1. College of Water Resources and Architectural Engineering, Northwest A&F University, Yangling, Shaanxi 712100, China; 2. Institute of Soil and Water conservation, Northwest A & F University, Yangling, Shaanxi 712100, China; 3. Institute of Soil and Water Conservation, Chinese Academy of Sciences and Ministry of Water Resources, Yangling, Shaanxi 712100, China
Abstract：In order to explore the clogging law and influencing factors of dripper under aerated drip irrigation, four kinds of internal patch drippers E1, E2, E3 and E4 with different characteristic parameters(flow Q, minimum section size min(W, D)and water inlet grid area M)were selected to test the clogging of dripper under aerated(AI)and non-aerated(CK)conditions respectively, and the results were verified by sediment flocculation and sedimentation test. The results show that aeration and emitter structure have a significant effect on the clogging performance of the emitter(P<0.05). The main reasons for aggravating the clogging of the emitter by aeration are that the aeration intensifies the flocculation and sedimentation of sediment particles in the water, accelerates the adhesion of flocculation particles in the laterals and the inlet of the channel, and increases the risk of sudden clogging at the inlet of the emitter. When E4 dripper with larger inlet size is selected, the risk of clogging at the inlet of the channel is reduced, and the flocculation and sedimentation rate of sediment in the channel is slowed down, which shows that aeration slows down the clogging of the dripper. When E1-E3 dripper with smaller inlet size are selected, the flocculation and sedimentation rate of sediment in the laterals increases, and the clogging risk of the inlet of the dripper increases, which shows that aeration aggravates the clogging of the dripper.
