Constraint map for landfill site selection in Akure Metropolis, Southwestern Nigeria

  • J.S. Ojo
  • M.O. Olorunfemi
  • S. Bayode
  • O.J. Akintorinwa
  • G.O. Omosuyi
  • F.O. Akinluyi
Keywords: GIS, Remote Sensing, Geoelectric, Geotechnical, Constrain Map, Landfill Site

Abstract

An integration of remote sensing, soil type, geological, geoelectrical, hydrogeological and geotechnical data was carried out in a GIS environment with a view to developing a constraint map for the location of landfill (waste disposal) site(s) in Akure, Metropolis.. Geomorphological features identified from satellite images include  residual hills, pediments, pediplain and etchplain . The slope (gradient) map displays surface gradients of 0 - 2.5along river channels while areas with moderate and high relief have surface gradients of 2.5 - 6.35o and 6.35 -  29.53o respectively. Satellite-imagery-delineated lineaments predominantly trend NNW-SSE, ENE-WSW and NNE-SSW with subsidiary NW-SE and W-E trends that are typical of the Basement Complex region of Nigeria. The engineering geotechnical results show that charnockite-derived soils are very clayey and silty in nature (with % clay content > 18%) with low permeability, and are therefore more suitable for waste disposal (landfill) site than the sandy and gravely (with low % clay content < 7%) granite and migmatite gneiss-derived soils. VESderived topsoil and weathered layer are characterized by relatively low layer resistivity values (< 100 ohm-m) over basic charnockitic rocks. The synthesis of the above results enables the classification of the Akure metropolis into three landfill suitability zones – unsuitable (28.6%); moderately suitable (40.4%), and suitable (13%) for waste disposal (landfill) sitting.

Keywords: GIS, Remote Sensing, Geoelectric, Geotechnical, Constrain Map, Landfill Site.

Published
2016-03-10
Section
Articles