نوع مقاله : مقاله پژوهشی
1 استادیار مؤسسه تحقیقات فنی و مهندسی و کشاورزی، سازمان تحقیقات آموزش و ترویج کشاورزی، کرج، ایران
2 دانشجوی دکتری دانشگاه بین المللی امام خمینی قزوین
عنوان مقاله [English]
This study investigated the effect of hydrostatic pressure on clogging of subsurface clay emitters produced by the Plateau Water and Sustainable Development Institute at the Karaj Agricultural Engineering Research Institute. The Plateau Water and Sustainable Development Institute produces and supplies the mentioned emitters for subsurface irrigation of pistachio trees. It is estimated that each ceramic emitter measures approximately 30 cm in length, has an inner diameter of 1.5 cm, an outer diameter of 2.5 cm, and a wall thickness of 0.5 cm. Three groups of seven emitters were selected and tested consecutively for 42 days to investigate the long-term permeability reduction process. The system was operated at hydrostatic pressures of 0.5, 1 and 2 meters. Based on the results of the study, it was found that the amount of seepage from clay emitters decreased in all hydrostatic pressures over time due to a reduction in the participation of pores in the emitter body in water transfer. After 1000 hours of measuring seepage from clay emitters, it was found that water-soluble solutes accumulated in the porous environment of the earthen body over time and caused clogging over time. Based on the very good correlation between the fitted line and the measured points at hydrostatic pressures of 0.5 meters and 2 meters, all analyses performed in the field of occlusion were based upon the data collected at hydrostatic pressures of 0.5 meters and 2 meters. Clogging values measured after 1000 hours of testing at hydrostatic pressures of 0.5 meters and 2 meters were 38.9 percent and 80.3 percent, respectively, and increased logarithmically. Results demonstrated that the higher the hydrostatic pressure in the system, the higher the clogging of the emitter body when a certain amount of water seeped through it.