SubjectsSubjects(version: 964)
Course, academic year 2024/2025
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Geoelectrical prospecting - MG452P43
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 2024
Semester: summer
E-Credits: 6
Examination process: summer s.:
Hours per week, examination: summer s.:3/2, C+Ex [HT]
Capacity: unlimited
Min. number of students: unlimited
4EU+: no
Virtual mobility / capacity: no
State of the course: taught
Language: Czech
Explanation: Výuka bude probíhat podle rozvrhu (úterý 9-13:00) od 15.2.2022
Note: enabled for web enrollment
priority enrollment if the course is part of the study plan
Guarantor: prof. RNDr. Tomáš Fischer, Ph.D.
Teacher(s): prof. RNDr. Tomáš Fischer, Ph.D.
Mgr. Jan Valenta, Ph.D.
Incompatibility : MG452P23
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: DATEL (30.04.2002)
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: DATEL (06.05.2004)
Requirements to the exam - Czech

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

Last update: Fischer Tomáš, prof. RNDr., Ph.D. (03.01.2012)
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: DATEL (06.05.2004)
 
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