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<p>This study investigated optimal operating parameters, specifically emitter pressure head and installation depth for a subsurface Self-regulating, Low-Energy, Clay-based Irrigation (SLECI) system across varying root zone depths. A 2D model was developed and simulated using COMSOL Multiphysics to analyse water flow in the SLECI emitter under different combinations of pressure heads and installation depths. An epsilon-optimisation method was applied to identify optimal operating points. The results showed that the emitter pressure head influenced emitter discharge more strongly than installation depth. However, installation depth significantly influenced the spread and timing of the wetting front as it progressed toward the boundaries of the modelled soil profile. Both the wetted pattern and emitter discharge increased with higher pressure heads. Optimal combinations of pressure head and installation depth were identified for root zone depths ranging from 10 to 90 cm. Recommended pairs (pressure head, depth) are: (25 cm, 5 cm), (150 cm, 2 cm), (25 cm, 15 cm), (50 cm, 20 cm), (50 cm, 25 cm), (75 cm, 30 cm), (75 cm, 35 cm), (100 cm, 32 cm), and (100 cm, 36 cm), corresponding respectively to root zone depths of 10 to 90 cm. These configurations represent trade-offs optimised for efficient water distribution, soil water infiltration, and water application. The study’s findings are intended to support farmers in selecting optimal operating parameters for the SLECI system in sandy loam soils, ultimately improving irrigation water use efficiency in the production of a wide range of crops.</p>

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Optimal operating parameters for a subsurface self-regulating, low energy, clay-based irrigation (SLECI) system in sandy loam soil across multiple rooting depths

  • 期刊论文

  • 发表日期：

    2025年11月21日

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  • Wisdom Eyram Kwame Agbesi,
  • Livingstone Kobina Sam-Amoah,
  • Francis Kumi,
  • Ransford Opoku Darko,
  • George Boafo

摘要

This study investigated optimal operating parameters, specifically emitter pressure head and installation depth for a subsurface Self-regulating, Low-Energy, Clay-based Irrigation (SLECI) system across varying root zone depths. A 2D model was developed and simulated using COMSOL Multiphysics to analyse water flow in the SLECI emitter under different combinations of pressure heads and installation depths. An epsilon-optimisation method was applied to identify optimal operating points. The results showed that the emitter pressure head influenced emitter discharge more strongly than installation depth. However, installation depth significantly influenced the spread and timing of the wetting front as it progressed toward the boundaries of the modelled soil profile. Both the wetted pattern and emitter discharge increased with higher pressure heads. Optimal combinations of pressure head and installation depth were identified for root zone depths ranging from 10 to 90 cm. Recommended pairs (pressure head, depth) are: (25 cm, 5 cm), (150 cm, 2 cm), (25 cm, 15 cm), (50 cm, 20 cm), (50 cm, 25 cm), (75 cm, 30 cm), (75 cm, 35 cm), (100 cm, 32 cm), and (100 cm, 36 cm), corresponding respectively to root zone depths of 10 to 90 cm. These configurations represent trade-offs optimised for efficient water distribution, soil water infiltration, and water application. The study’s findings are intended to support farmers in selecting optimal operating parameters for the SLECI system in sandy loam soils, ultimately improving irrigation water use efficiency in the production of a wide range of crops.