Mapping Structures that Control Contaminant Migration using Helicopter Transient Electromagnetic Data

2010 ◽  
Vol 15 (2) ◽  
pp. 65-75 ◽  
Author(s):  
L. Pellerin ◽  
L. P. Beard ◽  
W. Mandell
Keyword(s):  
Contaminant Migration ◽  
Electromagnetic Data ◽  
Transient Electromagnetic ◽  
Mapping Structures

scholarly journals An Express Algorithm for Transient Electromagnetic Data Interpretation

Electronics ◽  
2020 ◽  
Vol 9 (2) ◽  
pp. 354 ◽  
Author(s):  
Roman Kaminskyj ◽  
Nataliya Shakhovska ◽  
Gregus Michal ◽  
Borys Ladanivskyy ◽  
Lidia Savkiv
Keyword(s):  
Experimental Data ◽  
Spline Approximation ◽  
Numerical Differentiation ◽  
Data Interpretation ◽  
Continuous Functions ◽  
Electromagnetic Data ◽  
Polynomial Coefficients ◽  
Transient Electromagnetic ◽  
1D Model ◽  
Tem Method

The transient electromagnetic (TEM) method is a time-domain, controlled source, electromagnetic (EM) geophysical technique which is often applied to image the subsurface conductivity distributions of shallow layers due to its effectiveness and adaptability to complex site working conditions. The means for an express analysis of such experimental data in several practical cases have advantages and are suitable for use. We developed our approach for determining the approximate one-dimensional (1D) model of background conductivity based on the formal transformation of the TEM experimental data and the mathematical analysis of continuous functions. Our algorithm, which allows the 1D model’s parameters to be obtained in terms of a layer’s thickness and resistivity, widely utilizes the numerical differentiation of experimental curves as well as of transformed ones. Since the noise level increases with time in the attenuating TEM signals and differentiation even enhances it, special procedures are required to calculate the derivative values. We applied the piecewise cubic spline approximation to solve this problem. In that case, the derivatives are obtained using polynomial coefficients which are available for each node. The application of the created facilities is demonstrated using real experimental data of the TEM soundings.

Unambiguous apparent conductivity for fixed-loop transient electromagnetic data

2006 ◽  
Vol 37 (4) ◽  
pp. 348-354 ◽  
Author(s):  
R. Schaa ◽  
J.E. Reid ◽  
P.K. Fullagar
Keyword(s):  
Electromagnetic Data ◽  
Apparent Conductivity ◽  
Transient Electromagnetic

scholarly journals New method for denoising borehole transient electromagnetic data with discrete wavelet transform

2019 ◽  
Vol 168 ◽  
pp. 41-48 ◽  
Author(s):  
Xueping Dai ◽  
Li Zhen Cheng ◽  
Jean-Claude Mareschal ◽  
Daniel Lemire ◽  
Chong Liu
Keyword(s):  
Wavelet Transform ◽  
Discrete Wavelet Transform ◽  
New Method ◽  
Discrete Wavelet ◽  
Electromagnetic Data ◽  
Transient Electromagnetic
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