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Application of Hydrus-2D Model in Subsurface Drainage of Saline Soil in Coastal Forest Land—A Case Example of Fengxian, Shanghai

Author

Listed:
  • Yuying Wang

    (School of Ecological Technology and Engineering, Shanghai Institute of Technology, Shanghai 201418, China)

  • Haiyan Sun

    (School of Ecological Technology and Engineering, Shanghai Institute of Technology, Shanghai 201418, China)

  • Qian Mo

    (School of Ecological Technology and Engineering, Shanghai Institute of Technology, Shanghai 201418, China)

  • Chengrui Zhuo

    (School of Ecological Technology and Engineering, Shanghai Institute of Technology, Shanghai 201418, China)

Abstract

The study aims to explore saline drainage modeling in coastal saline soils, particularly focusing on subsurface pipe drainage in the Shanghai coastal area. Utilizing Hydrus-2D/3D-2.05 software, dynamic changes in soil–water–salt under various subsurface pipe laying conditions in forested areas were simulated to identify optimal schemes. Indoor and outdoor experiments demonstrated the Hydrus model’s ability to effectively simulate soil–water–salt transport processes under complex conditions. Subsequent simulations under different parameters of underground pipe laying, including burial depths (D = 0.5/0.7/0.9/1.1/1.3/1.5 m) and pipe diameters (Ø = 8/10/12 cm), further corroborated model validation. Among the analyzed schemes, those with burial depths around 0.7 m and pipe diameters under 12 cm exhibited the most substantial salinity improvement. Regression analysis highlighted a significant impact of burial depth D on cumulative salt discharge, with a coefficient of 12.812, outweighing that of pipe diameter Ø. Furthermore, subsurface pipe laying schemes demonstrated long-term benefits and cost advantages, obviating the need for additional irrigation infrastructure. These findings underscore the significance of subsurface pipe drainage in enhancing soil quality, reducing construction expenses, and optimizing land utilization, providing a valuable foundation for the Shanghai Green Corridor development and related initiatives.

Suggested Citation

  • Yuying Wang & Haiyan Sun & Qian Mo & Chengrui Zhuo, 2024. "Application of Hydrus-2D Model in Subsurface Drainage of Saline Soil in Coastal Forest Land—A Case Example of Fengxian, Shanghai," Sustainability, MDPI, vol. 16(11), pages 1-24, May.
    • Handle: RePEc:gam:jsusta:v:16:y:2024:i:11:p:4590-:d:1404105
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    References listed on IDEAS

    as
    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. Kandelous, Maziar M. & Simunek, Jirí, 2010. "Numerical simulations of water movement in a subsurface drip irrigation system under field and laboratory conditions using HYDRUS-2D," Agricultural Water Management, Elsevier, vol. 97(7), pages 1070-1076, July.
    3. Wang, Xiangping & Liu, Guangming & Yang, Jingsong & Huang, Guanhua & Yao, Rongjiang, 2017. "Evaluating the effects of irrigation water salinity on water movement, crop yield and water use efficiency by means of a coupled hydrologic/crop growth model," Agricultural Water Management, Elsevier, vol. 185(C), pages 13-26.
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