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Course, academic year 2024/2025
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Geoelectrical prospecting - MG452P23
Title: Geoelektrický průzkum
Czech title: Geoelektrický průzkum
Guaranteed by: Institute of Hydrogeology, Engineering Geology and Applied Geophysics (31-450)
Faculty: Faculty of Science
Actual: from 2020
Semester: summer
E-Credits: 4
Examination process: summer s.:
Hours per week, examination: summer s.:2/1, C+Ex [HT]
Capacity: unlimited
Min. number of students: 2
4EU+: no
Virtual mobility / capacity: no
State of the course: not taught
Language: Czech
Explanation: nahrazen MG452P43
Note: enabled for web enrollment
Guarantor: prof. RNDr. Tomáš Fischer, Ph.D.
Co-requisite : MG452P75
Is incompatible with: MG452P43
Opinion survey results   Examination dates   Schedule   
Annotation -
Basic equations of EM field, classification of geoelectrical methods. Resistivity method (sou-nding, profiling), multielectrode measurements, borehole variants of resistivity method. Mag-netotelluric method. Very low frequency method (inductive and resistivity variant). EM me-thods in frequency domain. Time domain EM methods. Georadar. Self-potential method. Induced polarization method.
Last update: Sedláčková Zdeňka, Mgr. (16.05.2013)
Literature - Czech

Reynolds J.M., An Introduction to Applied and Environmental Geophysics (kap. 3 a 4), John Wiley & Sons, N.Y., 1997.

Karous M., Geoelektrické metody průzkumu, SNTL, Praha, 1989.

Telford W.M., Geldart L.P., Sheriff R.E., Applied Geophysics (kap. 5, 6, 7, 8, 9), Cambridge University Press, Cambridge, 1990.

Last update: Sedláčková Zdeňka, Mgr. (16.05.2013)
Requirements to the exam - Czech

Závěrečná zkouška má písemnou a ústní část. K zápočtu je třeba odevzdat 5 vypracovaných protokolů.

Last update: Sedláčková Zdeňka, Mgr. (16.05.2013)
Syllabus -

1. Introduction - basic equations of EM field, types of EM fields, sources of geoelectrical fields, general measurement techniques, classification of geoelectrical methods.

2. Resistivity method - resistivity of rocks, basic theory of stationary electric field.

3. Resistivity sounding - direct problem, geoelectrical section, basic types of sounding curves, computation of theoretical curves, inverse problem, interpretation procedures.

4. Resistivity profiling - electrode arrays, direct problems, characteristic model curves, methodics of measurement, data processing, interpretation.

5. Multielectrode measurements - principle, methodics, application. Borehole variants of resistivity method - principles, modifications.

6. Magnetotelluric method - sources and character of MT field, EM induction in homogeneous halfspace, principle of MT sounding, sounding curves, interpretation.

7. VLF method - sources, signal propagation, origin of anomalies, elliptic polarization, inductive variant (methodics of measurement, characteristic curves, data processing, interpretation), VLF-R (principle, measurement, 2D inhomogeneities, two horizontal layers).

8. EM methods in frequency domain - quasistationary normal field of VMD and HED, principle of frequency sounding (far and near zone), EM profiling (principle, large source, moving source, conductivity meters).

9. Time domain EM methods - principle, origin of secondary field, normal field of loop and HED, near and far zone, transient sounding and profiling.

10. Georadar - principle of impulse georadar, central frequency, wave number, reflection, attenuation, wave length, methodics of measurement.

11. Self-potential method - natural electrochemical activity, origin of potentials, field measurements (potential, gradient), data processing, interpretation.

12. Induced polarization method - polarization of rocks, IP phenomenon, time domain IP (principle, measured parameters, methodics of measurement, interpretation), frequency domain IP ( amplitude-phase mesurements, spectral IP).

Last update: Sedláčková Zdeňka, Mgr. (16.05.2013)
 
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