Estimation of the zero-plan displacement, roughness length and aerodynamic resistance to water vapour exchange for a corn canopy for conditions of near neutral stability.

Volpe, Clovis Alberto; Brunini, Orivaldo

Estimation of the zero-plan displacement, roughness length and aerodynamic resistance to water vapour exchange for a corn canopy for conditions of near neutral stability.

Zero-plane displacement, roughness length and aerodynamic resistance to water vapour exchange for conditions of near neutral stability were determined, using different profiles of wind speed above a corn canopy with a mean height of 2.80 m, during the tasselling period. The results showed a decrease for the roughness length and a increase in the zero-plane displacement with an increase of the wind speed between the intervals of 0.2 and 3.5 m s-1. In this condition the mean estimated value for the aerodynamic resistance to water vapour exchange was 0.19 s cm-1, very low if compared to the others.

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Main Authors:	Volpe, Clovis Alberto, Brunini, Orivaldo
Format:	Digital revista
Language:	por
Published:	Pesquisa Agropecuaria Brasileira 2014
Online Access:	https://seer.sct.embrapa.br/index.php/pab/article/view/13334
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id	rev-pab-br-article-13334
record_format	ojs
spelling	rev-pab-br-article-133342014-04-17T14:24:18Z Estimation of the zero-plan displacement, roughness length and aerodynamic resistance to water vapour exchange for a corn canopy for conditions of near neutral stability. Estimativas do deslocamento do plano-zero, parâmetro de rugosidade e resistência aerodinâmica à difusão de vapor d´água sobre cultivo de milho em condição de estabilidade próxima à neutralidade. Volpe, Clovis Alberto Brunini, Orivaldo Zea mays; wind speed; water transfer; soil-plant-atmosphere system velocidade do vento; Zea mays; transferência de água; sistema soloplanta- atmosfera. Zero-plane displacement, roughness length and aerodynamic resistance to water vapour exchange for conditions of near neutral stability were determined, using different profiles of wind speed above a corn canopy with a mean height of 2.80 m, during the tasselling period. The results showed a decrease for the roughness length and a increase in the zero-plane displacement with an increase of the wind speed between the intervals of 0.2 and 3.5 m s-1. In this condition the mean estimated value for the aerodynamic resistance to water vapour exchange was 0.19 s cm-1, very low if compared to the others. Através de perfis de velocidade do vento acima de uma cultura de milho (Zea mays L), no estádio de pendoamento e com altura média das plantas de 2,80 m, determinou- se o deslocamento do plano-zero, o parâmetro de rugosidade e a resistência aerodinâmica à difusão de vapor d'água, em condição de estabilidade atmosférica próxima à neutralidade. Observou-se o decréscimo do parâmetro de rugosidade e o acréscimo do deslocamento do plano-zero com o aumento da velocidade do vento no intervalo de 0,2 a 3,5 m s-1. Nessas mesmas condições o valor médio estimado da resistência aerodinâmica à difusão de vapor d'água foi de 0,19 s cm-1', sendo, portanto, muito pequeno em relaçâo aos valores das outras resistências à transferência da água no sistema solo- planta- atmosfera. Pesquisa Agropecuaria Brasileira Pesquisa Agropecuária Brasileira 2014-04-17 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://seer.sct.embrapa.br/index.php/pab/article/view/13334 Pesquisa Agropecuaria Brasileira; v.25, n.1, jan. 1990; 29-37 Pesquisa Agropecuária Brasileira; v.25, n.1, jan. 1990; 29-37 1678-3921 0100-104x por https://seer.sct.embrapa.br/index.php/pab/article/view/13334/7511
institution	EMBRAPA
collection	OJS
country	Brasil
countrycode	BR
component	Revista
access	En linea
databasecode	rev-pab-br
tag	revista
region	America del Sur
libraryname	Sistema de bibliotecas de EMBRAPA
language	por
format	Digital
author	Volpe, Clovis Alberto Brunini, Orivaldo
spellingShingle	Volpe, Clovis Alberto Brunini, Orivaldo Estimation of the zero-plan displacement, roughness length and aerodynamic resistance to water vapour exchange for a corn canopy for conditions of near neutral stability.
author_facet	Volpe, Clovis Alberto Brunini, Orivaldo
author_sort	Volpe, Clovis Alberto
title	Estimation of the zero-plan displacement, roughness length and aerodynamic resistance to water vapour exchange for a corn canopy for conditions of near neutral stability.
title_short	Estimation of the zero-plan displacement, roughness length and aerodynamic resistance to water vapour exchange for a corn canopy for conditions of near neutral stability.
title_full	Estimation of the zero-plan displacement, roughness length and aerodynamic resistance to water vapour exchange for a corn canopy for conditions of near neutral stability.
title_fullStr	Estimation of the zero-plan displacement, roughness length and aerodynamic resistance to water vapour exchange for a corn canopy for conditions of near neutral stability.
title_full_unstemmed	Estimation of the zero-plan displacement, roughness length and aerodynamic resistance to water vapour exchange for a corn canopy for conditions of near neutral stability.
title_sort	estimation of the zero-plan displacement, roughness length and aerodynamic resistance to water vapour exchange for a corn canopy for conditions of near neutral stability.
description	Zero-plane displacement, roughness length and aerodynamic resistance to water vapour exchange for conditions of near neutral stability were determined, using different profiles of wind speed above a corn canopy with a mean height of 2.80 m, during the tasselling period. The results showed a decrease for the roughness length and a increase in the zero-plane displacement with an increase of the wind speed between the intervals of 0.2 and 3.5 m s-1. In this condition the mean estimated value for the aerodynamic resistance to water vapour exchange was 0.19 s cm-1, very low if compared to the others.
publisher	Pesquisa Agropecuaria Brasileira
publishDate	2014
url	https://seer.sct.embrapa.br/index.php/pab/article/view/13334
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Estimation of the zero-plan displacement, roughness length and aerodynamic resistance to water vapour exchange for a corn canopy for conditions of near neutral stability.

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