Assessment of groundwater inflow in urban territories     

A. Yu. Belyaev  R. G. Dzhamalov  Yu. A. Medovar  I. O. Yushmanov 《Water Resources》2007,34(5):496-500

Analytical and numerical methods are proposed for the calculation of water inflow into construction pits under various geological—engineering and hydrogeological conditions at the construction site. Water inflow into the pit is shown to depend not only on lateral seepage but also on the leakage from underlying aquifers at appropriate parameters of their interaction. Under certain natural conditions, the most efficient method for construction pit draining at low water yield of soils in the construction area are light wellpoint systems, the capacity and layout of which is determined by the potential inflow through the pit contour. The results of analytical and numerical calculations for the assessment of groundwater inflow into a pit are given, and light wellpoint systems are shown to be effective under different combinations of natural and engineering conditions.  相似文献   

Spatial variability of concentrations of chlorophyll <Emphasis Type="Italic">a</Emphasis>, dissolved organic matter and suspended particles in the surface layer of the Kara Sea in September 2011 from lidar data     

V. V. Pelevin  P. O. Zavjalov  N. A. Belyaev  B. V. Konovalov  M. D. Kravchishina  S. A. Mosharov 《Oceanology》2017,57(1):165-173

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The organic carbon in the water,the particulate matter,and the upper layer of the bottom sediments of the west Kara Sea     

N. A. Belyaev  V. I. Peresypkin  M. S. Ponyaev 《Oceanology》2010,50(5):706-715

In three sections in the Kara Sea, the contents of the dissolved and particulate organic carbon (the DOC and POC, respectively), as well as of the organic carbon of the bottom sediments (C_org) were determined. The contents of varied from 6.3 to 2400 μg/l for the DOC and from 0.84 to 12.2 mg of C/l for the POC. The average concentrations for all the samples tested amounted to 200 μg/l for the DOC (n = 78, σ = 368) and 2.7 mg/l for the POC (n = 92, σ = 2.7). The concentrations of Corg in the samples of the upper layer of the bottom sediments of the area treated varied from 0.13 to 2.10% of the dry substance at an average value of 0.9% (n = 21, σ= 0.49%). It is shown that the distribution of the different forms of organic matter (OM) is an indicator of the supply and spreading of the particulate matter in the Kara Sea and that the DOC and POC of the Kara Sea are formed under the impact of the runoff of the Ob and Yenisei river waters. It is found that the distribution of the OM of the bottom sediments in the surveyed area of the Kara Sea is closely related to their grain-size composition and to the structure of the currents in the area studied. The variations in the Corg content in the bottom sediment cores from the zone of riverine and marine water mixing represent the variability of the OM burial.  相似文献   

Zooplankton in Bays of the Novaya Zemlya Archipelago: Composition,Distribution, and Role in Phytoplankton Grazing and Biosedimentation     

Amelina  A. B.  Drits  A. V.  Sergeeva  V. M.  Soloviyev  K. A.  Belyaev  N. A.  Dara  O. M.  Demidov  A. B.  Flint  M. V. 《Oceanology》2018,58(6):825-837

Oceanology - The zooplankton community in two bays of the eastern coast of the Novaya Zemlya archipelago (Blagopoluchiya Bay and Tsivolki Bay) has been studied for the first time. Copepods of the...  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   

Isotopic markers of organic matter transformation at the water-sediment geochemical boundary     

Lein  A. Yu.  Belyaev  N. A.  Kravchishina  M. D.  Savvichev  A. S.  Ivanov  M. V.  Lisitsyn  A. P. 《Doklady Earth Sciences》2011,436(1):83-87

Doklady Earth Sciences -  相似文献   

Even-to-Odd Barium Isotope Ratio in Selected Galactic Halo Stars     

Mashonkina  L. I.  Belyaev  A. K. 《Astronomy Letters》2019,45(6):341-352

Astronomy Letters - We have improved the Ba II model atom by taking into account the excitation of transitions through collisions with hydrogen atoms with the rate coefficients from the...  相似文献   

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