Vertical electrical
sounding is a geophysical method for investigation of a geological medium, the
method is used on the estimation of the electrical conductivity or resistivity
of the medium. The estimation is performed based on the measurement of voltage
of electrical field induced by the distant grounded electrodes (current
electrodes). The following methods are used to carry out experiment in vertical
electrical sounding;
v Wenner
array (2D)
v Schlumberger
array (1D)
v Dipole-dipole
array
v Square
array
AIM
1.
To determine the potential difference
and current passing.
2.
To know the depth of water level in an
area of mapping and to know the aquifer level of an area.
3.
It also determines the type of soil that can
be used for building structures in a certain area.
4.
To know the type of crops that will be
grown in that area.
APPARATUS
USED
1. Tetrameter 300
2. Cable (blue =
current wire and white/red = potential wire)
3. 5 Electrodes
4. Hammer
5. Masking tape
C = Current electrode
(AB)
P = Potential electrode
(MN)
Midpoint:
This is the stationary point where the two point of meter tap start.
Traverse:
A strength line to enhance a work, or a direction o part the meter tap follows
(different direction, right and left direction).
Tetrameter: The instrument
that measures or gives reading in resistance. Resistance (R) = 1
V
The
tetrameter machine has to read 4 times before taking the reading, this is
because we place the sounding cycle at 4.
Schlumberger
array:
Steps
in the determination of Schlumberger Array
1. Location of mapping.
2. Take one electrode and make a stationary
point with a meter tape.
3. Connect the various cable to the current
and potential.
4. Test the tetrameter SAS 300 if it’s
producing or taking reading.
5. From the data given, we extend the
current to different position while the potential remains.
6. Records are taken after every point of
current and potential.
FIELD
WORK
Cricket court off UBA
Bank
GPS READING: 4° 53° 52°N
6° 55° 9°E
To get the geometric
factor (K)
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