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Theoretical analysis and experimental verification of the improved subsurface drainage discharge with ponded water

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  • Tao, Yuan
  • Wang, Shaoli
  • Xu, Di
  • Guan, Xiaoyan
  • Ji, Mengzhe
  • Liu, Jing

Abstract

The improved subsurface drainage is a new drainage technique which has large discharge verified by experiments. It can be used to solve the problems of frequent floods and cultivated land shortage in South China. Considering large-scale applications, a general drainage formula of the improved subsurface drainage with ponded water in a homogeneous and isotropic soil was proposed based on Kirkham equation. Firstly, the drainage formulas based on different assumptions were deduced and verified by laboratory experiment and field test. Additionally, further validation and simplification were studied by numerical simulation in which the critical conditions to distinguish whether the filter was saturated or not were given. Results showed that the proposed formulas passed the validation by laboratory experiment and field test based on Method 1 and Method 2 in which the bottom of the simplified boundary overlapped with the bottom of the drain pipe and the center of simplified boundary located at the center of filter were assumed respectively. The numerical simulation results showed the formula based on Method 1 was more applicable than that based on Method 2. Moreover, for Method 1, that (b0+h0)/d equaled 0.6 could be regarded as the critical boundary between filter saturated and unsaturated working condition. Considering the ratio of drain distance and impermeable layer depth, a more simplified formula was given. In this simplified formula, that drain spacing was three times of impermeable layer depth was a critical condition. The research results could provide scientific basis for improved subsurface drainage design and lay a good foundation for its application. Meanwhile, it would be beneficial to enrich agricultural drainage technologies and promote development of agricultural drainage in China.

Suggested Citation

  • Tao, Yuan & Wang, Shaoli & Xu, Di & Guan, Xiaoyan & Ji, Mengzhe & Liu, Jing, 2019. "Theoretical analysis and experimental verification of the improved subsurface drainage discharge with ponded water," Agricultural Water Management, Elsevier, vol. 213(C), pages 546-553.
    • Handle: RePEc:eee:agiwat:v:213:y:2019:i:c:p:546-553
    DOI: 10.1016/j.agwat.2018.10.035
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    References listed on IDEAS

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    1. Tao, Yuan & Wang, Shaoli & Xu, Di & Yuan, Hongwei & Chen, Haorui, 2017. "Field and numerical experiment of an improved subsurface drainage system in Huaibei plain," Agricultural Water Management, Elsevier, vol. 194(C), pages 24-32.
    2. Filipović, Vilim & Mallmann, Fábio Joel Kochem & Coquet, Yves & Šimůnek, Jirka, 2014. "Numerical simulation of water flow in tile and mole drainage systems," Agricultural Water Management, Elsevier, vol. 146(C), pages 105-114.
    3. Tao, Yuan & Wang, Shaoli & Xu, Di & Qu, Xingye, 2016. "Experiment and analysis on flow rate of improved subsurface drainage with ponded water," Agricultural Water Management, Elsevier, vol. 177(C), pages 1-9.
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    Cited by:

    1. Qian, Yingzhi & Zhu, Yan & Ye, Ming & Huang, Jiesheng & Wu, Jingwei, 2021. "Experiment and numerical simulation for designing layout parameters of subsurface drainage pipes in arid agricultural areas," Agricultural Water Management, Elsevier, vol. 243(C).
    2. Tao, Yuan & Li, Na & Wang, Shaoli & Chen, Haorui & Guan, Xiaoyan & Ji, Mengzhe, 2021. "Simulation study on performance of nitrogen loss of an improved subsurface drainage system for one-time drainage using HYDRUS-2D," Agricultural Water Management, Elsevier, vol. 246(C).
    3. Ren, Xiaolei & Wang, Shaoli & Yang, Peiling & Tao, Yuan, 2023. "Experimental and modeling evaluation of siphon-type subsurface drainage performance in flooding and waterlogging removal," Agricultural Water Management, Elsevier, vol. 275(C).

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