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| DOI：10.13522/j.cnki.ggps.20180064 |
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| Performance of a New Subsurface Drain System |
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NIE Jinjie, LI Mingsi, LIANG Mengfan, QIN Wenbao
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1.College of Water Resources and Architectural Engineering, Shihezi University, Shihezi 832003, China; 2.Taheyuan Survey and Design Institute, Akesu 843000, China
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| Abstract: |
| 【Objective】 The efficacy of subsurface drain depends on many factors and the aim of this paper is to present a new system and the testing results of its efficiency. 【Method】 The new system consisted of ordinary subsurface drain and vertical or zig-zag pipes functioning as macropores to facilitate downward soil water flow. The experiment was conducted in soil tanks and we compared the performance of using three, four and five such pipes to enhance soil water movement; subsurface drain without such pipes was the control. In each treatment, we measured soil moisture, salt content, and water drainage from the subsurface drain. 【Result】①Subsurface drain without the pipe failed to function, while coupled with the pipes enabled it to drain 7.81 to 12.25 L of water, increasing with the pipe number. ②The vertical pipes was more effective, increasing water drainage by 7.97%~19.57% compared to the zigzag pipes. ③CK leached salt from the top soil but accumulated it in the subsoil. In contrast, the drain with the pipes can leach salt from the entire soil profile, with a leaching rate of 92.86% for the topsoil and 65.25% for the subsoil; the leaching rate increased with the pipe number. 【Conclusion】The new subsurface drain system could facilitate salt leaching and the leaching rate increased with pipe numbers. It can be used in areas where the soil is less permeable. |
| Key words: drip irrigation; subsurface pipe drainage; macropore flow conduit; drainage effect; desalination rate |
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