Hydrogeological Study in Tongchuan City Using the Audio-Frequency Magnetotelluric Method

Tongchuan City, located in Shaanxi Province, northwest China, has limited groundwater resources. Rational planning and exploitation of are crucial to the sustainable development city, for which investigating distribution is premise. Traditional resistivity sounding methods often used detect groundwater; however, these not applicable study area where thick Quaternary loess extensively distributed. In this study, we arranged five audio-frequency magnetotelluric (AMT) profiles deep clastic rock carbonate karst fissure Tongchuan. Firstly, analyzed electromagnetic interference (EMI) noises revealing that main EMI power frequency (PFI). We dictionary learning processing technology suppress PFI. Secondly, two-dimensional (2D) nonlinear conjugate gradient method was employed invert a 2D electrical structure model shallower than 1 km. characteristics its geological significance. Lastly, three-dimensional (3D) inverted using 3D method, spatial water-bearing strata were further analyzed. The results show PFI urban environment can be suppressed by technology. water controlled folds faults, as well thickness sandstone layers, mainly faults. On basis, infer areas middle east south area.