Study on translocating speed and water distribution uniformity of lightweight lateral move irrigation system
Zhang Yisheng1,2, Zhu Delan1,2, Zhang Lin1, Gong Xinghui1,2
1.Institute of Water-saving Agriculture in Arid Areas of China, Northwest A&F University, Yangling, Shaanxi 712100, China; 2.College of Water Resources and Architectural Engineering, Northwest A&F University, Yangling, Shaanxi 712100, China
Abstract:In order to identify a reasonable translocating speed of lateral irrigation system and effects of water distribution uniformity on soil water content under a low operating pressure, a relationship between operating pressure and translocating speed at a rated irrigation quota is established through indoor and field experiments by employing the lightweight lateral move irrigation system developed in house, in addition, the variations in water distribution and uniformity as well as soil water content uniformity are analyzed in terms of time. It is clear that the relationship can estimate the translocating speed and operating pressure accurately under a given irrigation quota. The lowest and highest translocating speeds are 17.27, 58.65 m/h under 40-120 kPa operating pressure at 10, 15 and 20 mm irrigation quotas, respectively. An increasing operating pressure can improve water distribution uniformity slightly, for instance the uniformity is 0.696 for 40 kPa operating pressure, but for 60-120 kPa pressure it is increased to 0.731-0.788. Note that the water distribution uniformity is quite better in soil than on land surface at low working pressure. Particularly, the soil water content uniformity is 0.906 after 6 h since irrigation, but it can be as high as 0.953 after 24 h under 40 kPa working pressure. This suggests that the design specification on water distribution uniformity can be loosened properly by moving the irrigation system faster to reduce operating cost and energy consumption.
张以升,, 朱德兰,, 张林, 巩兴晖,. 平移式喷灌机行走速度及喷灌均匀度试验研究[J]. 排灌机械工程学报, 2014, 32(7): 625-630.
Zhang Yisheng,, Zhu Delan,, Zhang Lin, Gong Xinghui,. Study on translocating speed and water distribution uniformity of lightweight lateral move irrigation system. Journal of Drainage and Irrigation Machinery Engin, 2014, 32(7): 625-630.
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