Electrical structure of an unsaturated zone related to hard rock aquifer

摘要

The flow characteristics of moisture through the unsaturated zone remains an enigma for scientific understanding and groundwater studies. Prediction and modelling of moisture movement through unsaturated medium forms an important aspect in hydrology as it helps estimating the recharge to groundwater system. Electrical resistivity measurements through time lapse electrical resistivity tomography provide a means to study the variability of moisture content as a function of time. In the present study, the influence of natural recharge on the correlation structure of resistivity data has been studied over a typical hard rock aquifer. This study shows the non-uniform distribution of moisture in the vertical profile following the rainfall.