The 2D resistivity imaging method in mountainous area over different slope

Abstract

Assessing the reliability of the 2D electrical resistivity imaging method is investigated in
 mountainous areas. Several profiles are surveyed on different surface slopes ranging
 between 17° to 55° degrees. Two types of electrode arrays with different electrode spacing
 (2.0, 3.0 and 5.0 meters) are used. Repeated measurements are carried out for each profile
 by using different field parameters such as data density, pulse duration and voltage. The
 inverse sections are compared with the drilled bore holes in the area. The results show
 that the 2D resistivity imaging works well in the mountainous area when suitable field
 parameters are selected. The study has proved that the inverse sections are highly
 sensitive to the number of data points. The optimal number of data points has direct
 relation with surface slope, number of electrodes and electrode spread. On the other hand
 pulse durations and voltages magnitude have no significant effects on the quality of the
 field data. An empirical equation is suggested for the optimal acceptable number of data
 points that has a direct relation to the profile length, number of electrodes, electrode
 spacing and angle of the slope.