A 3D inversion algorithm using a triple mesh approach and domain-decomposition for fast computations

K. W. Engebretsen, B. Zhang, G. Fiandaca, E. Auken

Research output: Contribution to conferencePaper at conferencepeer-review

Abstract

With the computer power available today full 3D inversions of transient electromagnetic data (TEM) is no longer a dream of the past. Although it is possible to perform these inversions, the problems still scale in three dimensions making large datasets slow to invert. We here propose a new triple mesh method for inverting TEM datasets with multiple transmitters and multiple receivers per transmitter. The code is relative fast and with a manageable memory consumption. In this new approach we show that by using a decoupled regular structured model mesh and two finite element forward meshes, one with a coarse discretization and one with a fine discretization, we get a substantial speed up in calculations times without sacrificing much in terms of how well we fit the data. We show that we can invert large datasets by decomposing our domain and applying this triple mesh method on each domain separately.

Original languageEnglish
Publication statusPublished - 2019
Event25th European Meeting of Environmental and Engineering Geophysics, Held at Near Surface Geoscience Conference and Exhibition 2019, NSG 2019 - The Hague, Netherlands
Duration: 8 Sep 201912 Sep 2019

Conference

Conference25th European Meeting of Environmental and Engineering Geophysics, Held at Near Surface Geoscience Conference and Exhibition 2019, NSG 2019
Country/TerritoryNetherlands
CityThe Hague
Period8/09/1912/09/19

Programme Area

  • Programme Area 2: Water Resources

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