Water Productivity Journal (WPJ) Quarterly Publication

Document Type : Original Research Paper


Assistant Professor, Academy of CSIR, Scientist, CSIR-National Geophysical Research Institute, Uppal Road, Hyderabad 500 007, India



The electrical conductivities of rocks and soils are highly dependent of the water saturation. Variations in electrical resistivity are monitored by time lapse electrical resistivity tomography (TLERT) during a long duration pumping test. This experiment is carried out in the Experimental Hydrogeological Park (EHP) located in Choutuppal, 45 km south-east of Hyderabad. Vadose zone of EHP comprises an uppermost thin layer of red soil (<1m), sandy regolith (1m-3m), saprolite (3 m – 15 m), and then the fissured granite. The pumping test lasts for 5 days and the piezometric variations are between 13 m and 18 m during pumping in CH03 borehole. This fissured granite is characterized by an important horizontal fracture density controlling the flow. An East West profile was laid with 48 electrodes and 3 m spacing interval. CH03, pumping well, was in the center of the profile covering 8 observation wells in both directions. 27 time-lapse datasets were inverted using Res2Dinv adopting least square inversions. The inverted resistivity datasets seem to be correlated with weathered profile and the variations of resistivity may be correlated with variation of hydraulic head. The variations of resistivity are more important close to CH03 and decreases with distance away from it. This behavior is coherent with the depression cone created by the pumping. Moreover, resistivity variations in the vadose zone highlight an influence of the pumping on the water content evolution of this zone. The observed heterogeneous response seems to be correlated with the geological media heterogeneity. TLERT appears to be a powerful tool to follow dynamic behavior of both saturated level and vadose zone for a given event. Grounwater punping monitoring helps to the water content evolution and groundwater productivity.


Main Subjects

Alamry Abdulmohsen, S., Mark van der Meijdeb, M.N., Elisabeth, A., Addinkc., Rik van, B., Steven, M. and de Jong. (2017). Spatial and temporal monitoring of soil moisture using surface electrical resistivity tomography in Mediterranean soils. Catena, 157: 388–396.
Al-Gamal, S.A. (2021). The potential impacts of climate change on groundwater management in west Africa. Water Productivity Journal, 1(3): 65-78.
Arora, T., Alexandre, B. and Shakeel, A. (2016). Non-intrusive Hydro-geophysical Characterization of the Unsaturated Zone of South India-A case study. Special Issue: Contributions of the Global Earth Sciences Integration. Journal of African Earth Sciences, 12(2): 88-97.
Arora, T. and Shakeel, A. (2011). Characterization of recharge through complex vadose zone of a granitic aquifer by time lapse electrical resistivity tomography. Journal of Applied Geophysics, 73: 35-44.
Binley, A. (2015). Tools and Techniques: Electrical Methods. Treatise on Geophysics, 233–59. https://doi.org/10.1016/B978-0-444-53802-4.00192-5.
Daily, W., Ramirez, A., Labrecque, D. and Nitao, J. (1992). Electrical Resistivity Tomography Of Vadose Water Movement. Water Resources Research, 28: 1429-1442.
Dutta, S., Krishnamurthy, N.S., Arora, T., Rao, V.A. Shakeel, A. (2006). Localization of water bearing fractured zones in a hard rock area using integrated geophysical techniques in Andhra Pradesh, India. Hydrogeology Journal, 14(5): 760-766.
LaBrecque, D.J. and Yang, X. (2000). Difference inversion of ERT data; a fast inversion method for 3-D in-situ monitoring, paper presented at Symposium on the Application of Geophysics to Engineering and Environmental Problems (SAGEEP), Environ. and Eng. Geophys. Soc., Arlington, Va, USA. Seaton, W.J. and Burbey, T.J. (2002). Evaluation of two-dimensional resistivity methods in a fractured crystalline-rock terrain. Journal of Appl. Geophys, 51: 21–41. Singha, K,F., Day-Lewis, D., Johnson, T. and Slater, L.D. (2015). Advances in interpretation of subsurface processes withtime-lapse electrical imaging. Hydrol. Process, 29: 1549-1576.
Ward, S.H. and Hohmann, G.W. (2002). Electromagnetic theory for geophysical applications Nabighian M.N. (Ed.), Electromagnetic methods in Applied Geophysics - Theory, 1, Society of Exploration Geophysicists, 1987: 130-311.
Ward, S.H. (1990). Resistivity and induced polarisation methods, in Geotechnical and Environmental Geophysics. Vol. 1, Edited by S. H. Ward, Soc. of Exp. Geophys, .147–189, Tulsa, Okla, USA.
Zhou, Q.Y., Shimada, J. and Sato, A. (2001). Three-dimensional spatial and temporal monitoring of soil water content using electrical resistivity tomography. Water Resour. Res, 37: 273–285.