Your Cart

Your cart is empty

Home  >  Volume 52

29. INTEGRATED GEOPHYSICAL METHOD FOR ENVIRONMENTAL ASSESSMENT OF IKHUENIRO COMMUNITY DUMPSITE, BENIN CITY, NIGERIA. by Iyoha Abraham, Ikhifa Ighodaro and Amadasun Can-voro Osemwengie Volume 52 (July & Sept., 2019 Issue)
Sale price: $0.00
Quantity:

INTEGRATED GEOPHYSICAL METHOD FOR ENVIRONMENTAL ASSESSMENT OF IKHUENIRO COMMUNITY DUMPSITE, BENIN CITY, NIGERIA.

Iyoha Abraham, Ikhifa Ighodaro and Amadasun Can-voro Osemwengie

Department of Physics, Ambrose Alli University, Ekpoma, Edo State.

Department of Physics, Nnamdi Azikiwe University, Awka, Anambra State.

Abstract

Integrated geophysical methods can be very helpful in mapping areas of contaminated soil and groundwater. In this paper the main results from the implementation and interpretation of a combined geophysical survey carried out in Benin City are presented. The objective of the geophysical survey was to study the general hydro-geological behaviour of the formations in the area. Since direct hydrogeological information was not available, two geophysical techniques were applied in the study area. Firstly, the Very Low Frequency electromagnetic (VLF-EM) method was applied to determine the location, orientation and area distribution of the conductive zones. Secondly, at the locations of the conductive zones detected by the VLF survey additional electrical resistivity tomography (ERT) sections were conducted on selected profiles of the VLF-EM lines in order to provide supplementary information concerning the nature of the conductive zones. The combined interpretation of the geophysical data proved very efficient for deciding the most contaminated locations within the dumpsite. The VLF-EM and ERT methods produced pseudo-sections of subsurface electrical conductivity of the site. The VLF-EM revealed highly conductive zones to a depth of 50 m. ERT method revealed persistent low resistivity zones apparently associated with fracture zones which are suspected to be leachate contamination zones to a depth of 39.4m at the dumpsite. With the aid of these tomograms, the conductive zones were mapped and identified within the study site. The VLF-EM and ERT pseudo-sections results correlate very well, and assisted in delineating suspected contamination zones.

Keywords: Fractures, Mapping, Dumpsites, Electromagnetic, Resistivity.

Close
Loading...