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| DOI：10.13522/j.cnki.ggps.20170027 |
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| Experimental Study on the Feasibility of Combined Drip Irrigation Pipes to Ameliorate Emitter Blocking |
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XU Luquan, LI Yuannong, FANG Yunjie, YIN Minhua, HUANG Peng, WANG Kaiyu, FANG Heng
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Key Laboratory of Agricultural Soil and Water Engineering in Arid and Semiarid Areas, Ministry of Education, Northwest A＆F University, Yangling 712100, China
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| Abstract: |
| 【Objective】 Emitter clogging by sediment is a common issue in drip irrigation and in this paper we studied the feasibility of using multiple drip irrigation pipes to resolve this problem by taking the Φ16 drip irrigation pipe as an example. 【Method】The size of the sediment particles in irrigation water was smaller than 0.10 mm and the sediment concentration was 1.00, 1.25 and 1.50 g/L respectively. The working pressure was 0.025 MPa and 0.075 MPa respectively. We used periodic irrigation to control the change in flow rate from the emitter and the clogging of the emitter and the pipe was analyzed using the Christiansen coefficient uniformity. We then relayed the Φ16 pipe and replaced the pipe in the proximity (750 mm) of the clogged emitter by Φ20 pipe to make a combined drip irrigation pipe; its efficacy in alleviating clogging under the same flow rate, working pressure and sediment concentration was re-analyzed experimentally.【Result】 Under pressure 0.025 MPa, the combined pipe arrangement made the blockage concentrate at some locations. When the sediment concentration was 1.25 g/L, the efficiency of the system in mitigating clogging was manifest. Under pressure 0.075 MPa, the efficiency of the system in alleviating clogging improved considerably as the sediment concentration increased.【Conclusion】The combined pipe arrangement was able to mitigate pipe clogging under certain conditions and it also changed the type of blockages. |
| Key words: drip irrigation pipe; clogging; pressure; sediment concentration; Christiansen coefficient uniformity; relative flow |
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