Aquifer Characterization through Vertical Electrical Sounding (VES), Well Logging, Petrographic Analysis, and Pumping Tests in the Monitoring Well Area, Lampung
This study aims to develop a calibrated interpretation framework for aquifer characterization and optimal monitoring well design at the Institut Teknologi Sumatera campus in South Lampung, Indonesia. This study employs the Vertical Electrical Sounding (VES) method using a Schlumberger configuration, with inversion processing performed to obtain a subsurface resistivity model. Dar-Zarrouk parameters were calculated to estimate aquifer hydraulic properties and were supported by well logging data and petrographic analysis for lithological identification, as well as Cooper–Jacob pumping tests for determining hydraulic parameters. The inversion results identify four subsurface layers, with the main aquifer occurring at depths greater than 75 m and characterized by resistivity values ranging from 40.49 to 71.28 Ωm. Based on well logging and petrographic analysis, two productive aquifer zones are identified at depths of 85–90 m and 110–125 m, consisting predominantly of coarse sand with minor gravel content. The Dar-Zarrouk parameter analysis indicates that the hydraulic conductivity, longitudinal conductance, transverse resistance, and transmissivity values reflect aquifer characteristics with moderate to high groundwater potential. Pumping test analysis yields a transmissivity value of 0.0051 m2/s and a hydraulic conductivity value of 9.30 × 10⁻⁵ m/s. The resulting hydrogeological model indicates that the aquifer system in the study area is classified as a confined aquifer. The integrated approach effectively reduces interpretive ambiguity, and well screen installation at depths of 90–120 m is recommended as the optimal interval for groundwater monitoring within volcanic aquifer systems.
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