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

Volume 15 , Issue 1 , December 2013 , Pages 143-158

Authors

¹ Faculty of Science and Education University of Sulaimani

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.

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