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1.
Long-term observational data (1992?C2009) on heavy metal (Cu, Zn, Pb, Cr, Ni, V, Mo, Co, Fe, and Mn) content of different links in the Ivankovo Reservoir ecosystem are used to consider the regularities in the distribution and behavior of heavy metals in the system anthropogenic pollution sources-reservoir and its drainage area, thus enabling the assessment of the pollution level of the Volga Source of water supply to Moscow. 相似文献
2.
The results of studying the composition of hydrocarbon gases (C1–C5) and organic matter in bottom sediments of the Ivankovo Reservoir in 1995, 2004, and 2005 are given. The methods used in the study include vapor-phase gas chromatography, instrumental pyrolysis gas chromatography, and mass-spectrometry for determining organic carbon δ 13Corg. The gas field of bottom sediments in different regions of the reservoir varies widely in terms of gas saturation and the spectrum of hydrocarbon gases. This suggests the heterogeneous composition of organic matter in the sediments and different conditions of its input and transformation processes. The gases were found to contain saturated hydrocarbons from methane to pentane C1–C5, including isomers i-C4 and i-C5 and unsaturated compounds C2–C4. A correlation was found to exist between methane distribution and the distribution of its more high-molecular homologues, which confirms their genetic relationship in bottom sediments. The obtained results show an increase in the rate of microbiological processes and organic matter transformation for most regions in the Ivankovo Reservoir. The only exceptions are the zones of Moshkovichskii Bay and the sections at Gorodnya and Konakovo, where technogenic organic matter is being accumulated. The high information value of hydrocarbon gases as biogeochemical markers of the sources of organic matter and the rates of its transformation is demonstrated. The isotopic composition of organic-matter carbon in the bottom sediments of the Ivankovo Reservoir δ 13C varies from ?26.21 to ?30.86‰. 相似文献
3.
The processes of formation and distribution of the resources of fresh groundwater and surface water in the territory of Crimea Peninsula are considered. Water availability in the natural–historic and administrative regions of the republic is characterized. The proportions between different categories of groundwater resources are shown with their role in water supply to Crimea taken into account. The presentday development of groundwater resources is analyzed and the possible increase in water consumption meeting geoecological requirements is substantiated. 相似文献
4.
Dzhamalov R. G. Reshetnyak O. S. Safronova T. I. Myagkova K. G. Vlasov K. G. 《Water Resources》2018,45(2):35-43
Water Resources - The present-day conditions of the formation and distribution of the water resources and chemistry under global warming during the recent decades have been considered. The... 相似文献
5.
Dzhamalov R. G. Vlasov K. G. Myagkova K. G. Reshetnyak O. S. Safronova T. I. 《Water Resources》2019,46(1):S74-S84
Water Resources - The space–time variations in the Oka basin water chemistry have been considered. The specific features in the river water and groundwater pollution along the Oka channel and... 相似文献
6.
Late Pliocene–early Pleistocene deep‐sea basin sedimentation at high‐latitudes: mega‐scale submarine slides of the north‐western Barents Sea margin prior to the shelf‐edge glaciations 
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下载免费PDF全文 P. A. Safronova J. S. Laberg K. Andreassen V. Shlykova S. Chernikov 《Basin Research》2017,29(Z1):537-555
At high‐latitude continental margins, large‐scale submarine sliding has been an important process for deep‐sea sediment transfer during glacial and interglacial periods. Little is, however, known about the importance of this process prior to the arrival of the ice sheet on the continental shelf. Based on new two‐dimensional seismic data from the NW Barents Sea continental margin, this study documents the presence of thick and regionally extensive submarine slides formed between 2.7 and 2.1 Ma, before shelf‐edge glaciation. The largest submarine slide, located in the northern part of the Storfjorden Trough Mouth Fan (TMF), left a scar and is characterized by an at least 870‐m‐thick interval of chaotic to reflection‐free seismic facies interpreted as debrites. The full extent of this slide debrite 1 is yet unknown but it has a mapped areal distribution of at least 10.7 × 103 km2 and it involved >4.1 × 103 km3 of sediments. It remobilized a larger sediment volume than one of the largest exposed submarine slides in the world – the Storegga Slide in the Norwegian Sea. In the southern part of the Storfjorden TMF and along the Kveithola TMF, the seismic data reveal at least four large‐scale slide debrites, characterized by seismic facies similar to the slide debrite 1. Each of them is ca. 295‐m thick, covers an area of at least 7.04 × 103 km2 and involved 1.1 × 103 km3 of sediments. These five submarine slide debrites represent approximately one quarter of the total volume of sediments deposited during the time 2.7–1.5 Ma along the NW Barents Sea. The preconditioning factors for submarine sliding in this area probably included deposition at high sedimentation rate, some of which may have occurred in periods of low eustatic sea‐level. Intervals of weak contouritic sediments might also have contributed to the instability of part of the slope succession as these deposits are known from other parts of the Norwegian margin and elsewhere to have the potential to act as weak layers. Triggering was probably caused by seismicity associated with the nearby and active Knipovich spreading ridge and/or the old tectonic lineaments within the Spitsbergen Shear Zone. This seismicity is inferred to be the main influence of the large‐scale sliding in this area as this and previous studies have documented that sliding have occurred independently of climatic variations, i.e. both before and during the period of ice sheets repeatedly covering the continental shelf. 相似文献
7.
Kocharyan A. G. Venitsianov E. V. Safronova N. S. Seren'kaya E. P. 《Water Resources》2003,30(4):404-412
Seasonal dynamics of total concentrations and the main forms of occurrence of heavy metals (HM) in the water mass and bottom deposits (BD) are studied in the Priplotinnyi (Near-dam) Pool of the Kuibyshev Reservoir. In the near-bottom and interstitial waters, heavy metals are mostly found in the form of complex compounds with organic and mineral ligands; the proportions of these complexes and the dominant form in the above media change from season to season. The hard skeleton of bottom deposits contains a large store of heavy metals that can be a source of the secondary pollution of water masses. 相似文献
8.
Ten-year dynamics of pollutant input from point and non-point sources in the Ivan'kovo Reservoir basin is analyzed. The shares of input components of the water balance in the anthropogenic load on the water body are specified. Data confirming the effect of significant reduction in pollutant input on the reservoir water quality, bottom sediments, and biota are presented. 相似文献
9.
R. G. Dzhamalov N. L. Frolova G. N. Krichevets T. I. Safronova M. B. Kireeva M. I. Igonina 《Water Resources》2012,39(6):623-639
Variations in the characteristics of the annual, dry-season, and minimal monthly runoff in rivers of European Russia for the recent 35 years (1975?C2005) have been estimated and analyzed in comparison with a period of approximately the same duration (1935?C1969). The genesis of runoff for different river basins and the major causes of current changes in runoff characteristics have been studied. Regional regularities in the hydrological and geohydrological processes have been identified, and zoning of the territory has been performed with identification of specific features in the formation of river runoff in the European North and the basins of the Volga, Don, Ural, etc. The natural resources of surface and subsurface waters over 1970?C2005 have been re-estimated with the construction of appropriate maps. Water availability and load on water resources have been analyzed. 相似文献
10.
The natural-climatic causes of changes in river runoff and seasonal recharge of groundwater in Don basin are considered. Joint
analysis is made of changes in the statistical characteristics of the series of air temperature and precipitation, mean annual
and dry-season-averaged runoff for both the entire observation period and of periods 1940–1969 and 1970–2000 with comparable
durations. The presence of statistically reliable ascending trends in air temperature, precipitation, and dry-season (groundwater)
runoff for period 1970–2005 is demonstrated. Climatic changes in Don basin also have their effect on the formation of extremely
low water in small and medium rivers, including cases of zero runoff. Zoning of the territory by runoff formation conditions
is carried out, and new estimates of natural groundwater resources in Don basin for period 1970–2000 are constructed. Appropriate
maps are compiled. 相似文献