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1.
L. M. Sorokovikova V. N. Sinyukovich I. V. Tomberg G. I. Popovskaya N. V. Bashenkhaeva N. P. Sez’ko N. A. Zhuchenko 《Geography and Natural Resources》2016,37(3):220-227
Field observations showed that the characteristics of chemical composition of waters and the development of plankton algae in the lakes within the delta of the Selenga river are determined by their flowage. The most open Lake Nekipelovskoe communicates with the Selenga outlets throughout a year, and Lake Zavernyaikha only at the period of an open channel. Lake Semenovskoe and Lake Khlystov Zaton are located in the islands and are isolated from the outlets. According to composition of main ions, the lakes under investigation refer to the hydrocarbonate class, the calcium group. The sum of ions in the water of Lake Nekipelovskoe approaches the one in the Selenga (86?221 mg/dm3), and the highest sums of ions were recorded in the wintertime in the lakes isolated from the outlets (446?743 mg/dm3). The lakes of the delta are characterized by a high trophicity. The maximum concentrations of total phosphorus in Lake Nekipelovskoe and Lake Zavernyaikha were 68 and 122 μg mg/dm3, and in Lake Semenovskoe and Lake Khlystov Zaton ?0.8 and ?0.63 μg mg/dm3, respectively. The most intense development of algae is observed in Lake Zavernyaikha, which is due to the high population of Baikal endemics. Lake Zavernyaikha showed a close negative correlation between the concentration of NO 3 ? , mineral phosphorus and phytoplankton biomass; the correlation coefficient was ?0.8 and ?0.63, respectively. The lakes exhibited increased contents readily hydrolysable organic matter, and a decrease in dissolved oxygen concentration in winter; hydrogen sulfide was repeatedly recorded in Lake Khlystov Zaton. The water quality in the lakes during the springtime varies from “quite clean” to “weakly polluted”; at low-water periods, especially in winters, it can drop to the category of “exceedingly dirty”. The water quality of the Selenga can be influenced by the lakes during spring floods when material accumulated during the wintertime is transported to the river outlets and further to Lake Baikal. 相似文献
2.
L. M. Sorokovikova V. N. Sinyukovich I. V. Tomberg 《Russian Meteorology and Hydrology》2010,35(10):700-705
Changes in chemical runoff of the main tributary of Lake Baikal, the Selenga River, observed since the mid-1990s, and determinant
factors of these changes are under consideration. The estimates derived are indicative of a 20–40% reduction in the annual
removal of dissolved substances because of a decrease in the water runoff of the river due to climate oscillations. The decreased
inflow to Lake Baikal of mineral substances, especially silicon, nitrogen, and phosphorus, can lead to disturbance of production
processes in Lake Baikal. 相似文献
3.
L.M. Sorokovikova V.N. Sinyukovich O.G. Netsvetayeva I.V. Tomberg N.P. Sezko 《Geography and Natural Resources》2009,30(1):35-39
The dynamics of the entry of sulfates and nitrate nitrogen into Lake Baikal together with its influent waters is outlined. Changes in the discharge of chemical components by large water streams are largely determined by the entry of ingredients as part of effluents. It is shown that the current increase in the flow of pollutants from the atmosphere has a dramatic effect on chemical composition of water in small rivers of Southern Baikal with low mineralization. 相似文献
4.
V. V. Parfenova O. N. Pavlova I. A. Terkina M. Yu. Suslova T. Ya. Kostornova I. G. Nikulina V. N. Sinyukovich L. M. Sorokovikova 《Water Resources》2005,32(2):204-208
The distribution and abundance of some groups of saprophytic microorganisms in bottom sediments of Selenga Delta area were investigated. The species composition of 57 strains of the genus Pseudomonas was determined. The distribution of Actinomycetes in sediments was found to be uneven, they were represented by the genera Streptomyces and Micromonospora. Formation of the microbial community in bottom sediments of the investigated area is influenced by the Selenga River.Translated from Vodnye Resursy, Vol. 32, No. 2, 2005, pp. 227–231.Original Russian Text Copyright © 2005 by Parfenova, Pavlova, Terkina, Suslova, Kostornova, Nikulina, Sinyukovich, Sorokovikova. 相似文献
5.
Seasonal variations in water temperature in Selenga Shallow Waters is studied. The contributions of the regimes of waves, river runoff, thermal fronts, and thermobars to the formation of physical structures are assessed. 相似文献
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L. M. Sorokovikova G. I. Popovskaya I. V. Tomberg V. N. Sinyukovich O. S. Kravchenko I. I. Marinaite N. V. Bashenkhaeva T. V. Khodzher 《Russian Meteorology and Hydrology》2013,38(2):126-133
Based on the comprehensive hydrochemical and hydrobiological studies of the Selenga River near the Naushki settlement carried out in 2010, the quality of water flowing from the territory of Mongolia is assessed. The comparison with the results of the previous years indicates that the water quality deteriorated due to the intensification of economic activity in the river basin and unfavorable climatic factors. 相似文献
9.
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
10.
V. N. Sinyukovich N. N. Kurbatova I. A. Chernyavskaya 《Geography and Natural Resources》2011,32(1):54-59
Based on experimental data on the level and elements of the water balance of the Ust’-Ilimsk reservoir, we outline the characteristic
properties of the long-term and seasonal regimes of its impounding and drawdown under normal operation conditions (1977–2008).
We demonstrate the role played by the individual components of water input and output in the formation of the reservoir’s
water regime. 相似文献