Abstract:The clogging of emitter is one of the bottlenecks restricting the application and popularization of drip irrigation technology. Fluctuated water pressure was adopted to alleviate the problem of emitter clogging inwater with high sediment load.The control effect of three water pressure patterns (constant water pressure, step wave water pressure, trigonometric function wave water pressure) on the clogging of the emitter was evaluated, and the particle size characteristics of clogging substance in emitters and particle size gradation of the substance discharged from emitters under different pressure patterns were analyzed. The results showed that the anti-clogging performance of emitters under fluctuated water pressure treatment was better than that under constant water pressure, and the service life of emitters under fluctuated water pressure emitter was extended by 79.06%, while the waveform change of fluctuated water pressure had little effect on the anti-clogging performance of emitters, and the effective irrigation times provided by emitters under two different waveform of fluctuated water pressure were only 2.77% separated, under fluctuated water pressure treatment, the water flow in the labyrinth channel was violently turbulent, and the sand-carrying capacity of the water flow was enhanced, so that clogging substances deposited and attached to the labyrinth channel can be better removed, compared with the constant water pressure, the content of clay and silt in the emitter clogging substance was decreased by 22.19%~36.75% and 13.22%~25.06%, respectively. In addition, the particle size of emitter under fluctuated pressure was greater than that under constant pressure, and the maximum particle size of the sediment discharged from the emitter under the fluctuated pressure was 54.24μm. which was increased by 44.34% compared with that under constant water pressure.
