Abstract

ARORA, Tanvi  and  AHMED, Shakeel. Contribution of geoelectric parameters to investígate the hydraulic characteristics of an aquifer in hard rock terrain. Ser. correl. geol. [online]. 2020, vol.36, n.1-2, pp.53-64. ISSN 1666-9479.

An attempt has been conducted to relate the electrical resistivity measurements with the transmissivity in the granitic aquifers of a watershed in the hard rock terrain of Andhra Pradesh state, India. Electrical sounding curves were interpreted and the electrical properties of the saturated zone were correlated with hydraulic conductivities and transmissivites obtained from slug tests. Earlier works support the direct relationship between the geoelectric and hydraulic parameters in the porous medium. Contrary to this, an inverse relationship is observed in the hard rock terrain (mainly granitic). Alternati-vely, the constitution of equivalent porous media with different combination of resistivities within the same thickness of the aquifer layer were also analyzed. All of them show a direct relationship between revised transverse resistance and transmissivity to some extent, thereby supporting the findings that in hard rock areas especially in granitic terrain, this direct relationship between transmissivity and transverse resistance do not exist. Establishing a global relationship between two parameters is not meaningful and has large errors, however, the empirical relationship between them could be very well established on a zonal basis. It is justifiable as hard rock aquifers are well known compartmented and hydrogeology is more heterogeneous.

Keywords : Dar-Zarrouk parameters; transmissivity; conductance; ERT.

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