Inversion characteristics of high-density resistivity method on karst conduits at varied depths
ZHENG Zhi-jie
GAN Fu-ping
ZENG jie
Abstract：The high-density resistivity method is effective in searching for water in karst areas.As karst con-duits in mountainous areas are at different depths,it is necessary to study the characteristics and rules of this method in such an environment.This work is based on the principle of the high-density electrical method. Using a high-density micro-electrical measurement system and the copper cylinder model,it simulates the re-sponse characteristics of the high-density resistivity method for different depths of karst conduits in a homo-geneous medium.The results indicate that when the depth of karst conduits exceeds 15 times of the electrode spacing,the AMN and the MNB device cannot detect these conduits.When the depth of karst conduits is less than 10 to1 1 times of the electrode spacing,the combination of the AMN device and MNB device can precisely locate the horizontal position of the karst conduits.The transverse width of karst conduit inversion anomalies are always greater than the transverse width of the true anomalies.The buried depth of inversion anomalies are less than or equal to the true ones.And the shallower of the karst conduits,the closer of the inversion of anomaly body shape,size,and depth to the true anomalies.With the increasing of the depth of karst conduits,the forms of AMN device and MNB device inversion anomalies change from ellipse to semi-el-lipse,then to bow till they disappear.
Keywords：high density electrical method micro-electrical measurement systemelectrode spacingdepth of karst conduitphysical simulation experiment
Publication Date：2015-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：6( 292-297 )