Geophysical imaging of municipal solid waste contaminant pathways |
| |
| Authors: | N K Abdullahi I B Osazuwa |
| |
| Institution: | (1) Applied Science Department, College of Science and Technology, Kaduna Polytechnic, P.M.B. 2021, Kaduna, Nigeria;(2) Physics Department, Ahmadu Bello University, Zaria, Nigeria |
| |
| Abstract: | Surface electrical and electromagnetic surveys were conducted on top of a solid waste facility in Unguwan Dosa, Kaduna State,
Northwest Nigeria. The aim of the geophysical survey was to detect vertical and subvertical fractures that may provide pathways
for groundwater and contaminant transport. Results from the 2D electrical resistivity imaging showed vertical and subvertical
contacts overlain by 6–10 m thick overburden. Quantitative interpretation of the VLF-EM data correlates well with the results
of the 2D resistivity imaging delineating the vertical and subvertical contacts as good and weak conductors (fractures zones)
with resistivity values of 40–220 and 300–420 Ω m, respectively. Azimuthal Schlumberger VES measurements yield apparent anisotropy
values ranging from 1.01 to 1.47 for electrode spacings of 1–45 m with the highest value recorded at spacing of 2 m. However,
azimuthal variations at large spacings (30–45 m) showed no fracture anisotropy due possibly to the array’s low sensitivity
to anisotropy at these spacings. The result of the study showed that pollutants in the leachate can reach and contaminate
the groundwater. Therefore, urgency for leachate treatment at this site is recommended to prevent contamination of groundwater. |
| |
| Keywords: | |
| 本文献已被 SpringerLink 等数据库收录！ |
|
