Abstract

The flow characteristics of the moisture through the unsaturated zone remain an enigma for the scientific understanding and groundwater management as process are comparatively complex. Prediction of moisture movement through the unsaturated medium is an important issue in hydrology as it helps in estimating recharge to ground water system. However, the variability of moisture in the unsaturated zone is not easy for determining by simple experiments. Thus the indirect methods such as determining the electrical resistivity of the unsaturated zone are studied with every moisture change. The variability of moisture content is conditioned by the variability of electrical resistivity measurements through Electrical Resistivity Tomography (ERT) and calculated their variability. In the present work the influence of natural recharge on the correlation structure of resistivity data is been documented by the variogram analysis of the electrical resistivity imaging data. The study clearly shows the nonuniform distribution of the moisture in the vertical profile following the rainfall infiltration and the same has been characterized by the variographic analyses