Environmental Engineering Reference
In-Depth Information
Kamareddi Kandrika
Ji Palem
10 ^ 3
10 ^ 3
10 ^ 2
10 ^ 2
10 ^ 1
10 ^ 1
10 ^ 0
10 ^ 0
10 ^ 0
10 ^ 1
10 ^ 2
10 ^ 3
10 ^ 0
10 ^ 1 10 ^ 2
Current Electrode Distance (AB/2) [m]
Renigunta Mandal
10 ^ 3
Current Electrode Distance (AB/2) [m]
Chandragiri Mandal
OTERU
10 ^ 4
10 ^ 3
10 ^ 2
10 ^ 1
10 ^ 0
10 ^ 1
10 ^ 2
10 ^ 3
Current Electrode Distance (AB/2) [m]
Tirupathi Rural Mandal
Fig. 3 Interpreted curves
Dar-Zarrouk Parameters
Maillet ( 1947 ) termed the Dar-Zarrouk parameters as D.Z. parameters. T is the resis-
tance normal to the face, and S is the conductance parallel to the face for a unit cross-
sectional area, which plays an important role in resistivity soundings. D.Z. parameters
are sufficient to compute the distribution of surface potential and, therefore, an elec-
trical resistivity graph. For example, in a cross section of the unit prism from a layer
extending laterally, whose resistivity is ˁ (in ohm-m) and thickness is h (in m), the
resistance normal to the face of the prism is the transverse unit resistance ( T mea-
sured in ohm-m 2 ). The conductance parallel to the face of the prism is the longitudi-
nal unit conductance ( S , measured in mho, or micro siemens) and are given by
Th S
=×ρ
and
= ρ/
h
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