Abstract:A hipótese da existência de uma relação linear entre o alcance de canhões hidráulicos e a velocidade do vento, descrita no modelo de Richards & Weatherhead e amplamente utilizada na simulação da distribuição de água de canhões hidráulicos em condições de vento, foi avaliada neste trabalho para aspersores de tamanho médio. Na avaliação foram consideradas distâncias de alcance entre os aspersores modelos Agropolo/NY e Naan/5024 e os limites de sua área molhada, observadas em ensaios de campo, medidos nas dir… Show more
“…The systems' performance is also greatly affected by the wind, which causes an uneven water distribution. However, the disadvantages are offset by the low investment cost per unit of irrigated area (ha) and by the limited need for hand labour (GRANIER et al 2003;TARJUELO, 2005;OLIVEIRA et al, 2012;GRANIER & DEUMIER, 2013). The systems' problems can be minimized if the design and the operation of the travelling gun systems are performed carefully through the proper selection of the operating pressure, the nozzle type and diameter, and the towpath spacing (overlap).…”
Section: Introductionmentioning
confidence: 99%
“…In fact, the development of computational tools for irrigation has been an important area of research, with several models being developed to support irrigation management (ROLIM, 2013;STEDUTO et al, 2012;ROSA et al, 2012) and the design and management of irrigation systems (PEDRAS et al, 2009;GONÇALVES et al, 2011;VALÍN et al 2012). A large number of studies have been performed based on the use of these models (ANDARZIAN et al, 2011;ROLIM et al, 2011;DAROUICH et al, 2012;FARIA et al, 2012;VALIPOUR, 2012;RODRIGUES et al, 2013;PAREDES et al, 2015;PEREIRA et al, 2015;MIAO et al, 2016).…”
Travelling gun irrigation systems offer great mobility and operation flexibility with a low investment cost per unit of irrigated area. However, the drawbacks include high operating pressure, low application efficiency, and high rainfall, runoff and erosion. Many of these problems can be minimized if the design and operation of travelling gun irrigation systems are carried out carefully, taking into account several design criteria that will ensure the quality of the irrigation performed by the system. The Enrolador software was developed to meet this goal. The software designs the travelling gun irrigation system, performs its simulation and its performance evaluation. This software was experimentally applied in the Alentejo region, Portugal. The design flow rates were computed for maize and sunflower crops with the soil water balance model IrrigRotation, considering a probability of non-exceedance of 75%. Meteorological data from the Évora weather station for the years 1961 to 1990 were used. Five plots with 3, 6, 9, 12 and 15 ha were chosen for the design of the irrigation systems using the software. The Enrolador software was used to select the equipment (gun, hose and reel) and the appropriate operating parameters for each plot. This software allows for the selection of the equipment that best meets the design criteria.
“…The systems' performance is also greatly affected by the wind, which causes an uneven water distribution. However, the disadvantages are offset by the low investment cost per unit of irrigated area (ha) and by the limited need for hand labour (GRANIER et al 2003;TARJUELO, 2005;OLIVEIRA et al, 2012;GRANIER & DEUMIER, 2013). The systems' problems can be minimized if the design and the operation of the travelling gun systems are performed carefully through the proper selection of the operating pressure, the nozzle type and diameter, and the towpath spacing (overlap).…”
Section: Introductionmentioning
confidence: 99%
“…In fact, the development of computational tools for irrigation has been an important area of research, with several models being developed to support irrigation management (ROLIM, 2013;STEDUTO et al, 2012;ROSA et al, 2012) and the design and management of irrigation systems (PEDRAS et al, 2009;GONÇALVES et al, 2011;VALÍN et al 2012). A large number of studies have been performed based on the use of these models (ANDARZIAN et al, 2011;ROLIM et al, 2011;DAROUICH et al, 2012;FARIA et al, 2012;VALIPOUR, 2012;RODRIGUES et al, 2013;PAREDES et al, 2015;PEREIRA et al, 2015;MIAO et al, 2016).…”
Travelling gun irrigation systems offer great mobility and operation flexibility with a low investment cost per unit of irrigated area. However, the drawbacks include high operating pressure, low application efficiency, and high rainfall, runoff and erosion. Many of these problems can be minimized if the design and operation of travelling gun irrigation systems are carried out carefully, taking into account several design criteria that will ensure the quality of the irrigation performed by the system. The Enrolador software was developed to meet this goal. The software designs the travelling gun irrigation system, performs its simulation and its performance evaluation. This software was experimentally applied in the Alentejo region, Portugal. The design flow rates were computed for maize and sunflower crops with the soil water balance model IrrigRotation, considering a probability of non-exceedance of 75%. Meteorological data from the Évora weather station for the years 1961 to 1990 were used. Five plots with 3, 6, 9, 12 and 15 ha were chosen for the design of the irrigation systems using the software. The Enrolador software was used to select the equipment (gun, hose and reel) and the appropriate operating parameters for each plot. This software allows for the selection of the equipment that best meets the design criteria.
Neste estudo é apresentado e avaliado um procedimento para determinar perfis radiais de distribuição de água em condições operacionais intermediárias àquelas dos ensaios. Utilizaram-se 40 perfis radiais do aspersor PLONA-RL250 obtidos com diferentes combinações de 8 diâmetros do bocal principal e 5 pressões de serviço. Perfis radiais medidos nas pressões de 294, 490 e 686 kPa foram utilizados para reproduzir perfis nas pressões de 392 e 588 kPa. Perfis obtidos com bocais de 14 x 6, 18 x 6, 22 x 6 e 26 x 6 mm foram utilizados para reproduzir os perfis com bocais de 16 x 6, 20 x 6 e 24 x 6 mm. Os perfis radiais gerados para pressão de serviço e bocais, comparados aos perfis observados, respectivamente, apresentaram valores médios de: i) coeficiente de determinação de 0,921 e 0,921; ii) coeficiente de variação de 9,5 e 9,4%; iii) probabilidade (teste t de Student) de 88,5 e 87,3%. Simulações digitais da uniformidade de aplicação de água a partir dos perfis radiais observados e gerados por interpolação entre pressão de serviço e diâmetro de bocais apresentaram, respectivamente, erros absolutos médios de 1,36 e 1,44%. O procedimento proposto não influencia significativamente os valores de uniformidade de aplicação de água.
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