Landfill cap models under simulated climate change precipitation: assessing long-term infiltration using the HELP model

G. Sinnathamby, D. H. Phillips*, A. Paksy, M. Halim

*Corresponding author for this work

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Abstract

The Hydrologic Evaluation of Landfill Performance (HELP) model (v 3.04) was used to assess the hydrological performance of two large-scale (~ 80 × 80 × 90 cm) laboratory-based landfill cap models. Desiccation cracking under simulated climate change precipitation (CCP) events was modelled to predict the performance of landfill caps over a 50-year period in Cumbria England, UK. Cumulative infiltration values under different climate conditions were highly sensitive to macro-pore development in the clay liner which is represented by the changing hydraulic conductivity in HELP simulations. Simulation results of cap design 1 (a clay barrier layer only) show that cumulative annual infiltration under normal precipitation (NP) and CCP events, with the initial hydraulic conductivity, ranged between 1 and 2% of the annual precipitation; however, cumulative annual infiltration was 10 to 68% when maximum (degraded) hydraulic conductivity values were used in simulations. A geosynthetic clay liner (GCL) included in cap design 2 significantly reduce cumulative infiltration.

Original languageEnglish
Article number311
Number of pages13
JournalEnvironmental Earth Sciences
Volume83
Issue number10
DOIs
Publication statusPublished - May 2024

Keywords

  • HELP model · Landfill caps · Climate change · Low permeable layer · Clay barrier
  • Climate change
  • Low permeable layer
  • Clay barrier
  • Landfill caps
  • HELP model

ASJC Scopus subject areas

  • Engineering(all)
  • Environmental Science(all)
  • Earth and Planetary Sciences(all)

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