Characterization of Transmissivity Attributes of Fractured Aquifers from Geo-electrical models: Matuu, Kenya
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Date
2016-05
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International Journal of Scientific Engineering and Applied Science (IJSEAS)
Abstract
Vertical electrical soundings (VES) have been used
to estimate transmissivity of aquifers in Matuu,
Kenya.
The Schlumberger configuration was used for geo
electrical data acquisition. The half–currents
electrode (𝐴𝐴𝐵𝐵/2) spacing ranged from 1.5m to
200m.The quantitative interpretation of the VES
curves involved the use of partial curve matching
and the 1-D computer iteration technique. The
depth sounding interpretation results were used to
generate geo-electric models from which the aquifer
was delineated. The geo-electric sections mostly
reveal a three layer formation of the A-type which
comprises the topsoil, weathered/semi-weathered
and fractured basement. The weathered/semi
weathered layers constitute the aquiferous zone in
all the stations.
Transmissivity (T) is one of the most important
parameters in determining groundwater potential; it
is generally estimated from pumping tests. In this
study the relation between hydraulic parameters and
geo-electrical parameters using both experimental
and theoretical data sets from Finland, Nigeria,
India and Egypt, have been tested on data from
Matuu.
Cross-plots of transmissivity and tranverse
resistance for data sets generated for Matuu from
these relationships showed good correlation. From
the foregoing the relationships developed from data
from Ondo state, Nigeria (theoretical) and West
coast Goa, India (experimental) have therefore been
used to estimate spatial variations of transmissivity.
It is hoped that this information would serve as a
useful guide to groundwater exploration in Matuu.