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Wyszukujesz frazę "Grajewski, S.M." wg kryterium: Autor


Wyświetlanie 1-5 z 5
Tytuł:
Influence of pavement moisture content on the load-bearing capacity of forest road
Autorzy:
Grajewski, S. M.
Powiązania:
https://bibliotekanauki.pl/articles/100971.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Stowarzyszenie Infrastruktura i Ekologia Terenów Wiejskich PAN
Tematy:
light weight deflectometer
LWD
static load-bearing test
VSS
very low-volume roads
Opis:
The aim of the study was to analyse the interaction between pavement moisture content and load-bearing capacity of an unpaved forest road. The selected experimental road sector was divided into three sections (A, B and C), which were flooded with three different amounts of water 10 mm (section A), 20 mm (section B) and 30 mm (section C), compared with the intense rainfall. Three series of tests were conducted at each section: prior to flooding (1st day of measurements), during the first 24 hours after flooding (2nd day) and during the next 24 hours after flooding (3rd day of measurements). Moisture content of structural layers of the road (surface course, base course and subbase course) were determined and the measurements using a light weight deflectometer (Evd, s/v) and a static plate (E1 , E2 , Io ) were conducted. Recorded averaged results clearly indicate a negative effect of an increase in pavement layers moisture content (e.g. resulting from heavy rainfall) on the forest road carrying capacity and on compaction parameters of its layers. On the third day of the measurements a decrease in the analysed modulus, on average between 16% (E2 ) and 25% (Evd) was observed, but a decrease in compaction by 16% (s/v) and 4% (Io).
Źródło:
Infrastruktura i Ekologia Terenów Wiejskich; 2016, IV/2; 1451-1462
1732-5587
Pojawia się w:
Infrastruktura i Ekologia Terenów Wiejskich
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effectiveness of forest fire security systems in Poland
Autorzy:
Grajewski, S. M.
Powiązania:
https://bibliotekanauki.pl/articles/101173.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Stowarzyszenie Infrastruktura i Ekologia Terenów Wiejskich PAN
Tematy:
forest fire
forest fire risk
forest fire protection
forest fire security
State Forests National Forest Holding
Opis:
It has been estimated that over 80% of forest areas in Poland is threatened with fire. Due to the number of fires and burned area, Poland is counted to the group of European countries where fires break out the most frequently. On average, each year and mostly because of human activity, almost 8.5 thousand fires break out resulting in over 7 thousand ha of burned forest area. Many scientists forecast that the climate warming, decline in precipitation amount and prolonging rainless periods will enhance fire risk in forests, which will translate itself not only into an increase in the number of fires, but also will favour their intensive spreading. The aim of presented paper is estimating the operational efficiency of the fire protection system in Polish forests and the effectiveness of fire extinguishing actions in forests, but also recognition of the effect of the forest area management type on fire statistics. Following data series were investigated: of the number of fires, the burned forest area and average fire area for the years 1990-2016 for the forests under the management of the State Forests National Forest Holding (State Forests NFH) and other managements. Determined trends were analysed by means of Mann-Kendall non-parametric test. A mean area of forest fire was assumed as the main measure of forest fire protection system effectiveness. The area was compared with the other European countries, Canada and the USA. Despite a lack of a tendency for decreasing number of fires in Poland, which is noted in Europe, taking into account a low value and a statistically significant downward trend for average fire area, forest protection and the effectiveness of extinguishing actions in Polish forests should be regarded as very good. The exception are forests remaining beyond the management of the State Forests NFH, where the upward trend for the number of forest fires is alarming.
Źródło:
Infrastruktura i Ekologia Terenów Wiejskich; 2017, IV/2; 1563-1576
1732-5587
Pojawia się w:
Infrastruktura i Ekologia Terenów Wiejskich
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The vascular plants in the “Puszcza Notecka” forest roadside
Autorzy:
Mizera, P.
Grajewski, S. M.
Kasztelan, A.
Powiązania:
https://bibliotekanauki.pl/articles/100975.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Stowarzyszenie Infrastruktura i Ekologia Terenów Wiejskich PAN
Tematy:
forest roads
road edge effect
Scots pine
pine forests
vegetation cover
Opis:
This paper presents the edge effect of a very low-volume road on the belt of roadside vegetation in the “Puszcza Notecka”, Poland - one of the largest compact forest complexes in Europe. The observations were carried out in the vicinity of pine stands in the fresh coniferous forest and fresh mixed coniferous forest sites. Twelve rectangular experimental sites 30 and 50 meters wide at a distance of 0 to 10 meters from the edge surfaces were established. 75 species characteristic for the 13 phytosociological classes and 20 species associated devoided of the diagnostic value were recognized in the roadside area. Native species dominated, where the most numerous species belonged to meadow communities (Molinio-Arrhenatheretea) and ruderal (Artemisietea vulgaris). Despite the significant participation of synanthropic plants, there was no invasion of alien species.
Źródło:
Infrastruktura i Ekologia Terenów Wiejskich; 2016, IV/1; 1143-1156
1732-5587
Pojawia się w:
Infrastruktura i Ekologia Terenów Wiejskich
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Application of a geotextile and geotextile semi-mattress to reinforce a low-bearing capacity subgrade of a forest technological route on a swampy terrain
Autorzy:
Grajewski, S.M.
Czerniak, A.
Kayzer, D.
Kasztelan, A.
Powiązania:
https://bibliotekanauki.pl/articles/61024.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Stowarzyszenie Infrastruktura i Ekologia Terenów Wiejskich PAN
Tematy:
application
geotextile
surface bearing capacity
forest
technological route
forest road
road construction
new technology
swamp area
Źródło:
Infrastruktura i Ekologia Terenów Wiejskich; 2015, IV/3
1732-5587
Pojawia się w:
Infrastruktura i Ekologia Terenów Wiejskich
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The groundwater level changes caused by modernization of water devices in the Pomorze Forest District
Autorzy:
Wróbel, M.
Boczoń, A.
Grajewski, S.
Krysztofiak-Kaniewska, A
Powiązania:
https://bibliotekanauki.pl/articles/101003.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Stowarzyszenie Infrastruktura i Ekologia Terenów Wiejskich PAN
Tematy:
small-scale water retention
groundwater
Opis:
Because of more and more frequent droughts and observed climate changes, infrastructural investments in forest are at present targeted at increasing water resources, which is realized under the so-called small scale water retention. Forest reservoirs located in Pomorze Forest District in the north-eastern Poland, which was selected for research, fits this trend. The constructed facilities were to reduce the indications of habitat dryness and to improve fire prevention. The investment consisting in building 14 objects of water melioration has changed water conditions in the research area. 12 oak dams, stone weir and an earth pond for amphibians have been built. As a result of the realized investment, the level of water has increased and problems with periodical flooding of forest habitats have occurred. At the beginning of 2012, observational and measuring wells were created to monitor all occurring changes of the soil water table. The received data can be useful in clarifying the causes for flooding and in possible suggestions to improve the existing water conditions. This paper presents the analysis of the influence of realized investments on the changes in the level of groundwater between 2012 and 2014.
Źródło:
Infrastruktura i Ekologia Terenów Wiejskich; 2016, III/1; 715-723
1732-5587
Pojawia się w:
Infrastruktura i Ekologia Terenów Wiejskich
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-5 z 5

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