%0 Journal Article
%T Water distribuition characteristics and soil loss of LEPA Quad-Spray emitter nozzles Caracter¨ªsticas de distribui  o de ¨¢gua e perdas de solo de bocais do emissor Quad-Spray tipo LEPA
%A Moises S. Ribeiro
%A Luiz A. Lima
%A Alberto Colombo
%A Ana C. D. M. Caldeira
%J Engenharia Agr¨ªcola
%D 2013
%I Sociedade Brasileira de Engenharia Agr¨ªcola
%X The objective of this study was to characterize water application rate, water application pattern width, flow rate, water distribution uniformity and soil loss caused by nozzles of the Low Energy Precision Aplication (LEPA) type Quad-Spray emitter. The study was carried out at the Hydraulic and Irrigation Laboratory of the Department of Engineering at the Federal University of Lavras, in Lavras, state of Minas Gerais - MG, Brazil. Twenty-two (22) LEPA Quad-Spray emitter nozzles were evaluated, with nozzle diameter ranging from 1.59 to 9.92 mm. The experimental design used was entirely randomized, with three replications.Increasing values of nozzle flow rate ranging from 77.44 up to 3,044 L h-1, were obtained with increasing nozzle diameter sizes. Application pattern width ranged from 0.56 up to 3.24m, according to nozzles diameter size. Low values of CDU (maximum of 35.73%) were observed when using the Quad-Spray nozzles. Observed average water application rates covered the range between 68.05 mm h-1 (the lowest value that was obtained with the 2.38mm nozzle) and 258.15 mm h-1 (the highest value that was observed with the 9.92 mm). Average water application rates increased in a simple non-linear function with the increase of nozzle size diameter. However, the weighted average increase in the amount of soil loss by erosion was not related to the increase of weighted average water application values. Foi objetivo deste trabalho caracterizar a taxa de aplica  o de ¨¢gua, largura do padr o molhado, vaz o, uniformidade de distribui  o de ¨¢gua e perdas de solo de bocais do emissor Quad-Spray tipo Low Energy Precision Aplication (LEPA). O trabalho foi realizado no Laborat¨®rio de Hidr¨¢ulica e Irriga  o (LHI), do Departamento de Engenharia (DEG), na Universidade Federal de Lavras (UFLA), Lavras - MG. Foram avaliados 22 bocais com diametro de bocal variando de 1,59 a 9,92 mm. O delineamento experimental estat¨ªstico foi o inteiramente casualizado, com tr¨ºs repeti  es. Valores crescentes de vaz o dos bocais variaram de 77,44 a 3.044 L h-1, com o aumento do diametro de bocal. Foram observados valores de largura do padr o de molhamento de 0,56 a 3,24 m, de acordo com o diametro dos bocais. Baixos valores de CUD (m¨¢ximo de 35,73%) foram verificados entre os bocais do Quad-Spray. As taxas m¨¦dias de aplica  o de ¨¢gua foram 68,05 mm h-1 (menor valor) e 258,15 mm h-1 (maior valor), verificadas, respectivamente, para os bocais de 2,38 e 9,92 mm de diametro que aumentaram em uma fun  o n o linear simples com o aumento do diametro do bocal. O aumento da m¨¦dia ponderada de per
%K caracter¨ªsticas t¨¦cnicas do Quad-Spray
%K redimensionamento de bocais
%K impacto erosivo
%K technical characteristics of the Quad-Spray
%K resizing of nozzles
%K erosive impact
%U http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162013000200002