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| DOI：10.13522/j.cnki.ggps.2019314 |
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| Effects of Sediment Concentration and Operating Water Pressure on Exfiltration of Subsurface Microporous Infiltration Irrigation Pipe |
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LI Menggang, SUN Zhaojun, JIAO Bingzhong, HAN Lei, LI Xingqiang, LI Qian
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1.School of Civil Engineering and Water Conservancy, Ningxia University, Yinchuan 750021, China; 2.Institute of Environmental Engineering Ningxia University，Yinchuan 750021, China; 3.China-Arab Joint International Research Laboratory for Featured Resources and Environmental Governance in Arid Region, Yinchuan 750021, China;4.Key Laboratory of Resource Assessment and Environmental Control in Arid Region of Ningxia, Yinchuan 750021, China
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| Abstract: |
| 【Objective】Understanding the influence of water purity and water pressure in micro-irrigation system is important to ensure its operation. The objective of this paper is to present results of an experimental study on how operating water pressure and sediment concentration of irrigation water combined to affect exfiltration of subsurface microporous infiltration irrigation pipe.【Method】The experiment used tap water and muddy water, with the operating pressure varying from 0 to100 kPa. During the experiment, the change in exfiltrating rate in response to water pressure and sediment concentration was measured and analyzed.【Result】①With the increase in sediment concentration, the water exfiltration rate monotonically decreased as time elapsed. ②The flow regime index of the irrigation pipe was greater than 1; correlation coefficient was greater than 0.98; the exfiltration was sensitive to the pressure in that with the increase in sediment concentration, the exfiltration rate of the pipeline became increasingly sensitive to the pressure. ③The lower the pressure was, the higher it required the purity of the irrigation water to be. Increasing the pressure can compensate the adverse effect of the sediment concentration to some extent. 【Conclusion】When irrigation water contains silt, increasing water pressure in the irrigation system could alleviate sediment blockage and ensure safe operation of the subsurface microporous infiltration irrigation pipe. |
| Key words: porous pipe; sediment concentration; water seepage; emission rate; coefficients of variation |
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