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| DOI：10.13522/j.cnki.ggps.2017.0548 |
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| A “Multi Dimensional Drainage” System and Its Application in Management of Waterlogging in Lowland Farmlands |
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GAO Yunhua, CHEN Ying, YANG Yanyun, LI Sha, ZHENG Honggang
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College of Hydraulic Engineering，Yunnan Agricultural University， Kunming 650201, China； Engineering Research Center of Science and Technology of Land and Resources， Yunnan Agricultural University，Kunming 650201, China； Owned Assets Management Office of Yunnan Agricultural University， Kunming 650201, China
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| Abstract: |
| 【Objective】 Waterlogging is a challenge facing lowland farmlands and the purpose of this paper is to present an alternative method to tackle this problem. 【Method】 We proposed to reconstruct the lowland farmland by replacing its top sticky soil by a new composite consisting of a permeable layer, a filter layer and a guest soil, counted from the bottom to the surface. In the meantime, drainage channels were constructed on the wall of the drainage ditch connected to the permeable layer. Based on the permeability of all materials and the soil, we calculated the performance of the drainage system before and after the top soil-replacement. 【Result】 The seepage flow from the soil layer after the replacement increased from 5.50×10-8～1.60×10-7 m3/s to 1.10×10-5～3.20×10-5 m3/s, and the draining rate from the channel increased to 8.89×10-3～3.56×10-2 m3/s, higher than the percolating rate of 1.10×10-5～3.20×10-5 m3/s at the permeable soil. 【Conclusion】 The “Multi-dimensional Drainage” system can improve soil permeability and drainage efficacy, thereby offering a potential technology to alleviate waterlogging in lowland farmlands. |
| Key words: waterlogging farmland; seepage; soil dressing; drainage ditch |
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