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Abstract

The work we present was motivated by our Geoscientists Without Borders (GWB) Project, which builds capability for the community in Myanmar to acquire and interpret direct current (DC) resistivity data to find groundwater resources. For this, we improved the DC portion of the existing open-source geophysical software module, SimPEG-DC. Our main goal was to generate 1D and 2D inversion software that local engineers and students could readily run within a reasonable amount of time (less than 5 minutes) using their own computers. Three main improvements were: (a) the development of the 1D layered-earth solution for DC, (b) the implementation of semi-structured meshes in 2D and 3D, and (c) a novel projection methodology which reduces any electrode configuration to unique pole-pole source-receiver pairs within a DC survey for forward modelling and sensitivity calculations. To highlight the impact of our improvements, we applied 1D, 2D, and 3D inversions to field DC data sets obtained at Kawpiphtaw Village Mon State, Myanmar, and interpreted hydrostratigraphy of the region. For both the 2D and 3D codes, the reduction in runtime was at least a factor of 10 and memory usage was reduced; this allowed local users to run both 2D and 3D inversions within several minutes.

Presentation Date: Wednesday, October 14, 2020

Session Start Time: 9:20 AM

Presentation Time: 9:20 AM

Location: Poster Station 5

Presentation Type: Poster