Applying electromagnetic wave velocity singly for karst survey

there are limilations because of multiple solutions

and so does attenuation tomography technology. And the veracity is reduced. Based on the electric differences between karst cave and ambient medium，which are directly reflected by resistivity and relative dielectric constant

theories of resistivity and relative dielectric constant tomography are put forward

depending on the theories of electromagnetic wave velocity and attenuation tomography. Furthermore

it is applied to project. It is proved that the technology

relying on resistivity of electromagnetic wave and tomography of relative dielectric constant

is doable by analyzing four parameters

such as electromagnetic wave velocity

attenuation

relative dielectric constant and resistivity. A method of multi-parameter tomography compositive analysis is formed. As a result

the veracity of applying tomography by electromagnetic wave for detecting karst cave and it’s filling increases.