Test of the maximum penetration depth of the Roteg GPR above the Hranice Abyss and in the Moravian Karst

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F62156489%3A43210%2F20%3A43919468" target="_blank" >RIV/62156489:43210/20:43919468 - isvavai.cz</a>

Výsledek na webu

<a href="https://doi.org/10.5817/GVMS2020-13587" target="_blank" >https://doi.org/10.5817/GVMS2020-13587</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.5817/GVMS2020-13587" target="_blank" >10.5817/GVMS2020-13587</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Test of the maximum penetration depth of the Roteg GPR above the Hranice Abyss and in the Moravian Karst

Popis výsledku v původním jazyce

A new kind of Ground Penetrating Radar (GPR), &quot;Roteg&quot;, was tested at generally known speleological sites in the Czech Republic. The first examined site - the Hranice Abyss located near the town Hranice - is the deepest underwater cave in the world. This GPR is characterised by much higher pulse power, antennas with rather high voltage (5-15 kV), and, in particular, the special design of the pulse generator. The radar survey near the Hranice Abyss has shown that it is possible to detect reflections of electromagnetic pulses coming from the speleogenic structures of the abyss itself and from lithological boundaries occurring below the water table - something which was not anticipated and was verified for the first time ever. Plausibly detectable reflections were detected from the depths of 580m below the surface - which is approximately 515m below the water level - using the longest available 6-metre antennas tuned to the frequency of 25 MHz. The second site tested was the quarry of Malá Dohoda near the municipality of Holštejn, the Moravian Karst, the Czech Republic. The GPR used was the same as above except the power output to the transmitting antenna which produced pulses of 20 kV. The radarogram showed cavities located at the depth of up to 300m, the layers on the boundary between Lažánky and Vilémovice members of limestone at the depth of 400m, basement sandstones and conglomerates at the depth of 600-700m, and granite rocks below this level. Both of the tests mentioned above confirmed the extraordinary big penetration depth of the GPR signal which exceeded 500m when using the maximum power on transmitting antennas.

Název v anglickém jazyce

Test of the maximum penetration depth of the Roteg GPR above the Hranice Abyss and in the Moravian Karst

Popis výsledku anglicky

A new kind of Ground Penetrating Radar (GPR), &quot;Roteg&quot;, was tested at generally known speleological sites in the Czech Republic. The first examined site - the Hranice Abyss located near the town Hranice - is the deepest underwater cave in the world. This GPR is characterised by much higher pulse power, antennas with rather high voltage (5-15 kV), and, in particular, the special design of the pulse generator. The radar survey near the Hranice Abyss has shown that it is possible to detect reflections of electromagnetic pulses coming from the speleogenic structures of the abyss itself and from lithological boundaries occurring below the water table - something which was not anticipated and was verified for the first time ever. Plausibly detectable reflections were detected from the depths of 580m below the surface - which is approximately 515m below the water level - using the longest available 6-metre antennas tuned to the frequency of 25 MHz. The second site tested was the quarry of Malá Dohoda near the municipality of Holštejn, the Moravian Karst, the Czech Republic. The GPR used was the same as above except the power output to the transmitting antenna which produced pulses of 20 kV. The radarogram showed cavities located at the depth of up to 300m, the layers on the boundary between Lažánky and Vilémovice members of limestone at the depth of 400m, basement sandstones and conglomerates at the depth of 600-700m, and granite rocks below this level. Both of the tests mentioned above confirmed the extraordinary big penetration depth of the GPR signal which exceeded 500m when using the maximum power on transmitting antennas.

Druh

J_SC - Článek v periodiku v databázi SCOPUS

CEP obor

—

OECD FORD obor

20201 - Electrical and electronic engineering

Projekt

—

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2020

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Geologické výzkumy na Moravě a ve Slezsku

ISSN

1212-6209

e-ISSN

—

Svazek periodika

27

Číslo periodika v rámci svazku

1-2

Stát vydavatele periodika

CZ - Česká republika

Počet stran výsledku

8

Strana od-do

98-105

Kód UT WoS článku

—

EID výsledku v databázi Scopus

2-s2.0-85103333522