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ＭＴ－ＶＬＦ法具有高分辨率，能提供对水和粘土敏感的电阻率参数。ＤＣ电法允许垂直纠正ＶＬＦ数据并显示调查深度和目标深度之间的相关性。将ＭＴ－ＶＬＦ法与ＤＣ电法结合应用，对一个已探查出的完全掩埋的岩溶通道进行了地球物理试验。在纠正初始场极化引起的形变后，ＭＴ－ＶＬＦ数据清楚地显示：在该场地中心部位，岩溶通道并不与异常轴相一致而与电导区和电阻区的边界一致。２Ｄ方法进一步证实直接探测该通道是不可行的。通道靠近完全由粘土充填的裂隙带相对应的电导带。这种情况在整个场地区可观察到。而且岩溶通道似乎系统地穿过电导带而与出口相连。导电裂隙带的分布和水力梯度方向是预测通道位置的两个重要的元素。３Ｄ方法增大了这种情形下寻找通道的可能性。
The MT-VLF method has high resolution and provides water and clay-sensitive resistivity parameters. The DC electrical method allows vertical correction of the VLF data and shows the correlation between the depth of investigation and the target depth. In combination with the MT-VLF method and the DC electrical method, a geophysical test of a fully buried karst channel has been performed. After correcting the initial field-induced deformation, the MT-VLF data clearly show that at the site’s center, the karst channel does not coincide with the anomalous axis and coincides with the boundary of the conductance and resistivity regions. 2D method further confirmed that direct detection of the channel is not feasible. The passageway is adjacent to the electrical conductivity band of the fracture zone that is completely filled with clay. This situation can be observed in the entire field area. Also karst passages appear to be systematically passed through the conduction band to connect with the outlet. The distribution of the conductive fracture zone and the direction of the hydraulic gradient are two important elements for predicting the position of the channel. The 3D method increases the likelihood of finding a channel in this situation.