We used the high density electricity method to detect underground water conveyance tunnel in a project, then we compared the difference of apparent resistivity profiles between Schlumberger device and Winner device.

Lastly, we analyzed the difference between the combined inversion method and the Levenberg-Marquardt method in Res2dinv software, and inferred the trend and depth of underground water tunnel through the results of electrical detection. in res2dinv when i inverting data, length is higher then length of my surveys on earth. Commercially available Res2dinv software was used for all inversion procedures. Several conclusions are drawn as follows. for example i have 32 meter length and in inverted file length is 48 meter. The inversion parameters were set based on expected subsurface geology, quality of measured data, type of electrode array and expected resolution of the inverse models. Firstly, the resistivity anomaly of underground tubular object is more prominent in Schlumberger device than in Winner device. Secondly, the Levenberg-Marquardt inversion method which contained in Res2dinv software can easily conceal the horizontal resistivity variation characteristics of small-scale tubular anomalous body and the horizontal resolution of the original apparent resistivity profile is higher than that of the inversion result. An electrical resistivity (ER) survey was conducted in a cemetery located on private ground in Lincoln County, Kansas.

Model refinement in RES2DINV allowed for the analysis of a reduced electrode spacing of. Thirdly, the combined inversion method can improve the horizontal resolution of resistivity method for detecting tubular anomalous body with larger burial depth and smaller scale. The RES2DINV checks for inconsistencies in the measured apparent.