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Exploring and Modelling the Qanat Gallery Path Using Electrical Resistivity Tomography Data
- Publisher: European Association of Geoscientists & Engineers
- Source: Conference Proceedings, 1st Conference on Geophysics for Infrastructure Planning Monitoring and BIM, Sep 2019, Volume 2019, p.1 - 5
Abstract
Applying different optimal methods like Semi-Newton method results in modelling as well as interpreting the acquired data. Tikhonov regulation parameter was used for minimizing the objective function. The present study was conducted to explore and model the path and depth of the qanat gallery, bedrock and water table with sufficient resistivity compared to its surrounding area using electrical tomography data. According to the deep targets, the acquisition of data was made by using Schulmberger array with 3 profiles and 12 soundings. For inverting the data and constructing a 3D model of them, IPI2WIN software and VOXLER software were used respectively. The results revealed that as the qanat was water bearing the direction of its gallery path was from the southwest to the northeast at an approximate depth of 10 meters and with the electrical resistivity of about 100-ohm meter. According to the geological information, the bedrock was dolomitic having the electrical resistivity of almost 550-ohm meter compared to the surrounding area. The water table was about 16 meters being lower than the qanat gallery. The size of grains belonging to quaternary sediments were estimated as well.