Abstract:In order to explore the influence of emitter type on the process of emitter clogging in drip irrigation with muddy water，seven kinds of emitters were selected and two kinds of muddy water were allocated for periodic intermittent irrigation tests. Clogging characteristics of different emitters were compared by putting forward the emitter structure coefficient. The results showed that the type of emitter was an important factor affecting the blockage of emitter, and the structure coefficient of emitter could be used as an important index to measure the antiblockage performance of the different emitters. The anti-clogging performance of emitter was increased with the increase of structure coefficient. When the structure coefficients were the same, the relative flow rate of the cylindrical emitter was larger than that of the flat emitter after two different muddy water tests. For example, when the structure coefficient was 2%, the relative flow rate of the cylindrical emitter was 91.66% and 79.63%, respectively. However, the relative flow rate of the flat emitter was only 75.84% and 65.08%. With the increase of irrigation times, the overall blockage of most emitters was more likely to occur in the flat emitters than in the cylindrical emitters. The clogging mass of different emitters was decreased with the increase of structure coefficient. The order of the structure coefficient of cylindrical emitters and flat emitters in descending trend was E1, E2, E3 and E4, E5, E7, E6. However, the order of the emitters clogging mass after two kinds of muddy water tests in descending trend was E3, E2, E1 and E6, E7, E5, E4.
