LIFTING PRELIMINARY OF ATTENUATION OF NOISE By means of VEGETABLE ENCOUNTERED ON THE BIOMASS OF THE FENCED-IN TRACT OF LAND FOREST GROSS & FOREST AMAZÔNICA Almeida, J.S ¹ ² ³ ., Arruda, I.L² 1 CEMAT – Centrais Elétricas do Mato Grosso; Rua Manoel dos Santos Coimbra nº 184 – Bandeirantes - CEP:78010900 – Cuiabá-MT, 2 ECO – Assessoria e Consultoria em Projetos Ambientais; Rua Presidente Marques nº1772 Ed. Paraty, Sala 304 – Santa Helena – CEP: 78045-100 – Cuiabá –MT. E-mail:
[email protected]/
[email protected] 3 IPOG – Instituto de Pós Graduação de Goiás
Abstrat On region center - west of the Brazil , observer - if a tile of aspects among the what , detachment - if Fenced-in tract of land , Forest Amazônica & Swamp , with an estimate of 93 thousand species vegetable approximately. With this enormous Biodiversity of Flora , fomentation - on the developing a study of attenuation of noise aggravated by means of some vegetable. I study preliminary with added of 100 species of this vegetable already tester , stands out Eugenia malaccensis (jambo - red ), Pachira aquatica Aubl (múnguba ), Bambusa sp.(bambu) the species again in ascertainment locally acquaintance I eat Doradinha. The plates of this vegetable , they present attenuation of 1 the 4dB sounds with busy of 250Hz & SPL 96.7dB THE & LEQ 91.1dB into the interval of 1 minute , being as the cups of this vegetable can attenuate depending on the busy of the sound but also 10dB.
Introduction In the region center-west of Brazil, a mosaic of fisionomias is observed among which, Open pasture, Amazonian Forest and Pantanal are distinguished, with a estimate of 93 a thousand vegetal species approximately. In Brazil few correlatadas works of research exist many approaching attenuation of noise with vegetables, what in it instigated them to develop a study of attenuation of noise provoked by means of some existing vegetables in the enormous Biodiversity of the Center Brazilian West.
Objective The work considers a Survey of Attenuation of Noises by means of vegetal species of the Open pasture and the Amazonian Forest with leafy pantries that they provoke of caimento of until 10dB.
Methodology Gaugings with the presence of Vegetables: The gaugings simultaneously occur with 2 Measurers of Sonorous Pressure 949 SVAN in band 1/3 eighth in Slow and Fast in the Curves and C in dB Disposição of the Measurers of Sonorous Pressure: 1 Measurer of settled Sonorous Pressure to 1m to the front of the Leafy Pantry of the Vegetable; 1 Measurer of settled Sonorous Pressure to 1m behind the Leafy Pantry of the Vegetable. Interval of Time of the Gaugings: It occurs in an interval of 1 minute, with absence of other external noises and aeolian forces worthless. Source of Noise: To 1,20m to the front of the Vegetable. Type of Noise: I continue and in low frequency Gaugings with absence of vegetables (Linear Noise):
The gaugings simultaneously occur with 2 Measurers of Sonorous Pressure in band 1/3 eighth in Circuits Slow and Fast in the Curves and C in dB(A). Used Measurer: 2 - Measurers of Sonorous Pressure Type I - Model: 949 SVAN of mark SVANTEK. With Calipers SV The 30 CE. Disposal of the Measurers of Sonorous Pressure: 1 Measurer of Sonorous Pressure settled to the 20 cm of the Emitting Source of Noise in Open field; 1 Measurer of Sonorous Pressure settled to the one corresponding distance the addition of the distances = noise source + the leafy pantry of the vegetable + 1 m behind. 100 assays with the most varied vegetal species found in bioma of matogrossense open pasture and Amazonian forest had been made.
Results The vegetables searched in bioma closed and Amazonian forest with the perenidade characteristics, greater mass, greater porosity, better fibrosidade in the composition of its leves and caules, with dense pantries (connected) of foliar disposal in vertical line present one better attenuation the noises of low frequency. The leves of these vegetables, had demonstrated to attenuations of 1 4dB in sounds with frequency of 250Hz 500Hz and SPL 96.7dB and the LEQ 91.1dB in the interval of 1 minute, being that the pantries of these vegetables can attenuate depending on the frequency of the sound until 10dB.
Bibliographical Reference ABNT, NBR 10:151, Rio de Janeiro.2000 ARAUJO, Marco A. N Medição de Ruído Ambiental. Laboratório de Ensaios Acústicos. INMETRO. Rio de Janeiro,1998. FELDMAN, A. S & GRIMES, C. T. – Hearing Conservation in Industry Baltimore, The Willians & Wilkins,1985. GERGES, S. N. Y. Ruído – Fundamentos e Controle, Florianópolis, 1992. HASSIS, Cyril M. - Manual de Medidas Acústicas y Control del Ruído, Madrid,1995 LORENZI, H. Árvores Brasileiras – Manual de Identificação e cultivos de plantas arbóreas a nativas do Brasil. Vol. 1/ H. Lorenzi. 3 . ed. Nova Odessa – SP Editora Plantarum, 2000. SILVA, Pérides. Acústica arquitetônica e condicionamento de ar (simplificado). 5ª ed. – Belo Horizonte/MG : EDITAL E. T. Ltda, 2005. Árvores exóticas no Brasil: madeiras, ornamentais e aromáticas / Harri Lorenzeti ...[et al.] – Nova Odessa, SP: Instituto Plantarum, 2003.