Shallow groundwater exploration by frequency selection method of telluric current in interference environment of high voltage transmission lines
The influence of human environmental factors on exploration is often unavoidable in the practical application of engineer-ing geophysics.Herein,the application effects of the frequency selection method(FSM)of telluric current in groundwater explora-tion near high-voltage transmission lines were discussed.Firstly,a brief introduction was given to the causes of static effects,and 2D finite element forward simulation of natural electromagnetic methods was carried out.Simulation results show that significant static shift characteristics of the horizontal electric field components along the measurement line will be observed when there is a rela-tively low resistance anomalous body near the surface.Secondly,FSM was applied to groundwater exploration in two locations to verify its effectiveness under interference from high-voltage transmission lines.The measured results of which were used to demon-strate that the main cause of FSM anomalies was the static shift.According to theoretical simulation and practical applications,it is known that the measured profile curves and pseudo-sections of FSM will have obvious static shift,which are similar to the theoreti-cal simulation results.At the same time,successful application results can also be achieved as long as the direction of the measure-ment line is parallel to that of the transmission line in high voltage interference environments,which provides an optional geophysical method for future applications in similar environments.
groundwaterstatic shiftfrequency selection method(FSM)electromagnetic interferencenatural electromagnetic methodfinite element method
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维普
