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Wyszukujesz frazę "very low−volume roads" wg kryterium: Temat


Wyświetlanie 1-2 z 2
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:
Wpływ efektu brzegowego drogi na cechy drzewostanów sosnowych Puszczy Noteckiej
Edge-effect of the road on the Scots pine stands characteristics in the Notecka Forest
Autorzy:
Grajewski, S.M.
Mizera, P.
Powiązania:
https://bibliotekanauki.pl/articles/989417.pdf
Data publikacji:
2016
Wydawca:
Polskie Towarzystwo Leśne
Tematy:
lesnictwo
Puszcza Notecka
drogi publiczne
drogi o malym natezeniu ruchu
oddzialywanie na srodowisko
efekt brzegowy
drzewostany sosnowe
cechy taksacyjne
zasobnosc drzewostanu
miazszosc drzew
road−edge effect
diameter at breast height
growing stock
forest stand value
very low−volume roads
Opis:
The development of the transportation network brings both benefits and threats. Much attention is paid to soil contamination with trace elements, difficulties in animal migration, noise propagation or synanthropisation of the vegetation cover. This paper deals with the effect of provincial road No. 150 on inventory characteristics of neighboring Scots pine stands in the Notecka Forest (western Poland) – one of the larger forest complexes in Europe. Twelve rectangular experimental sites were established perpendicular to the road axis, called belt transects. Each transect consisted of 3−4 plots located at different distances from the pavement edge (fig.). Measurements and estimations were recorded for the plots. Values from all belt transects were approximated within plots at the same distance from the road and then compared using statistical methods. Observations were conducted in Scots pine stands growing on fresh coniferous forest (Bśw) and fresh mixed coniferous forest (BMśw) sites. Reduced stand density that resulted in decreased basal area, volume and growth rates were observed in the immediate vicinity of the road compared to the forest interior. Individual trees were thicker, but more often burdened with defects decreasing timber value. Any considerable effect of the road on tree height wasn't observed. The above mentioned changes were more evident in poorer habitat conditions, while the location in relation to the road had no significant effect. Modified lighting conditions are probably the main cause of these changes. At the edge of Scots pine stands in the Notecka Forest, a unique ecotone has formed under the influence of the provincial road.
Źródło:
Sylwan; 2016, 160, 11; 915-922
0039-7660
Pojawia się w:
Sylwan
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-2 z 2

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