Center-pivot uniformity analysis with variable container spacing

Marjang, Nat; Merkley, Gary P.; Shaban, Mahmoud M.

doi:10.1007/s00271-011-0272-6

Cited by 12 publications

(4 citation statements)

References 6 publications

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“…Hence the net irrigation depth (d) will be (Equation (2)) [24]: Different sprinkler/sprayer types were used for CHL in which those sprinklers closer to the center would cover a minor area with a shorter distance of throw, while water would be dispersed in a much bigger circle and higher rate at the outermost sprinklers [25] like in the center-pivot systems. The sprinklers discharge rate was chosen to be lower than the soil infiltration rate to avoid runoff and was calculated for each sprinkler separately since the sprinkler and lateral distance in CHL were different to the split lateral semi-permanent.…”

Section: System Designationmentioning

confidence: 99%

Clock Hand Lateral, A New Layout for Semi-Permanent Sprinkler Irrigation System

Gan

Rad

Chen

et al. 2018

Water

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The experiment was done based on a new layout for a semi-permanent set-move sprinkler irrigation system with a lower capital and annual cost requirement. In this work, a center-pivot system layout was applied to set up a semi-permanent system with a hand-move lateral. The clock hand lateral (CHL) sprinkler irrigation system was implemented using a shorter mainline length with a smaller diameter, lesser number of lateral pipes, minimum number of fittings and a single valve outlet. This combination offers an affordable irrigation system with minimizing the required components. The new irrigation system design was examined at the Agricultural Academy of Science experiment farm at Guangxi, China. The sprinkler system mainline pipe directly extended from the water resource to the center of the plot to feed a single lateral, connected through a pivot elbow. The lateral was rotating around the plot manually, the same way as clock hands do. An ordinary set-move split lateral for the same plot was designed for comparison and control. Based on results, a 37.5% capital cost reduction with an 11.2% annual cost decrement was obtained for CHL compared to the set-move semi-permanent. Water application depth was measured via distribution uniformity coefficient (DU) examination, using a catch can method. The low quarter DU for CHL was counted for 86%.

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Section: System Designationmentioning

confidence: 99%

Clock Hand Lateral, A New Layout for Semi-Permanent Sprinkler Irrigation System

Gan

Rad

Chen

et al. 2018

Water

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“…In contrast with ordinary semi-permanent layouts in which sprinkler distances are equal, in a CPL system the lateral irrigates a slice of the watering area at each cycle, therefore the sprinklers' distance of throw will increase toward the lateral to the outmost side. Since the farm corner is a smaller area, sprayers with minor throw distance were applied, however bigger radius sprinklers were used at the end of the line, the same as in the center-pivot technique [29]. The maximum allowable discharge rate for each sprinkler was calculated individually according to a modified formula (Equation 1) [28].…”

Section: Systems Designingmentioning

confidence: 99%

Sustainable Water Resources Using Corner Pivot Lateral, A Novel Sprinkler Irrigation System Layout for Small Scale Farms

et al. 2018

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Sprinkler irrigation systems are widely used in medium and large scale farms in different forms. However less types are available to apply in small farms due to their high costs. The current study was done according to a novel cost effective design for a semi-permanent sprinkler irrigation system for small farm owners. The new layout known as Corner Pivot Lateral (CPL) was examined in irrigation test center at Lijian Scientific and Technological Demonstration Park, at Nanning city, China. CPL was implemented without a main/sub mainline pipe, by applying a single pivoting lateral at the corner of the plot that directly connected to the resource to convey water from the pump. The lateral moves around the corner using a rotating elbow in a quadrant pattern manually to cover the entire farm. A conventional semi-permanent system was applied for the same farm as reference. A cost analysis on the required components as well as annual operational costs was carried out for comparison and control. Results showed that a lower system component would be needed for the CPL method. Overall, more than a 15% capital cost reduction with 7% annual cost decrement was achieved for CPL in this experiment comparatively. The Catch can technique was applied to examine the CPL system’s efficiency and 79% water distribution uniformity around the sprinkler was obtained. This new method can encourage small estate holders to switch from traditional to pressurized systems which optimizes water application costs.

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“…Delirhasannia et al (2010) developed, validated and applied a model to predict the radial irrigation uniformity and the water application along the CP systems while López-Mata et al ( 2010) developed a model that allows simulating the effect of irrigation uniformity on crop yields profitability. Some models, in addition to ease and improve the design of new systems, may be used to support field evaluation of systems under operation, mainly calculating the water application and performance indicators (Tarjuelo et al, 1999;Rodrigues et al, 2001;Duke and Perry, 2006;Marjang et al, 2011). Most commonly used indicators are the distribution uniformity (DU) and the uniformity coefficient (UC), which characterize the system performance and are determined by design variables such as the pressure available at the sprinkler, the pressure variation along the lateral, the nozzle diameter, the water distribution pattern and the wind speed and direction (Pereira, 1999).…”

Section: Introductionmentioning

confidence: 99%