The Application of Geophysical Techniques in Tracking Leachate Plumes Migration in a Typical Cemetery within the Sandy formation in Benin City, Nigeria

Updata:01-01-1970

Source:
By:Idehen Osabuohien, Alile Owens Monday, Airen O. John

DOI: https://doi.org/10.30564/jgr.v2i1.1970

Abstract:
The survey aim is to track leachate plumes within the sandy formation which is below the surface laterite layer. It investigates the presence and
migration of leachate plumes in the sandy region in a typical cemetery
(Third Cemetery), in Benin City, Nigeria. The research engaged Vertical Electrical Sounding (VES), 2-Dimensional computation of migration
in both the vertical and horizontal directions. The electrical resistivity
data collected in parallel equidistant lines was processed to obtain geo
electric models using Res2dinv. The leachate plumes in the cemetery
migrate vertically and horizontally at different rates. The maximum and
minimum rates of vertical migration are 4.1 and 0.2 cm/day respectively,
while the maximum and minimum rates of horizontal migration are 32.8
and 1.7 cm/day respectively. Volumetric analysis of the plume zones
indicates that of the 75,231m3 of the subsurface imaged, 6,322 m3 is the
zone contaminated by leachate plume, that is, 8.4 % of the earth volume
investigated contained leachate plume. The research also showed that
repeated ERT surveys can track movement of leachate plume emanating
from decomposed dead bodies over time in active cemetery. The average
travel time for a leachate plume to transverse a vertical distance of 6.6 m
in coarse sand is 366.7 days at constant migration speed of 1.8 cm/day.
References:

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