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Characteristics of limited flow and soil water infiltration boundary of a subsurface drip irrigation emitter in silty loam soil

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  • Wang, Jian
  • Tian, Zuokun
  • Yang, Ting
  • Li, Xuechun
  • He, Qiu
  • Wang, Duo
  • Chen, Rui

Abstract

The accurate estimation of the infiltration boundary of a buried point source is required in the hydraulic design of a subsurface drip irrigation (SDI) system, as well as in the numerical simulation of soil water movement. In this study, an experiment was conducted to measure the variation in emitter flow rate and soil back pressure in silty loam soil. The infiltration cavity was observed, and the radius was estimated by matching the measured emitter flow rate and soil back pressure using HYDRUS-2D simulations. The relationship between the cavity radius, emitter flow rate, and soil back pressure, as affected by the soil bulk density, working pressure, and nominal emitter flow rate, are discussed. The results indicate that the infiltration cavity formed rapidly during irrigation with an irregular shape. The surface area increased as nominal emitter flow rate increased and soil bulk density increased. The variation of flow rate as a function of time had no necessary relationship with that of soil back pressure, due to the formation of the cavity. When the infiltration process became stable, higher soil bulk density resulted in increase in soil back pressure and decrease in emitter flow rate. However, the effects of working pressure and nominal emitter flow rate on soil back pressure were unclear. The emitter flow rate and back pressure, solved by an existing analytical model using estimated radius, demonstrated satisfactory agreement with the measured data, with the minimum root-mean-square error (RMSE), compared with those using a constant radius. When the infiltration boundary was taken as a constant head, the soil back pressure and cavity both significantly affected the simulated soil wetting patterns. The effect of cavity radius on the wetting front could be neglected for the constant flux boundary.

Suggested Citation

  • Wang, Jian & Tian, Zuokun & Yang, Ting & Li, Xuechun & He, Qiu & Wang, Duo & Chen, Rui, 2024. "Characteristics of limited flow and soil water infiltration boundary of a subsurface drip irrigation emitter in silty loam soil," Agricultural Water Management, Elsevier, vol. 291(C).
    • Handle: RePEc:eee:agiwat:v:291:y:2024:i:c:s0378377423005012
    DOI: 10.1016/j.agwat.2023.108636
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    References listed on IDEAS

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    1. 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.
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    4. Cai, Yaohui & Wu, Pute & Zhang, Lin & Zhu, Delan & Chen, Junying & Wu, ShouJun & Zhao, Xiao, 2017. "Simulation of soil water movement under subsurface irrigation with porous ceramic emitter," Agricultural Water Management, Elsevier, vol. 192(C), pages 244-256.
    5. Xi, Benye & Bloomberg, Mark & Watt, Michael S. & Wang, Ye & Jia, Liming, 2016. "Modeling growth response to soil water availability simulated by HYDRUS for a mature triploid Populus tomentosa plantation located on the North China Plain," Agricultural Water Management, Elsevier, vol. 176(C), pages 243-254.
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