The System Dynamics Modeling Method in Application of Geo-Membranes as Landfill Liners
S.O. Ojoawo, A.A. Adegbola

Abstract
This paper examines the performance of geo-membrane materials as landfill liners using the system dynamics modeling approach. The study area is Ogbomoso North Local Government Area of Oyo State, Nigeria. Four (4) materials were studied, these include: Smooth High Density Polyethylene (HDPE), Textured HDPE, Smooth Low Density Polyethylene (LDPE) and Textured LDPE. The main properties of focus on the material were hydraulic conductivity, porosity and thickness. A model was developed by applying the governing equations coded in Visual Basic Computer programming Language. Validation of the model was done with data on the study area. The interrelationship of the properties and the breakthrough times for each material was found through the STELLA 9.1.4 software application. It was found from this research that the effectiveness of the studied geo-membrane material liners is of the order Smooth HDPE > Smooth LDPE > Textured HDPE > Textured LDPE. The Smooth HDPE is therefore recommended for use as landfill liner in the study area.

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