Title :
Radiowave propagation in a coal seam with inhomogeneous rock walls
fDate :
5/1/1991 12:00:00 AM
Abstract :
An idealized slab model of a horizontal coal seam is adopted. The structure is laterally uniform, but the media within and outside the slab are allowed to be inhomogeneous in the vertical direction. A general mode equation is obtained, and simplifications are made to facilitate computation of the propagation constant of the dominant mode. Using an exponential variation of the rock conductivity, it is shown that the frequency dependence of the attenuation rate is strongest for a conductivity increasing with distance into the rock media
Keywords :
coal; geophysical prospecting; geophysical techniques; mining; radiowave propagation; terrestrial electricity; EM wave propagation; attenuation; coal mine; dominant mode; exponential variation; frequency dependence; general mode equation; geoelectric; horizontal coal seam; idealized slab model; inhomogeneous rock walls; measurement; propagation constant; prospecting; radiowave transmission; technique; Attenuation; Conductivity; Dielectric losses; Electromagnetic propagation; Electromagnetic scattering; Electromagnetic waveguides; Frequency; Propagation constant; Radiowave propagation; Slabs;
Journal_Title :
Geoscience and Remote Sensing, IEEE Transactions on
