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Wyszukujesz frazę "Havryliuk, Serhii" wg kryterium: Autor


Wyświetlanie 1-2 z 2
Tytuł:
Main forestry and management indices of pine (Pinus sylvestris L.) stands involving beech (Fagus sylvatica L.) in composition of Ukrainian Roztochchia
Autorzy:
Myklush, Yuriy
Myklush, Stepan
Havryliuk, Serhii
Savchyn, Volodymyr
Powiązania:
https://bibliotekanauki.pl/articles/2041218.pdf
Data publikacji:
2021
Wydawca:
Instytut Badawczy Leśnictwa
Tematy:
forest typology
site conditions
pine stands
Pinus sylvestris L.
beech stands
Fagus sylvatica L.
tree species composition
Opis:
As of 2019, the total area of forest stands with the varying proportion of Scots pine (Pinus sylvestris L.) and beech (Fagus sylvatica L.) in composition on the Ukrainian Roztochchia was 11,251.3 ha and the area of pine stands involving European beech in composition was 6879.5 ha. Pine stands involving beech in composition are formed on the fresh, moist and boggy relatively pure and relatively rich soil condition. Pine forest stands (average share of pine exceeds 56%), which include beech in composition occupy more than 80% of the total area of interest. Mature and overmature forest stands dominate most of the landscape. More than 85% of stands are characterized by an average relative completeness. Undergrowth of deciduous tree species, which is mainly formed by European beech or hornbeam (Carpinus betulus L.) and rarely by common oak (Quercus robur L.) or sycamore maple (Acer pseudoplatanus), is available under a canopy of middle-aged, ripening and mature stands. The study points to the need to rethink forest management approaches and eventually to use such methods of forest cuttings that ensure natural regeneration not only of a European beech and common oak, but primarily of a pine. The practice of creating pine plantations in such conditions favourable for its growth and development should be used only in those cases when it is impossible to achieve natural regeneration of pine.
Źródło:
Folia Forestalia Polonica. Series A . Forestry; 2021, 63, 2; 81-87
0071-6677
Pojawia się w:
Folia Forestalia Polonica. Series A . Forestry
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mathematical modelling of filtration processes in drainage systems with different depths of drainage
Autorzy:
Havryliuk, Volodymyr
Bomba, Andrii
Pinchuk, Oleg
Gerasimov, Ievgenii
Klimov, Serhii
Tkachuk, Mykola
Turcheniuk, Vasyl
Powiązania:
https://bibliotekanauki.pl/articles/1841963.pdf
Data publikacji:
2021
Wydawca:
Instytut Technologiczno-Przyrodniczy
Tematy:
conformal mapping
drainage systems
filtration processes
flood protection
mathematical modelling
Opis:
The article discusses the option for the application of the methodology for the solution of boundary value problems on the conformal mapping for the calculation of filtration process in the horizontal systematic drainage, provided that the drain is installed at a different depth. In particular, the case of methods combining fictitious areas and quasiconformal mappings for solving nonlinear boundary conditions problems for calculating filtration regimes in soils with free sections of boundaries (depression curves) and intervals of the “drainage” type. As an example, the authors designed a hydrodynamic flow grid, determined the values of the flows to the drain, established a section line and elicited other process characteristics. The algorithm for the numerical solution of model nonlinear boundary conditions problems of quasiconformal reflection in areas bounded by two equipotential lines and two flow lines, when for one of the sections, the boundary is an unknown (free) curve with fixed and free ends. The conducted numerical calculations prove that the problems and algorithms of their numerical solution, with a relatively small iterations number (k = 141) suggested in the paper, can be applied in the simulation of nonlinear filtration processes that arise in horizontal drainage systems. Total filtration flow obtained Q = 0.9 dm3∙s–1; flow for drains Q1 = 0.55 dm3∙s–1 and Q2 = 0.35 dm3∙s–1 are quite consistent with practically determined values.
Źródło:
Journal of Water and Land Development; 2021, 50; 74-78
1429-7426
2083-4535
Pojawia się w:
Journal of Water and Land Development
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-2 z 2

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