Wet bulb dimensions associated with different flow and terrain declivity

Souza, José Antonio Rodrigues de; Moreira, Débora Astoni; Salomão, Leandro Caixeta; Cunha, Fernando França da; Pedroso, Renan S.; Silva, Ellen L.; Goncalves, Janine M.; Rezende, Joao G. F.; Costa, João Victor; Filho, Jamerson F. Silva

doi:10.5897/ajar2015.9941

Cited by 3 publications

(2 citation statements)

References 8 publications

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“…The percentage of a localized irrigation system due to declivity can lead to an increase of up to 8.86% per hectare (Cunha et al, 2014). Souza et al (2018) concluded that the slope influences the dimensions and geometry of the wet bulb.…”

Section: Introductionmentioning

confidence: 99%

Statistical Quality Control in Uniformity of Drip Irrigation With Different Slopes

Lopes¹,

Boas²,

Pazuch³

et al. 2019

JAS

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The topography directly influences the functioning of an irrigation system, being necessary the determination of the uniformity to verify its performance. Statistical quality control is a powerful tool for verifying the quality of a process. Thus, it was aimed to use the statistical control of quality in the evaluation of the uniformity of a drip irrigation system in different slopes. The Christiansen’s uniformity coefficient (UC) and Uniformity of Distribution (UD) were determined and analyzed by the control graphs of Shewhart, Zones and CUSUM and by the indices of process capacity (Cp, Cpl and Cpk), in different slopes (0%, 2% and -2%). The slope irrigation was more uniform (UC = 99.03% and UD = 98.45%), however, for all the graphs studied it was out of statistical control. Zone charts were more sensitive than the CUSUM and Shewhart charts.

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Section: Introductionmentioning

confidence: 99%

Statistical Quality Control in Uniformity of Drip Irrigation With Different Slopes

Lopes¹,

Boas²,

Pazuch³

et al. 2019

JAS

View full text Add to dashboard Cite

show abstract

“…Another factor to be considered in evaluating the uniformity of water and fertilizer distribution in drip fertigation systems is the slope of the lateral line. This is because topography has an influence on the uniformity of flow and pressure, as well as on pH, electrical conductivity, among others (Souza et al, 2018). According to (Szekut et al, 2018) the operation of lateral drip lines is affected by the topography of the irrigated area and represents, depending on the type of water applied, changes in the discharge characteristics of emitters.…”

Section: Introductionmentioning

confidence: 99%

Monitoring urea concentration at different slope angles in drip fertigation

Kepp,

Boas,

Haupentha

et al. 2023

Rev. ambiente água

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The use of statistical process control tools in irrigation is becoming widespread as it allows for quick and effective investigation and detection of possible problems with drippers, especially when fertilizer is used in irrigation water and different slopes. Therefore, the research used statistical quality control charts to monitor urea concentration at different inclinations of the lateral line. The experiment was conducted in a protected environment at the Irrigation and Fertigation Laboratory - LIF) in the city of Cascavel, Paraná State, Brazil. It followed a randomized block design, in a 4x3 factorial arrangement, in which fertilizer concentrations were evaluated at three slope angles. Experimental plots were divided into two factors. The first is the type of water (clean water from an artesian well and water with a nitrogen fertilizer at 44% N) subdivided into four subplots, representing concentrations of urea (0, 2, 4, and 6 g L-1). The second factor was slope angle and represented the sub-plots: uphill (2%), level (0%), and downhill (2%). The results show that Shewhart's statistical control charts were sensitive in observing the change in uniformity due to the increase in fertilizer concentration. Water with fertilizer (4 gL-1) affected uniformity at all studied slope levels. The results also show that high concentrations of fertilizers change the pH of the water. The lowest urea concentrations showed the best distribution uniformity results. Keywords: control charts, drip irrigation, Shewhart, uniformity.

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Predicting the spatial distribution of water applied by subsurface drip in clay soil

Rocha,

Miranda,

Silva

et al. 2024

Rev. bras. eng. agríc. ambient.

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In subsurface drip irrigation systems, knowledge of the three-dimensional advancement of water in the soil is essential for selecting emitter spacing and installation depth. This research aimed to develop and test different mathematical models to estimate water distribution in the soil under subsurface drip irrigation. The experiment was set up in a completely randomized design with four replicates. The experimental arrangement was of split-plot in time, with different dripper installation depths in the plots (0, 5, 10, 15, 20, 25, and 30 cm) and in the subplots irrigation application times (0, 60, 120, 180, and 240 min). Three models (SLIDE 6.0, polynomial regression, and SPSS 2.0) were constructed to estimate the water distribution in the soil profile. All models showed statistical indexes within acceptable ranges. In comparison, the model generated in the numerical software SLIDE 6.0 was the one that presented the best performance, followed by SPSS 2.0 and polynomial regression. The generated models were efficient and simple, producing good results in predicting the water distribution in the soil profile under the studied conditions.

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Wet bulb dimensions associated with different flow and terrain declivity

Cited by 3 publications

References 8 publications

Statistical Quality Control in Uniformity of Drip Irrigation With Different Slopes

Statistical Quality Control in Uniformity of Drip Irrigation With Different Slopes

Monitoring urea concentration at different slope angles in drip fertigation

Predicting the spatial distribution of water applied by subsurface drip in clay soil

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