September 9, 2021

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Girish Kumar Coauthored a Paper on a Comprehensive Model for Holistic Performance Assessment of Municipal Solid Waste Landfills in the Computers and Geotechnics Journal

Girish Kumar, Ph.D. (California) coauthored a paper entitled "Comprehensive coupled thermo-hydro-bio-mechanical model for holistic performance assessment of municipal solid waste landfills" published in the journal Computers and Geotechnics in Volume 132 in April 2021.

Girish Kumar was the lead author, and his coauthor was Krishna R. Reddy.

Girish Kumar is a Senior Staff Professional based in California with a focus on-site assessment and remediation consulting. He has academic and research experience in geotechnical and geoenvironmental engineering, including landfill design and analysis; environmental remediation; numerical modeling and analysis of geosystems; and life cycle assessment and sustainability quantification. Girish has published over 40 research articles, and his work has been recognized by several professional organizations, including the American Society of Civil Engineers, Environmental Research and Education Foundation, Solid Waste Association of North America, and Air & Waste Management Association.

Computers and Geotechnics provides an up-to-date reference for engineers and researchers engaged in computer aided analysis and research in geotechnical engineering. The journal is intended for an expeditious dissemination of advanced computer applications across a broad range of geotechnical topics.


A comprehensive coupled thermo-hydro-bio-mechanical (CTHBM) model is proposed to simulate the coupled interactions between the hydraulic, mechanical, biochemical, and thermal processes observed in municipal solid waste (MSW) and also assess their influence on the long-term performance of MSW landfills. The hydraulic model is based on two-phase fluid flow through unsaturated porous media. The biochemical model is based on a two-stage anaerobic biodegradation model. The thermal model is based on conductive heat transport with heat generation rates derived from the biodegradation model. The mechanical model uses the soft-soil-creep constitutive model to simulate the time-dependent creep behavior of the waste. The effect of biodegradation and subsequent mass loss on the waste settlement is also incorporated. Using the proposed CTHBM model, two numerical simulations were performed on a typical full-scale landfill cell geometry to determine the long-term spatial and temporal variations in the hydraulic, mechanical, biochemical, and thermal characteristics of waste under conventional and bioreactor landfill conditions. The influence of the dynamic changes in the waste characteristics on the shear behavior of a textured geomembrane-geotextile interface in the bottom liner and cover system of the simulated landfill cell was also examined.

More Information

Learn more about the article: Comprehensive coupled thermo-hydro-bio-mechanical model for holistic performance assessment of municipal solid waste landfills - ScienceDirect
Learn more about the: Computers and Geotechnics | Journal
For consultation regarding the geotechnical and geoenvironmental practice, contact Girish Kumar at This email address is being protected from spambots. You need JavaScript enabled to view it.
Learn more about Girish at: Girish Kumar | LinkedIn