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Effects of Subsurface Pipe Drainage Spacing on Soil Salinity Movement in Jiangsu Coastal Reclamation Area

Author

Listed:
  • Danni Han

    (State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering, Nanjing Hydraulic Research Institute, Nanjing 210029, China)

  • Chao Chen

    (Jiangsu Coastal Development Group Co., Ltd., Nanjing 210036, China)

  • Fan Wang

    (Jiangsu Coastal Ecological Science and Technology Development Co., Ltd., Nanjing 210036, China)

  • Wenping Li

    (Jiangsu Coastal Ecological Science and Technology Development Co., Ltd., Nanjing 210036, China)

  • Hao Peng

    (Jiangsu Coastal Ecological Science and Technology Development Co., Ltd., Nanjing 210036, China)

  • Qiu Jin

    (State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering, Nanjing Hydraulic Research Institute, Nanjing 210029, China)

  • Bo Bi

    (State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering, Nanjing Hydraulic Research Institute, Nanjing 210029, China)

  • Hiba Shaghaleh

    (College of Environment, Hohai University, Nanjing 210098, China)

  • Yousef Alhaj Hamoud

    (College of Hydrology and Water Resources, Hohai University, Nanjing 210098, China)

Abstract

The agricultural development of reclaimed coastal areas in Jiangsu Province is significantly hindered by high soil salinity and an inadequate irrigation and drainage infrastructure. Optimizing the layout of subsurface drainage systems has been identified as an effective means of reducing soil salinity, with the proper designation of engineering parameters being crucial. This study applied 12 treatments (T1–T12) consisting of four different spacings of subsurface drainage pipes (6 m, 11 m, 15 m, and no subsurface drainage pipes) and three observation wells at varying distances from the drainage outlet (5 m, 25 m, and 45 m). Results showed that all three subsurface pipe spacing treatments significantly reduced soil salinity compared to natural drainage, with a smaller subsurface pipe spacing treatment leading to better salt-reducing effects. The farther the distance from the measuring point to the drain, the higher the salinity. As the burial depth of the outlet decreased and spacing between the subsurface drainage pipes decreased, the salinization rate of the 0–60 cm soil layer was higher, while the salt accumulation in the 60–80 cm soil layer was more severe. Therefore, a subsurface drainage pipe spacing of 6 m and an outlet burial depth of 40 cm are recommended as more suitable choices to effectively control salt concentration in the soil. The research aimed to provide scientific reference data and technical support for the optimized design of subsurface drainage engineering parameters while promoting efficient desalination of saline-alkali areas worldwide.

Suggested Citation

  • Danni Han & Chao Chen & Fan Wang & Wenping Li & Hao Peng & Qiu Jin & Bo Bi & Hiba Shaghaleh & Yousef Alhaj Hamoud, 2023. "Effects of Subsurface Pipe Drainage Spacing on Soil Salinity Movement in Jiangsu Coastal Reclamation Area," Sustainability, MDPI, vol. 15(18), pages 1-14, September.
    • Handle: RePEc:gam:jsusta:v:15:y:2023:i:18:p:13932-:d:1243376
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    References listed on IDEAS

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