenga waters. According to the value of the saprobic index, the quality of the Selenga waters corresponds largely to the category of “moderately polluted” waters (class II and III), and it decreases at low-water periods, especially in shallow delta branches with a high population of cryptophytic algae, to the category of “polluted” waters.  相似文献   

Concentration dynamics of biogenic elements and phytoplankton at Selenga R. Mouth and in Selenga shallows (Lake Baikal)     

I. V. Tomberg  L. M. Sorokovikova  G. I. Popovskaya  N. V. Bashenkhaeva  V. N. Sinyukovich  V. G. Ivanov 《Water Resources》2014,41(6):687-695

The seasonal and year-to-year dynamics of the concentrations of biogenic elements and organic matter, as well as quantitative composition of phytoplankton in water of Selenga delta branches is studied. The distribution of those components from the mouth of the Kharauz branch (the main branch) to the water area of the Selenga shallows in different hydrological seasons is shown. The concentrations of nitrate nitrogen and phosphate phosphorus in the zone of mixing of river and lake waters have been found to drop by 30 and 50%, respectively, because of the consumption of those substances by phytoplankton.  相似文献   

Use of the regional non-hydrostatic model for determining meteorological variables in forecasting radionuclides propagation and fallout     

K. G. Rubinshtein  R. Yu. Ignatov  E. V. Nabokova  R. V. Arutyunyan  V. N. Semenov  O. S. Sorokovikova  A. I. Fokin 《Russian Meteorology and Hydrology》2009,34(8):501-509

The first stage of works on coupling the regional hydro-dynamical model of meteorological field predictions and software for the radioactive situation predictions (NOSTRADAMUS) used for the operational forecasting of the radioactive species propagation to tens and hundreds kilometers is described. Results of the experiments with the different parametrizations of the boundary layer are presented. It is shown that the best predictions of the wind characteristics were obtained by using the Pleim-Chang parametrization (PCP) of the boundary layer [17]. In spite of that the characteristics of precipitation are simulated slightly better in the Eta parametrization, the observed underestimation of the precipitation estimates compared with those for PCP is insignificant and, thus, the latter can be preferred for further work.  相似文献   

Identification of toxigenic Cyanobacteria of the genus Microcystis in the Curonian Lagoon (Baltic Sea)     

O. I. Belykh  O. A. Dmitrieva  A. S. Gladkikh  E. G. Sorokovikova 《Oceanology》2013,53(1):71-79

In 2002–2008, seasonal (April–November) monitoring of the phytoplankton in the Russian part of the Curonian Lagoon at five fixed sites was performed. A total of 91 Cyanobacteria, 100 Bacillariophyta, 280 Chlorophyta, 21 Cryptophyta, and 24 Dinophyta species were found. Six potentially toxic species of cyanobacteria: Aphanizomenon flos-aquae, Anabaena sp., Microcystis aeruginosa, M. viridis, M. wesenbergii, and Planktothrix agardhii dominated the phytoplankton biomass and caused water blooms. The seasonal average phytoplankton biomass ranged from 30 to 137 g/m³. The cyanobacteria’s biomass varied from 10 to 113 g/m³ forming 30–82% of the total with a mean of 50%. With the aid of genetic markers (microcystin (mcy) and nodularin synthetases), six variants of the microcystin-producing gene mcyE from the genus Microcystis were identified. Due to the intensive and lengthy blooms of potentially toxic and toxigenic cyanobacteria, the environmental conditions in the Curonian Lagoon appear unfavorable. The water should be monitored for cyanotoxins with analytical methods in order to determine if the area is safe for recreational use.  相似文献   

Water chemistry and phytoplankton in water bodies in the Selenga River’s delta under ice cover     

L. M. Sorokovikova  G. I. Popovskaya  V. N. Sinyukovich  I. V. Tomberg  N. V. Bashenkhaeva  N. A. Tashlykova 《Water Resources》2006,33(3):321-328

Results of comprehensive studies that were carried out during freezing period in the lower reaches of the Selenga River and in water bodies located within its delta revealed peculiarities of water chemistry, phytoplankton species composition, and the characteristic features of alga development. Quantitative assessment of algae is also presented.  相似文献   

Formation of the Ion Composition of the Barguzin River Waters (Lake Baikal Basin) under the Conditions of Saline Landscapes     

Sinyukovich  V. N.  Shiretorova  V. G.  Tomberg  I. V.  Sorokovikova  L. M.  Radnaeva  L. D.  Tulokhonov  A. K. 《Doklady Earth Sciences》2020,495(1):858-861

Doklady Earth Sciences - The results of measuring the ion composition of the Barguzin River waters during periods of different water contents and assessments of hydrological factors of water flow...  相似文献   

Oil Products in Lake Baikal and Its Tributaries     

Marinaite  I. I.  Sorokovikova  L. M.  Sinyukovich  V. N.  Zhuchenko  N. A.  Onishchuk  N. A.  Tomberg  I. V. 《Water Resources》2022,49(3):458-466

Water Resources - The results of studying present-day oil product concentrations in water of Baikal and its tributaries are given. The highest concentrations of oil products have been identified in...  相似文献   

Software package of atmospheric radionuclide distribution models and its use for assessing the radiation conditions after the Fukushima Dai-ichi nuclear power plant accident     

K. G. Rubinshtein  E. M. Nabokova  R. Yu. Ignatov  M. M. Smirnova  R. V. Arutyunyan  V. N. Semenov  O. S. Sorokovikova  A. V. Fokin  D. A. Pripachkin  D. V. Dzama 《Russian Meteorology and Hydrology》2012,37(9):586-597

Described is the process of trial, adjustment, and development of the joint complex of models consisting of the WRF-ARW (Weather Research and Forecasting) regional hydrodynamic model (the United States) and radionuclide transport model from the NOSTRADAMUS package. Using these models, the computation is carried out of the fallout and radiation dose rate on the territory of Japan after the Fukushima nuclear power plant accident. To adjust the hydrodynamic model, its results were preliminarily compared with the data of observations at the mast and the assessment of the model complex was based on the data of atmospheric tracer concentration measurements during the in situ experiments carried out in 1983?C1985 near Karlsruhe (Germany). Described is the version of hydrodynamic prognostic model and radionuclide transport model prepared for the present paper. Given are the results of the statistical analysis of different numerical experiments of the model complex and the results of the simulation of radiation conditions on the territory of Japan after the Fukushima Dai-ichi nuclear power plant accident. It is demonstrated that the errors in the vertical distribution of the model wind are extremely sensitive to the type of parameterization of surface and boundary layers in the model. The comparison of computed and measured values demonstrated their satisfactory coincidence.  相似文献