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ELRIS2D: A MATLAB Package for the 2D Inversion of DC Resistivity/IP Data

Akca I.

Acta Geophysica

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2016

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Vol. 64, no. 2

443--462

EN

ELRIS2D is an open source code written in MATLAB for the twodimensional inversion of direct current resistivity (DCR) and time domain induced polarization (IP) data. The user interface of the program is designed for functionality and ease of use. All available settings of the program can be reached from the main window. The subsurface is discretized using a hybrid mesh generated by the combination of structured and unstructured meshes, which reduces the computational cost of the whole inversion procedure. The inversion routine is based on the smoothness constrained least squares method. In order to verify the program, responses of two test models and field data sets were inverted. The models inverted from the synthetic data sets are consistent with the original test models in both DC resistivity and IP cases. A field data set acquired in an archaeological site is also used for the verification of outcomes of the program in comparison with the excavation results.

2

Numerical evaluation of 2D electrical resistivity tomography for subsoil investigations

Pasierb B.

Czasopismo Techniczne. Środowisko

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2015

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Y. 112, iss. 2-Ś

101--112

EN

The use of numerical methods for the design and analysis of hydraulic engineering structures requires an accurate determination of the model of subsoil structure. The article presents one of the geophysical methods – electrical resistivity tomography (ERT), which allows for precise, spatially instant recognition of the substrate and the phenomena occurring within it. The methodology, the applied algorithm for numerical calculation, and data processing procedure are discussed. This article also introduces a method of inversion which relies on finding the actual model and presents examples of its application.

PL

Zastosowanie metod numerycznych do projektowania oraz analizy konstrukcji hydrotechnicznych wymaga określenia modelu budowy podłoża. W artykule zaprezentowano metodę tomografii elektrooporowej ERT stosowaną dzięki ciągłemu, przestrzennemu rozpoznaniu podłoża i zjawisk w nim zachodzących, m.in.: w geotechnice, hydrotechnice, a także w zagadnieniach obejmujących projektowanie konstrukcji inżynierskich. Przedstawiono metodologię, stosowane algorytmy do obliczeń numerycznych oraz procedury przetwarzania danych. Przybliżono metodę inwersji polegającą na znalezieniu modelu rzeczywistego ośrodka oraz zaprezentowano przykłady jej stosowania.

3

2D Electrical Resistivity Tomography interpretation ambiguity - example of field studies supported with analogue and numerical modelling

Bania G., Ćwiklik M.

Geology, Geophysics and Environment

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2013

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Vol. 39, no. 4

331--339

EN

Single Electrical Resistivity Tomography (ERT) survey was carried out in the Manor and Park Complex in Nowa Huta (Krakow Branice, Poland). It was applied at a small distance and parallel to the longer wall of a monumental building containing an empty 3 m deep basement. Analogue modelling was performed in order to recreate the field study at the proper scale. The laboratory set-up consisted of a water tank where electrodes were mounted to the particular plate, which rested on water surface. The basement model was made out of a non-conducting material. The default and robust inversions were tested and these variants were also considered with the use of numerical modelling. Laboratory experiments have confirmed that zones visible in the interpreted field section are caused by the influence of the building cellar located next to the survey line. Zones of this kind are additionally disturbed by the local geological structure. The experiment has pointed out, among others, that as the distance between the survey line and the underground body increases, the inversion results are still burdened by an object influence. Thus, similar situations can be verified with the use of analogue modelling presented in this paper or 3D numerical one.