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Statements

Subject Item
n2:RIV%2F62156489%3A43210%2F12%3A00190300%21RIV13-MZE-43210___
rdf:type
skos:Concept n14:Vysledek
dcterms:description
The paper summarizes the results of wind speed measuring at different distances from selected windbreak in combination with optical porisity (OP) determination in different periods. Wind speed at 2 m above the soil surface had been measured since 2006. Thirty images of different phenological stages from 2006 to 2010 were analyzed. The highest correlation was found out when use the wind speed measurement at 50 m on the leeward side. The dependence decreases with increasing distance. Full foliage reduces a wind speed about 60% at 50 m and about 30% at 150 m on the leeward. These values for non-foliaged windbreaks decrease on 80 and 90%. Maximum distance of windbreak effect on wind speed reduction was found out by the extrapolation of the curves constructed using the regression equation of wind speed reduction in dependence on OP and different distances from the windbreak. Regardless OP the reduction effect disappears at a distance of 250 m. The quietest zone of evaluated windbreak with an average height of 15-18 m was detected in the area about four times the height. The paper summarizes the results of wind speed measuring at different distances from selected windbreak in combination with optical porisity (OP) determination in different periods. Wind speed at 2 m above the soil surface had been measured since 2006. Thirty images of different phenological stages from 2006 to 2010 were analyzed. The highest correlation was found out when use the wind speed measurement at 50 m on the leeward side. The dependence decreases with increasing distance. Full foliage reduces a wind speed about 60% at 50 m and about 30% at 150 m on the leeward. These values for non-foliaged windbreaks decrease on 80 and 90%. Maximum distance of windbreak effect on wind speed reduction was found out by the extrapolation of the curves constructed using the regression equation of wind speed reduction in dependence on OP and different distances from the windbreak. Regardless OP the reduction effect disappears at a distance of 250 m. The quietest zone of evaluated windbreak with an average height of 15-18 m was detected in the area about four times the height.
dcterms:title
Simulation of wind field influenced by windbreaks Simulation of wind field influenced by windbreaks
skos:prefLabel
Simulation of wind field influenced by windbreaks Simulation of wind field influenced by windbreaks
skos:notation
RIV/62156489:43210/12:00190300!RIV13-MZE-43210___
n14:predkladatel
n15:orjk%3A43210
n5:aktivita
n7:P
n5:aktivity
P(QH82099)
n5:dodaniDat
n10:2013
n5:domaciTvurceVysledku
n19:8780110
n5:druhVysledku
n11:D
n5:duvernostUdaju
n21:S
n5:entitaPredkladatele
n8:predkladatel
n5:idSjednocenehoVysledku
168065
n5:idVysledku
RIV/62156489:43210/12:00190300
n5:jazykVysledku
n13:eng
n5:klicovaSlova
optical porosity; wind erosion; windbreak
n5:klicoveSlovo
n17:optical%20porosity n17:windbreak n17:wind%20erosion
n5:kontrolniKodProRIV
[050EDBAA3134]
n5:mistoKonaniAkce
Ústí nad Labem
n5:mistoVydani
Praha
n5:nazevZdroje
Bioclimate 2012: Bioclimatology of Ecosystems
n5:obor
n6:DG
n5:pocetDomacichTvurcuVysledku
1
n5:pocetTvurcuVysledku
4
n5:projekt
n16:QH82099
n5:rokUplatneniVysledku
n10:2012
n5:tvurceVysledku
Rožnovský, Jaroslav Středa, Tomáš Středová, Hana Litschmann, Tomáš
n5:typAkce
n20:EUR
n5:zahajeniAkce
2012-01-01+01:00
s:numberOfPages
2
n22:hasPublisher
Česká zemědělská univerzita v Praze
n9:isbn
978-80-213-2299-8
n12:organizacniJednotka
43210