Characterizing center pivot irrigation with fixed spray plate sprinklers

Yan, Haijun; Jin, HongZhi; Qian, Yichao

doi:10.1007/s11431-010-0090-8

Cited by 22 publications

(16 citation statements)

References 14 publications

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“…For the 4.76-and 6.75-mm nozzle diameters, the wetted radii of RSPSs were higher than those of FSPSs. The wetted radii of RSPSs were slightly lower than previous results [49], while those of FSPSs were slightly higher than previous results [20,30]. These could be attributed to different sprinkler height and pressure [50], which could influence the wetted radii.…”

Section: Individual Sprinklerscontrasting

confidence: 67%

“…The water distribution was measured with a series of catch cans [20,30,37,38]. The catch cans for the measurement of the RSPS water distribution were arranged in a matrix according to ISO 8026 [39] and ASCE S398.1 [40].…”

Section: Water Distribution Measurementsmentioning

confidence: 99%

“…The spacing among the catch cans was 150 cm × 150 cm and, in total, 196 catch cans were arranged in 14 × 14 rows (Figure 2a). Because the FSPS results in multiple, clearly separate streams, previous studies proposed many catch can arrangements to measure the water distribution [20,30,41]. In these experiments, we adopted a radiation arrangement, like Clark et al [41].…”

Section: Water Distribution Measurementsmentioning

confidence: 99%

“…Previous studies reported the water distribution characteristics of FSPSs [20,30] and RSPSs [21,31] separately under indoor conditions. Using a translational test device, Playan et al [32] measured sprinkling uniformity coefficients of 80% and 90% for RSPSs and FSPSs, respectively.…”

Section: Introductionmentioning

confidence: 99%

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Comparison of Water Distribution Characteristics for Two Kinds of Sprinklers Used for Center Pivot Irrigation Systems

et al. 2017

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Abstract:Sprinkler selection influences the water distribution uniformity of center pivot irrigation systems. The sprinkling uniformity of the center pivot is crucial for the yield and quality of crops on a large scale. Rotating and fixed spray plate sprinklers (RSPSs and FSPSs) are the two most popular types. However, sprinkler selection is mainly based on price, not on differences in performance between them. Under low-wind field conditions, the water distributions of individual RSPSs and FSPSs with different nozzles (2.78, 4.76, and 6.75 mm in diameter) were measured using a catch can method. Cubic spline interpolation was used for data conversion for FSPS measurements; the nozzle configuration model was used to simulate the water distribution of the same-nozzle-sprinkler pipe section and full circular irrigated areas in a simulated center pivot under three sprinkler intervals of 1.5, 3.0, and 4.5 m respectively. Results showed that (1) individual RSPSs distributed the most water around the sprinkler, whereas individual FSPSs distributed the most water over a ring-shaped region at the periphery of the sprinkler, and the wetted radii for RSPSs and FSPSs ranged from 4.88 to 7.05 m and from 5.02 to 6.85 m, respectively; (2) same-nozzle-sprinkler pipe sections of RSPSs distributed the most water around the central axes of the pipe sections, and their sprinkling uniformities were 44.7%-51.0%, whereas FSPSs distributed the most water over both sides of the axes symmetrically, and less water around the axes, with sprinkling uniformities of 40.3%-58.0%; and (3) the sprinkling uniformities of the full circular irrigated areas were 85.8%-91.7% and 85.8%-86.2% when using RSPSs and FSPSs, respectively, under different sprinkler intervals, and the uniformities were 3.1% and 6.2% higher using RSPSs than FSPSs with sprinkler intervals of 3.0 and 4.5 m, respectively. RSPS accommodated larger sprinkler intervals (>3.0 m) and maintained superior sprinkling performance when compared with FSPS.

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Section: Individual Sprinklerscontrasting

confidence: 67%

Section: Water Distribution Measurementsmentioning

confidence: 99%

Section: Water Distribution Measurementsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Comparison of Water Distribution Characteristics for Two Kinds of Sprinklers Used for Center Pivot Irrigation Systems

et al. 2017

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“…When the groove was rotated counterclockwise by α (Qb position), f and x of each row were changed to Cubic spline interpolation has been widely applied when determining the water distribution patterns from sprinkler irrigation systems, offering smoothness and high accuracy [31,32]. However, noted issues including high radial variability in the water distribution of distinct jets, low water depths near the sprinkler, and high concentrations of water in limited regions far away from the sprinkler [33] have resulted in negative water depths following cubic spline interpolation.…”

Section: Row X-coordinate Valuementioning

confidence: 99%

Modeling and Dynamic-Simulating the Water Distribution of a Fixed Spray-Plate Sprinkler on a Lateral-Move Sprinkler Irrigation System

Zhang

Guo

Sun

et al. 2019

Water

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Uniformity of water distribution plays an important role in evaluating irrigation quality. As necessities in calculating irrigation uniformity during designing a lateral-move sprinkler irrigation system (LMSIS), the water distribution patterns of individual sprinkler in motion are crucial. Considering the limitation of the experiment platform, dynamic water distribution of an isolated sprinkler is difficult to measure, especially for a fixed spray plate sprinkler (FSPS) which LMSIS has been widely equipped with in China, therefore developing a model to simulate dynamic water distribution of a moving sprinkler is necessary. The objective of this study was to develop and validate the theoretical basis for calculating water distribution characteristics of a single FSPS in translational motion applying a superposition method, and provide an optimized operation management of LMSIS. The theoretical model’s validity was verified in an indoor experiment using a Nelson D3000 FSPS in motion with 36 grooves and blue-plate spray heads. The software was programmed using the Eclipse Platform and the software was capable of simulating water distribution pattern and Christiansen uniformity coefficient (Cu). The results indicated that the water distribution simulated by the software presents three peaks of maximum application under varying conditions, and the value of water application peaks decreased as working pressure and/or mounting height increased. Conversely, the wetted diameter increased as working pressure and/or mounting height increased. Working pressure, mounting height, and sprinkler spacing each had a significant effect on the Cu. The Cu increased as working pressure and/or mounting height increased but decreased as sprinkler spacing increased. As a consequence, the model can be used to predict the relative water distribution pattern; and the Cu can be calculated with the simulated data, thus providing a tool for designing a new LMSIS.

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Non-negligible factors in low-pressure sprinkler irrigation: droplet impact angle and shear stress

et al. 2022

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Droplet shear stress is considered as an important indicator that reflects soil erosion in sprinkler irrigation more accurately than kinetic energy, and the effect of droplet impact angle on the shear stress cannot be ignored. In this study, radial distribution of droplet impact angles, velocities, and shear stresses were investigated using a two-dimensional video disdrometer with three types of low-pressure sprinkler (Nelson D3000, R3000, and Komet KPT) under two operating pressures (103 and 138 kPa) and three nozzle diameters (3.97, 5.95, and 7.94 mm). Furthermore, the relationships among these characteristical parameters of droplet were analyzed, and their influencing factors were comprehensively evaluated. For various types of sprinkler, operating pressures, and nozzle diameters, the smaller impact angles and larger velocities of droplets were found to occur closer to the sprinkler, resulting in relatively low droplet shear stresses. The increase in distance from the sprinkler caused the droplet impact angle to decrease and velocity to increase, which contributed to a significant increase in the shear stress that reached the peak value at the end of the jet. Therefore, the end of the jet was the most prone to soil erosion in the radial direction, and the soil erosion in sprinkler irrigation could not only be attributed to the droplet kinetic energy, but also needed to be combined with the analysis of its shear stress. Through comparing the radial distributions of average droplet shear stresses among the three types of sprinklers, D3000 exhibited the largest value (26.94-3313.51 N/m 2 ), followed by R3000 (33.34-2650.80 N/m 2 ), and KPT (16.15-2485.69 N/m 2 ). From the perspective of minimizing the risk of soil erosion, KPT sprinkler was more suitable for low-pressure sprinkler irrigation than D3000 and R3000 sprinklers. In addition to selecting the appropriate sprinkler type to reduce the droplet shear stress, a suitable sprinkler spacing could also provide acceptable results, because the distance from the sprinkler exhibited a highly significant (P<0.01) effect on the shear stress. This study results provide a new reference for the design of low-pressure sprinkler irrigation system.

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Characterizing center pivot irrigation with fixed spray plate sprinklers

Cited by 22 publications

References 14 publications

Comparison of Water Distribution Characteristics for Two Kinds of Sprinklers Used for Center Pivot Irrigation Systems

Comparison of Water Distribution Characteristics for Two Kinds of Sprinklers Used for Center Pivot Irrigation Systems

Modeling and Dynamic-Simulating the Water Distribution of a Fixed Spray-Plate Sprinkler on a Lateral-Move Sprinkler Irrigation System

Non-negligible factors in low-pressure sprinkler irrigation: droplet impact angle and shear stress

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