About: Aerodynamics parameters of windbreak based on its optical porosity

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An Entity of Type : http://linked.opendata.cz/ontology/domain/vavai/Vysledek, within Data Space : linked.opendata.cz associated with source document(s)

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rdf:type	skos:Concept http://linked.opendata.cz/ontology/domain/vavai/Vysledek
rdfs:seeAlso	http://www.amet.cz/PorosityContributions.pdf
Description	The paper summarizes the results of wind velocity measurement in different distances from windbreak in combination with optical porosity (OP) determination in different periods. The paper summarizes the results of wind velocity measurement in different distances from windbreak in combination with optical porosity (OP) determination in different periods. (cs) The paper summarizes the results of wind velocity measurement in different distances from windbreak in combination with optical porosity (OP) determination in different periods. Experimental data were obtained by direct measuremet of wind speed and OP analyses of images of four windbreaks in Southern Moravia (part of Czech Republic). Wind speed at 2 m above the soil surface in a defined distance from windbreak had been measured since 2006. Thirty images of different phenological stages of selected windbreaks from 2006 to 2010 were analyzed. Windward or leeward images were converted into black and white spectrum. All available measurements were used for a map creation. The highest values of OP (up to 50%) are achieved in non-vegetation period. Due to the high OP variability in height of terminal tree branches %22OP reduced%22 was also assessed (just squares to 2/3 height of windbreaks were evaluated). The wind speed reduction on the leeward side relatively strongly correlated with OP value. The highest correlation was found out when the wind speed measuremet at 50 m on leeward side was used. The dependence decreases with increasing distance. Full foliage in summer (10% OP) 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 to 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 of OP value, the reduction effect disappers at a distances of 250 m. The quietest zone of evaluated windbreaks with an average height of windbreaks 15-18 m was decreases with increasing porosity. (en)
Title	Aerodynamics parameters of windbreak based on its optical porosity Aerodynamics parameters of windbreak based on its optical porosity (cs) Aerodynamic peremeters of windbreak based on its optical porosity (en)
skos:prefLabel	Aerodynamics parameters of windbreak based on its optical porosity Aerodynamics parameters of windbreak based on its optical porosity (cs) Aerodynamic peremeters of windbreak based on its optical porosity (en)
skos:notation	RIV/00020699:_____/12:#0000656!RIV13-MZE-00020699
http://linked.open...avai/riv/aktivita	P
http://linked.open...avai/riv/aktivity	P(QH82099)
http://linked.open...iv/cisloPeriodika	3
http://linked.open...vai/riv/dodaniDat	2013
http://linked.open...aciTvurceVysledku	Rožnovský, Jaroslav
http://linked.open.../riv/druhVysledku	J - Článek v odborném periodiku
http://linked.open...iv/duvernostUdaju	S - Úplné a pravdivé údaje nepodléhající ochraně podle zvláštních právních předpisů
http://linked.open...titaPredkladatele	Český hydrometeorologický ústav
http://linked.open...dnocenehoVysledku	121242
http://linked.open...ai/riv/idVysledku	RIV/00020699:_____/12:#0000656
http://linked.open...riv/jazykVysledku	cze - čeština
http://linked.open.../riv/klicovaSlova	optical porosity, windbreak, wind speed (en)
http://linked.open.../riv/klicoveSlovo	optical porosity wind speed windbreak
http://linked.open...odStatuVydavatele	SK - Slovenská republika
http://linked.open...ontrolniKodProRIV	[2630C760410E]
http://linked.open...i/riv/nazevZdroje	Contributions to Geophysics and Geodesy
http://linked.open...in/vavai/riv/obor	DG
http://linked.open...ichTvurcuVysledku	1 (xsd:int)
http://linked.open...cetTvurcuVysledku	5 (xsd:int)
http://linked.open...vavai/riv/projekt	Criteria of wind erosion expansion on heavy-textured soils and possibilities of its limitation with biotechnological control measurements.
http://linked.open...UplatneniVysledku	2012
http://linked.open...v/svazekPeriodika	42
http://linked.open...iv/tvurceVysledku	Podhrázská, Jana Rožnovský, Jaroslav Středa, Tomáš Středová, Hana Litschmann, Tomáš
issn	1335-2806
number of pages	14 (xsd:int)

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