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| Effect of outsource filter material on subsurface pipe drainage and soil desalination |
| WANG Wenxu1, YANG Shuqing1*, HU Lingling1, ZHANG Wanfeng2 |
| 1. Water Conservance and Civil Engineering College, Inner Mongolia Agricultural University, Huhhot, Inner Mongolia 010018, China; 2. College of Tourism, Inner Mongolia Normal University, Hohhot, InnerMongolia 010022, China |
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Abstract To explore the drainage performance of subsurface pipes and the effect of soil desalination under different outsourcing filter materials, based on the results of laboratory experiments, four kinds of subsurface drainage systems were set up in the field(the buried depth of the subsurface pipes in each system was 80 cm, and the spacing was 20 m), and the outer filter materials used were 68 g/m2 geotextile(L), sand filter material(S), 68 g/m2 geotextile + sand filter material(LS)and non-outsourcing filter material(W), with the local conventional open ditch drainage(CK)as a control, the drainage performance index and soil desalination efficiency of each subsurface pipe system in the spring irrigation process were analyzed through field experiments. The results show that compared with W treatment, the average drainage rate of L, S and LS treatments increased by 7.44%, 12.5% and 15.75%, and the average flow attenuation was reduced by 4.07%; the cumulative drainage volume of S and LS treatments increased by 5.11% and 8.31%(p<0.05). The average soil desalination rate after spring irrigation in each subsurface pipe system was above 47%, which was significantly improved compared with CK treatment. Among them, LS treatment had the best effect, which was 50.94%. In summary, LS treatment should be selected first as the outsourcing filter layout plan of the subsurface pipe drainage system in the Hetao irrigation area. The results of this research can provide theoretical support and scientific guidance for the popularization and application of salt drainage technology through subsurafce pipes in Hetao Irrigation District.
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Received: 20 July 2021
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