Assessing water distribution characteristics of a variable-rate irrigation system

Hui, Xin; Lin, Xueji; Zhao, Yang; Xue, Mengyun; Zhuo, Yue; Guo, Hui; Xu, Yuncheng; Yan, Haijun

doi:10.1016/j.agwat.2021.107276

Cited by 11 publications

(7 citation statements)

References 31 publications

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“…As one of the common high-efficiency water-saving irrigation devices in farmland, the center pivot irrigation system has rapidly applied in China in recent years due to its advantages including high irrigation efficiency, wide coverage of irrigated area, high automation, and low labor costs (Yan et al, 2020;Baiamonte et al, 2021;Hui et al, 2022a). By the end of 2019, there were more than 18×10 3 sets of center pivot and linear-move irrigation systems used in China, with an irrigation area of nearly 6×10 5 hm 2 , which accounted for about 14.2% of the total sprinkler irrigation area (Hui et al, 2022b).…”

Section: Introductionmentioning

confidence: 99%

“…However, this type of sprinkler attains high instantaneous application rates and poor application uniformity (Silva, 2007;Yan et al, 2011). In contrast, RSPS has higher energy consumption, despite its wide spraying range and relatively uniform water distribution (Faci et al, 2001;Chen et al, 2020;Hui et al, 2022a). Nonetheless, the strong wind resistance characteristics of OSPS make it highly competitive in the sprinkler marketplace (Manke et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

et al. 2022

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“…In the present study, better NRMSE and lower MBE values were obtained in comparison, which is probably due to the weather conditions since the wind speed in their study was higher and ranged from 2.4 to 6.5 m/s during the test periods. In contrast, Hui et al (2022) measured high accuracy values of 16.9%–32.7% NRMSE, 1.4–3.6 mm MBE and 2.4–5.3 mm MAE for constant‐rate irrigation in the case of calm weather conditions. In this case, the higher values compared to this study may be explained mostly by the use of different sprinklers.…”

Section: Resultsmentioning

confidence: 89%

“…Sadler et al (2000) determined that the VRI is optimal to control the spatial distribution of applied irrigation water, improving water use efficiency and crop yield. The uniformity and accuracy of applied water depths are crucial for VRI systems from a water use efficiency point of view (Dukes & Perry, 2006; Hui et al, 2022; King et al, 2006; O'Shaughnessy et al, 2013; Perry & Pocknee, 2003; Sui & Fisher, 2015; Yari et al, 2017). According to ISO 11545‐2009 (ISO Standards, 2009), GB/T 19797‐2012 (Chinese National Standard GB/T, 1979–2012) and ASAE S436.1 (ASABE Standards, 2016), various testing techniques have been sequentially presented for uniformity measurements of both centre pivot and linear‐move irrigation systems.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of new pivoting linear‐move precision irrigation machine

Szabó

Tamás

Kövesdi³

et al. 2023

Irrigation and Drainage

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Due to population growth, freshwater resources around the world are becoming increasingly scarce, and the water supply in agriculture has emerged as one of the limitations of food production. Variable‐rate irrigation (VRI), a type of precision irrigation, allows water‐efficient irrigation techniques to ensure an optimal water supply. The University of Debrecen, in collaboration with Magtár Kft., was the first in Hungary to develop a new laterally mobile irrigation machine equipped with VRI. The subject of our study was the testing of this system. According to the research, high and homogeneous irrigation uniformity was achieved in practice, with a Christiansen uniformity coefficient (CUc%) of 93 ± 2, distribution uniformity (DU%) of 88 ± 2 and coefficient of variation (CV) of 9 ± 2. Irrigation accuracy was also found to be satisfactory (mean absolute error 0.6 ± 0.1, mean bias error 0.2 ± 0.2, normalized root mean square error 8.6 ± 2), and only 1.4% ± 2% was overirrigated and 0.4% ± 0.3% underirrigated. In addition, the uniformity and accuracy of irrigation in different management zones along the pipeline were also investigated, and significant differences (p < 0.05) were found between irrigation water depths. Based on the above, a new laterally mobile irrigation machine equipped with VRI can be used to develop more uniform and accurate irrigation schedules in the future in arable fields as this is critical for water‐saving irrigation management.

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“…To maintain similarity to the installation heights of sprinklers used in most solid-set sprinkler irrigation engineering, the sprinkler in the test was adjusted to 1 m above the cameras of the 2DVD instrument before each trial [29]. Subsequently, the centrifugal pump and manual valves were successively turned on, and the droplet velocity information was collected by the 2DVD under the stable operating pressure and flow rate of the sprinkler.…”

Section: Experimental Designmentioning

confidence: 99%

Sprinkler Irrigation on Sloping Land: Distribution Characteristics of Droplet Impact Angle and Shear Stress

Hui,

Chen,

Shoukat

et al. 2023

Water

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Droplet impact angle and shear stress are important indicators of surface runoff under sprinkler irrigation, and determining the distribution characteristics of these two indicators on sloping land is of great significance for preventing soil surface erosion. Therefore, three slopes (0, 10%, and 20%) and two directions (uphill and downhill) under a Rainbird LF1200 rotary sprinkler were considered in this study. The distribution of droplet impact angles and shear stresses along the radial direction were investigated under various working conditions. The correlations among the droplet impact angle, shear stress, and distance from the sprinkler were also analyzed. These results indicated that the closer to the sprinkler, the larger the droplet impact angle and the smaller the shear stress, and the two indicators gradually decreased and increased with the increase of distance from the sprinkler, respectively. Accordingly, there was a very high potential for soil surface runoff at the spray jet end. It was also observed that the uphill direction generally had a greater impact angle and less shear stress than flat land, while the downhill direction had exactly the opposite result. However, regardless of the direction, an increase in the slope could intensify its effect on the droplet shear stress and impact angle. Therefore, there is an urgent need to focus on the occurrence of surface runoff in soils with larger slopes. In addition, two radial droplet shear stress distribution models were developed, and it was verified that Model 2 had higher accuracy (MAE = 176.6 N m−2, MBE = 32.8 N m−2, and NRMSE = 14.4%) and could be used to predict the average droplet shear stresses at different slopes, directions, and distances from the sprinkler. This study contributes to the soil erosion prevention and the sprinkler irrigation system optimization on sloping land.

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Assessing water distribution characteristics of a variable-rate irrigation system

Cited by 11 publications

References 31 publications

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

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

Evaluation of new pivoting linear‐move precision irrigation machine

Sprinkler Irrigation on Sloping Land: Distribution Characteristics of Droplet Impact Angle and Shear Stress

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