Sonic anemometry and sediment traps to evaluate the effectiveness of windbreaks in preventing wind erosion
Autor(a) principal: | |
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Data de Publicação: | 2017 |
Outros Autores: | , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Scientia Agrícola (Online) |
Texto Completo: | https://www.revistas.usp.br/sa/article/view/135400 |
Resumo: | The present work analyzes the effectiveness of windbreaks against wind erosion through the study of streamline patterns and turbulent flow by means of sonic anemometry and sediment traps. To this end, windbreaks composed of plastic meshes (7.5 m long and 0.7 m tall) were used. Windbreaks are a good means to reduce wind erosion, as they produce a positive effect on the characteristics of air currents that are related to wind erosion processes. Due to their ease of installation and dismantling, plastic meshes are widely used in areas where they are not required permanently. In our study, the use of a mesh of 13 × 30 threads cm−2 and 39 % porosity resulted in an average reduction of 85 % in face velocity at a height of 0.4 m and a distance of 1 m from the windbreak. The turbulence intensity i increased behind the windbreak because the reduction of mean of air speed on the leeside caused by the flow of air through the windbreak. Fluctuation levels, however, remained stable. The mean values of turbulence kinetic energy k decreased by 65 % to 86 % at a distance of 1 m from the windbreak and at a height of 0.4 m. The windbreak reduces erosion and sediment transportation 2 m downwind (2.9 times the windbreak height). Nevertheless, sediment transportation was not reduced at a height of 1.0 m and the effect of the windbreak was not observed at a distance of 6 m downwind (8.6 m times the windbreak height). |
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Scientia Agrícola (Online) |
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Sonic anemometry and sediment traps to evaluate the effectiveness of windbreaks in preventing wind erosionstreamline patternssemiarid environmentturbulent flowenergy levelsolive The present work analyzes the effectiveness of windbreaks against wind erosion through the study of streamline patterns and turbulent flow by means of sonic anemometry and sediment traps. To this end, windbreaks composed of plastic meshes (7.5 m long and 0.7 m tall) were used. Windbreaks are a good means to reduce wind erosion, as they produce a positive effect on the characteristics of air currents that are related to wind erosion processes. Due to their ease of installation and dismantling, plastic meshes are widely used in areas where they are not required permanently. In our study, the use of a mesh of 13 × 30 threads cm−2 and 39 % porosity resulted in an average reduction of 85 % in face velocity at a height of 0.4 m and a distance of 1 m from the windbreak. The turbulence intensity i increased behind the windbreak because the reduction of mean of air speed on the leeside caused by the flow of air through the windbreak. Fluctuation levels, however, remained stable. The mean values of turbulence kinetic energy k decreased by 65 % to 86 % at a distance of 1 m from the windbreak and at a height of 0.4 m. The windbreak reduces erosion and sediment transportation 2 m downwind (2.9 times the windbreak height). Nevertheless, sediment transportation was not reduced at a height of 1.0 m and the effect of the windbreak was not observed at a distance of 6 m downwind (8.6 m times the windbreak height).Universidade de São Paulo. Escola Superior de Agricultura Luiz de Queiroz2017-12-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionapplication/pdfhttps://www.revistas.usp.br/sa/article/view/13540010.1590/1678-992x-2016-0148Scientia Agricola; v. 74 n. 6 (2017); 425-435Scientia Agricola; Vol. 74 Núm. 6 (2017); 425-435Scientia Agricola; Vol. 74 No. 6 (2017); 425-4351678-992X0103-9016reponame:Scientia Agrícola (Online)instname:Universidade de São Paulo (USP)instacron:USPenghttps://www.revistas.usp.br/sa/article/view/135400/131255Copyright (c) 2017 Scientia Agricolainfo:eu-repo/semantics/openAccessLópez, AlejandroValera, Diego LuisMolina-Aiz, Francisco DomingoLozano, Francisco JavierAsensio, Carlos2017-08-10T18:04:42Zoai:revistas.usp.br:article/135400Revistahttp://revistas.usp.br/sa/indexPUBhttps://old.scielo.br/oai/scielo-oai.phpscientia@usp.br||alleoni@usp.br1678-992X0103-9016opendoar:2017-08-10T18:04:42Scientia Agrícola (Online) - Universidade de São Paulo (USP)false |
dc.title.none.fl_str_mv |
Sonic anemometry and sediment traps to evaluate the effectiveness of windbreaks in preventing wind erosion |
title |
Sonic anemometry and sediment traps to evaluate the effectiveness of windbreaks in preventing wind erosion |
spellingShingle |
Sonic anemometry and sediment traps to evaluate the effectiveness of windbreaks in preventing wind erosion López, Alejandro streamline patterns semiarid environment turbulent flow energy levels olive |
title_short |
Sonic anemometry and sediment traps to evaluate the effectiveness of windbreaks in preventing wind erosion |
title_full |
Sonic anemometry and sediment traps to evaluate the effectiveness of windbreaks in preventing wind erosion |
title_fullStr |
Sonic anemometry and sediment traps to evaluate the effectiveness of windbreaks in preventing wind erosion |
title_full_unstemmed |
Sonic anemometry and sediment traps to evaluate the effectiveness of windbreaks in preventing wind erosion |
title_sort |
Sonic anemometry and sediment traps to evaluate the effectiveness of windbreaks in preventing wind erosion |
author |
López, Alejandro |
author_facet |
López, Alejandro Valera, Diego Luis Molina-Aiz, Francisco Domingo Lozano, Francisco Javier Asensio, Carlos |
author_role |
author |
author2 |
Valera, Diego Luis Molina-Aiz, Francisco Domingo Lozano, Francisco Javier Asensio, Carlos |
author2_role |
author author author author |
dc.contributor.author.fl_str_mv |
López, Alejandro Valera, Diego Luis Molina-Aiz, Francisco Domingo Lozano, Francisco Javier Asensio, Carlos |
dc.subject.por.fl_str_mv |
streamline patterns semiarid environment turbulent flow energy levels olive |
topic |
streamline patterns semiarid environment turbulent flow energy levels olive |
description |
The present work analyzes the effectiveness of windbreaks against wind erosion through the study of streamline patterns and turbulent flow by means of sonic anemometry and sediment traps. To this end, windbreaks composed of plastic meshes (7.5 m long and 0.7 m tall) were used. Windbreaks are a good means to reduce wind erosion, as they produce a positive effect on the characteristics of air currents that are related to wind erosion processes. Due to their ease of installation and dismantling, plastic meshes are widely used in areas where they are not required permanently. In our study, the use of a mesh of 13 × 30 threads cm−2 and 39 % porosity resulted in an average reduction of 85 % in face velocity at a height of 0.4 m and a distance of 1 m from the windbreak. The turbulence intensity i increased behind the windbreak because the reduction of mean of air speed on the leeside caused by the flow of air through the windbreak. Fluctuation levels, however, remained stable. The mean values of turbulence kinetic energy k decreased by 65 % to 86 % at a distance of 1 m from the windbreak and at a height of 0.4 m. The windbreak reduces erosion and sediment transportation 2 m downwind (2.9 times the windbreak height). Nevertheless, sediment transportation was not reduced at a height of 1.0 m and the effect of the windbreak was not observed at a distance of 6 m downwind (8.6 m times the windbreak height). |
publishDate |
2017 |
dc.date.none.fl_str_mv |
2017-12-01 |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
https://www.revistas.usp.br/sa/article/view/135400 10.1590/1678-992x-2016-0148 |
url |
https://www.revistas.usp.br/sa/article/view/135400 |
identifier_str_mv |
10.1590/1678-992x-2016-0148 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
https://www.revistas.usp.br/sa/article/view/135400/131255 |
dc.rights.driver.fl_str_mv |
Copyright (c) 2017 Scientia Agricola info:eu-repo/semantics/openAccess |
rights_invalid_str_mv |
Copyright (c) 2017 Scientia Agricola |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
application/pdf |
dc.publisher.none.fl_str_mv |
Universidade de São Paulo. Escola Superior de Agricultura Luiz de Queiroz |
publisher.none.fl_str_mv |
Universidade de São Paulo. Escola Superior de Agricultura Luiz de Queiroz |
dc.source.none.fl_str_mv |
Scientia Agricola; v. 74 n. 6 (2017); 425-435 Scientia Agricola; Vol. 74 Núm. 6 (2017); 425-435 Scientia Agricola; Vol. 74 No. 6 (2017); 425-435 1678-992X 0103-9016 reponame:Scientia Agrícola (Online) instname:Universidade de São Paulo (USP) instacron:USP |
instname_str |
Universidade de São Paulo (USP) |
instacron_str |
USP |
institution |
USP |
reponame_str |
Scientia Agrícola (Online) |
collection |
Scientia Agrícola (Online) |
repository.name.fl_str_mv |
Scientia Agrícola (Online) - Universidade de São Paulo (USP) |
repository.mail.fl_str_mv |
scientia@usp.br||alleoni@usp.br |
_version_ |
1800222793286025216 |