New fish species in the Russian part of the gulf of Finland and inland water bodies of St. Petersburg and Leningrad Oblast

2014 ◽  
Vol 5 (2) ◽  
pp. 90-98 ◽  
Author(s):  
I. Yu. Popov
2015 ◽  
Vol 8 ◽  
Author(s):  
Mustafa S.F. Ziyadi ◽  
Laith A. Jawad ◽  
Mustafa A. Almukhtar ◽  
Thomas Pohl

Three adult specimens of the fish speciesAcentrogobius dayiwere collected from Sawa Lake, south-west of Baghdad, Iraq. The current report represents the first record ofA. dayifrom Sawa Lake and from other inland water bodies of Iraq.


2016 ◽  
Vol 52 (6) ◽  
pp. 43-49
Author(s):  
V. V. Zamorov ◽  
Ye. Yu. Leonchyk ◽  
M. P. Zamorova ◽  
M. M. Dzhurtubayev

2011 ◽  
Vol 5 (2) ◽  
pp. 205 ◽  
Author(s):  
Gouri Sankar Bhunia ◽  
Shreekant Kesari ◽  
Nandini Chatterjee ◽  
Dilip Kumar Pal ◽  
Vijay Kumar ◽  
...  

Author(s):  
Alexey Osipov ◽  
Georgy Osipov ◽  
Vasily Kovyazin

Biogenic pollution of water bodies and their eutrophication is one of the most serious environmental problems of our time. One of the sources of water pollution with biogenic substances is forests, which belong to the background sources of biogenic load. Currently available methods for assessing the removal of nutrients from the forest vegetation cover do not provide the desired results, which causes an urgent need for their improvement. This article describes the method developed by the authors of geoinformation modeling of removal of biogenic substances from the forest vegetation cover to water bodies, taking into account the spatial distribution of vegetation in the catchment area, its species composition and absorption of biogenic substances during their migration. The Eastern part of the Gulf of Finland was adopted as the object of testing of the developed method. this is due to the fact that eutrophication processes are actively manifested within its water area. The volume of the background biogenic load on the Gulf of Finland, formed during the decomposition of the fall of the natural vegetation cover in the catchment area, was determined based on the specific removal of biogenic substances from plant communities and their absorption during migration “plant community — water object”. The total background biogenic load on the eastern part of the Gulf of Finland, formed as a result of decomposition of natural vegetation cover, was 170.21 t/year for the northern catchment for nitrogen, 12.14 t/year for phosphorus, and 207.31 t/year for the southern catchment for nitrogen , and 15.68 t/year for phosphorus. The data obtained do not contradict the results of other authors who study the background biogenic load on the Gulf of Finland. The method can be effectively used in the development of measures to reduce the nutrient load on water bodies and planning of economic activities in catchments.


2021 ◽  
Author(s):  
Irina Soustova ◽  
Yuliya Troitskaya ◽  
Daria Gladskikh

<p>A parameterization of the Prandtl number as a function of the gradient Richardson number is proposed in order to correctly take into account stratification when calculating the thermohydrodynamic regime of inland water bodies. This parameterization allows the existence of turbulence at any values ​​of the Richardson number.</p><p>The proposed function is used to calculate the turbulent thermal conductivity coefficient in a k-epsilon mixing scheme. Modification is implemented in the three-dimensional hydrostatic model developed at the Research Computing Center of Moscow State University.</p><p>It is demonstrated that the proposed modification (in contrast to the standard scheme with a constant Prandtl number) leads to smoothing all sharp changes in vertical distributions of turbulent mixing parameters (turbulent kinetic energy, temperature and thickness of the shock layer) and imposes a Richardson number-dependent relation on the empirical constants of k-epsilon turbulent mixing scheme.</p><p>The work was supported by grants of the RF President’s Grant for Young Scientists (MK-1867.2020.5) and by the RFBR (19-05-00249, 20-05-00776). </p>


2021 ◽  
pp. 317-325
Author(s):  
D. S. Gladskikh ◽  
A. M. Kuznetsova ◽  
G. A. Baydakov ◽  
Yu. I. Troitskaya

2017 ◽  
Vol 198 ◽  
pp. 345-362 ◽  
Author(s):  
Igor Klein ◽  
Ursula Gessner ◽  
Andreas J. Dietz ◽  
Claudia Kuenzer

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