ground conductivity


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ground conductivity

[′grau̇nd ‚kän·dək¦tiv·əd·ē]
(electricity)
The effective conductivity of the ground, used in calculating the attenuation of radio waves.
References in periodicals archive ?
the broad objective of these works is to carry out a thorough geophysical survey consisting of electro magnetic ground conductivity mapping and seismic refraction profiles investigation of each and every natural grass playing surface of dun laoghaire rathdown co.
In addition, when the ground conductivity is 0.005 S/m, the strong electromagnetic wave reflected from the DBC leads to an enormous deviation in the numerical solution, whereas the CFS-PML still exhibits good absorption; in this case, the average relative errors of the DBC and CFS-PML are 42.9% and 4.17%, respectively.
The penetration depth is dependent on various factors but mostly the ground conductivity and the EM wave frequencies (Yaccup and Brabham, 2012), when the quality of data acquired is influenced by the ambient electromagnetic noise.
Here a Hertzian (small) dipole with dipole moment p directed to positive X axis, at altitude xo above the infinite, flat and lossy ground, radiates time-harmonic electromagnetic (EM) waves at angular frequency [omega] = 2[pi]f Here the relative complex permittivity of the ground is [[epsilon]'.sub.r] = [epsilon]'/[[epsilon].sub.0] = [[epsilon].sub.r] + i[sigma]/[omega][[epsilon].sub.0], a being the ground conductivity, f the frequency of radiation and [[epsilon].sub.0] = 8,854 x [10.sup.-12] F/m is the absolute permittivity in vacuum or air.
[14] Geonics, EMD38-DD Ground Conductivity Meter-Dual Dipole Version, Geonics, Ontario, Canada, 2005.
As can be seen in [25], it is difficult to reduce the peak transient grounding resistance (P-TGR) value by increasing the number of the grounding electrode or improving the topology of the grounding system at the assumed ground conductivity and permittivity.
Ground conductivity meters for environmental site evaluation.
The measurements are then analyzed using a mathematical heat transfer model to estimate ground conductivity and borehole resistance values.
The effects of ground conductivity and field distortions are accommodated in the real-lime processing.
The electromagnetic method of geophysical observation was carried out using a ground conductivity meters Geonics EM31.
In this application it is typically only used as a guide and is often carried out in conjunction with other tools such as ground conductivity.
McNeill (1980) presented the theoretical basis for the use of electromagnetic (EM) ground conductivity meters to map lateral variation in subsurface electrical conductivity.
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