STUDY OF WATER FLOW AND RETENTION IN CLAY-SAND LINERS

Authors

  • Muawia Dafalla Bugshan Research Chair in Expansive Soils, Civil Engineering, King Saud University, Saudi Arabia
  • Gamal Abdel-Nasser G Alexandria University, Soil and Agricultural Chemistry Department, Egypt
  • Ahmed Al-Mahbashi Bugshan Research Chair in Expansive Soils, Civil Engineering Dept., King Saud University, Saudi Arabia

Keywords:

Clay sand mixture, HYDRUS-2D, Numerical modeling, Landfill cover, Soil liner

Abstract

This research paper presents a simulation study to predict the percolation of water through soil
liners using numerical modeling with HYDRUS-2D. The soil liners included compacted clay/sand mixtures
of 0 to 25% clay at 5 to 30 cm thickness. The cumulative water flux or hydraulic barrier at drain layer at the
end of simulation period reached a ratio of 0.81, 0.54, 0.29 and 0.09 of water flux at a top profile with no soil
liner. The soil liners of 25 and 30 cm thickness with 20% and 15% clay had lesser percolation or water flux
at drain layer by about 0.21 and 0.44 compared to water flux at top layer with no soil liner. Using a modeling
approach efficient liner systems can be designed for use in water harvesting projects or landfill covers. The
modeling and simulation are dependent on the hydraulic conductivity of the compacted soil liner, soil water
characteristics curves as well as irrigation and rainfall rates.

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Published

2018-03-28

How to Cite

Muawia Dafalla, Gamal Abdel-Nasser G, & Ahmed Al-Mahbashi. (2018). STUDY OF WATER FLOW AND RETENTION IN CLAY-SAND LINERS. GEOMATE Journal, 14(43), 83–90. Retrieved from https://geomatejournal.com/geomate/article/view/1586

Issue

Vol. 14 No. 43 (2018): March 2018

Section

Articles

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