Efeitos da velocidade e da direção do vento na uniformidade de aplicação de água de sistemas autopropelidos

Oliveira, Henrique Fonseca Elias de; Colombo, Alberto; Faria, Lessandro Coll; Prado, Giuliani do

doi:10.1590/s0100-69162012000400006

Cited by 5 publications

(4 citation statements)

References 16 publications

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“…Therefore, well designed irrigation systems, with good uniformity of water application and proper irrigation management, provide higher yield, reduce water loss (Prado & Colombo 2011;Oliveira et al, 2012) and leaching (Agostinho, 2011), and maximize available water resources (Santos et al, 2013). For this reason, we need the right combination of the several factors which enable the quantification of water to be applied in each irrigation.…”

Section: Introductionmentioning

confidence: 99%

Spatial variability of available water and micro-sprinkler irrigation in cambisol

et al. 2016

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The technology of irrigation is vital for agricultural production. Thus, description of spatial patterns of both water application and available water capacity in the soil, as well as their interactions, is essential to maximize efficiency of water use in irrigated areas. The objective of this study was to analyze spatial variability of available water capacity in the soil and water application via irrigation using geostatistics. The experiment was conducted in a commercial mango orchard in Cambisol irrigated by micro sprinkler system, in the municipality of Alto do Rodrigues, RN. Analyses of descriptive statistics and geostatistics were performed using the programs GeoR and GS+. Geostatistics was found suitable for describing the structure of spatial dependence of available water capacity in the soil and the flow rate distributed in the area by sprinklers. Moreover, even with good results for Christiansen Uniformity Coefficient (CU) and Distribution Uniformity Coefficient (DU), the area showed spatial variability of flow rate.

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Section: Introductionmentioning

confidence: 99%

Spatial variability of available water and micro-sprinkler irrigation in cambisol

et al. 2016

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“…The similarity of most agro meteorological conditions, especially wind speed, among the experiments performed with the two types of sprinklers are important data for the analysis of the distribution of the water depth during irrigation. Research by Justi et al (2010), , and Oliveira et al (2012) report that higher wind velocit ies can affect water jets as well as their direction, providing distortions regarding the uniformity of water distribution in the soil.…”

Section: Analysis Of the Agrometeorological Vari Ablesmentioning

confidence: 99%

Spatial Variability of the Water Depth Applied by Fixed Sprinkler Irrigation Systems

et al. 2018

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The uniformity of water application is an important factor in the evaluation of sprinkler irrigation systems. This uniformity depends on the type of sprinkler and its operating conditions, such as the arrangement and spacing between the sprinklers in the area; velocity and wind direction during the period of water application and the pressure variation of the irrigation system. The objective of this study was to model, analyze and compare the structure of spatial dependence, as well as the spatial variability of the water depths applied by a sprinkler irrigation system with compensating and non-compensating sprinklers, using geostatistical methods and measurements of accuracy or similarity between the applied water depth maps. The experiment was carried out in an agricultural area, in the city of Cascavel-Paraná-Brazil. A total area of 10 x 10 m was used, with 04 compensating and 04 non-compensating sprinklers installed at a height of 1.5 m. For each type of sprinkler, water levels were measured in 100 collectors spaced 1 x 1 m in the study area in 32 trials. On each test sprinkling was carried out for one hour. The conditions of wind, temperature and air humidity were evaluated at the beginning of each test and at 10-minute intervals with a climatological station. As the geostatistical analysis showed the existence of directional trends, the coordinates were incorporated as covariates to the linear spatial model in the study of the spatial dependence of the average depth of the irrigation water for the two types of sprinklers. The spatial dependence structure that best fits the data when using the compensating sprinklers was the Gaussian model and when the non-compensating sprinklers were used, it was the exponential model. The spatial variability maps of average irrigation water depth (mm) of the trials, obtained by universal kriging, revealed that for both sprinklers there was an increase in the mean level average values in the northwest-southeast direction (135 o in the azimuth system) in the area under study, influenced by wind direction and velocity during the execution of the experiment.

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“…The water distribution of a gun sprinkler, which works in a traveler irrigation machine, is influenced by controllable factors (sprinkler type, nozzle diameter, working pressure, jet angle, wetted angle, and space between strips) and weather factors (wind speed and direction) (Oliveira et al, 2012). Silva et al (2007) reported that traveling gun irrigation systems working with a large gun sprinkler are characterized as having low water application uniformity, especially in windy conditions.…”

Section: Introductionmentioning

confidence: 99%

Asymmetric Wetted Sector Angle in Water Distribution of Traveling Gun Irrigation Systems

Prado

Colombo

2020

Eng. Agríc.

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This work aimed to simulate the water distribution of traveler gun irrigation, working with asymmetrical wetted angles and in windy conditions. In the simulations of a sprinkler with uniform radial profile, the following were considered: i) wetted angles between 180 and 330º; ii) wetted angle asymmetries from 0 to 90º; iii) wind speeds from 0 to 4.5 m s-1 ; and iv) wind direction of 0, 45, and 90º. Christiansen uniformity coefficients (CU) were calculated for strip widths from 30 to 100% of the sprinkler wetted diameter (WD). Regardless of the wetted angle adjustment, irrigations under wind speeds of 4.5 m s-1 should be avoided and strip spacings of less than 50% WD provide high CU for wind speeds up to 3.0 m s-1. For any wind conditions, asymmetries in the wetted angle led to a reduction in CU for a wetted angle of 210º. In the range of wetted angle from 270 to 330º, asymmetric adjustments of up to 20º provided a higher CU than 80% for a wind speed of 3 m s-1 and directions diagonal and perpendicular to the travel path associated with strip spacings between 60 to 70% WD, which are the spacings recommended by manufacturers of traveler irrigation machines.

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Efeitos da velocidade e da direção do vento na uniformidade de aplicação de água de sistemas autopropelidos

Cited by 5 publications

References 16 publications

Spatial variability of available water and micro-sprinkler irrigation in cambisol

Spatial variability of available water and micro-sprinkler irrigation in cambisol

Spatial Variability of the Water Depth Applied by Fixed Sprinkler Irrigation Systems

Asymmetric Wetted Sector Angle in Water Distribution of Traveling Gun Irrigation Systems

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