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Variable-Rate Contour-Controlled Sprinklers for Precision Irrigation

Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan www.asabe.org

Citation:  2007 ASAE Annual Meeting  072249.(doi:10.13031/2013.23038)
Authors:   Han Wenting, Fen Hao, Wu Pute, Yang Qing
Keywords:   variable-rate sprinkler; precision irrigation; contour-controlled wetted area; irrigation uniformity; square wetted area sprinkler

The theoretical relationship between several hydraulic performance parameters of variable-rate contour-controlled sprinklers for high uniformity precision irrigation was researched. The operational equation that describes the internal connection of flow rate, rotating speed and throw distance of the variable-rate contour-controlled sprinkler was derived using mathematical theory of limitation and double integral. The derived operational equation indicates that the flow rate of the variable-rate contour-controlled sprinkler is proportional to the product of rotating speed and square throw distance. The square wetted area sprinklers were used to illustrate the application of the operational equation of the variable-rate contour-controlled sprinkler. The theoretical throw distance equation for the square wetted area sprinkler was built. With the operational equation and theoretical throw distance equation, the theoretical flow rate and rotating speed equations of the square wetted area sprinkler were derived. The results of this research provide fundamental principles for the design of variable-rate contour-controlled sprinklers and square wetted area sprinklers.

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