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| DOI： |
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| Hydraulic Properties of Diatomite Porous Ceramic Irrigation Emitter |
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PU Wenhui, ZHANG Xinyan, ZHU Delan
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College of Water Resources and Architectural Engineering, Northwest A&F University, Yangling 712100, China
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| Abstract: |
| Irrigation emitter is an important componentin irrigation and this paper investigated the pressure-flow rate relationship in diatomite porous ceramic irrigation emitters under both normal and water-soaked condition. Sediments taken from Wei River was sieved first (d<300 μm) and were then used to make muddy water at sediment concentration of 0.25 g/L, 0.75 g/L and 1.25 g/L respectively. The muddy water with sediment concentration of 0.75 g/L was used in irrigation test using the bothno-soaked and soaked emitters. The testing results showed that the flow rate in the diatomite porous ceramic emitters increased with pressure gradient in a power law. When using tap water for irrigation test, the flow rate decreased with numbers of irrigations, and after the number of irrigations reached 10, the flow rate was reduced by approximately 10%. When using the muddy water, however, the flow was affected not only by the number of irrigations, but also the sediment concentration. When the number of irrigation was the same, the flow rate reduced considerably as the sediment concentration increased. Soaking the emitter led to a decrease in initial flow rate, but reduced the decrease of the flow rate with sediment concentration. Micro morphology showed that the pore size of the porous ceramic was in the range of 10～80 μm. Therefore, irrigation using muddy water with high sediment concentration could affect the performance of the emitters. |
| Key words: infiltrating irrigation; hydraulic performance; irrigation emitter; micro-porous ceramics; diatomite |
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