地球动力学

IF 1 Q3 GEOCHEMISTRY & GEOPHYSICS Geodynamics Pub Date : 2023-06-01 DOI:10.23939/jgd2022.02.075
P. Kalenda, R. Tengler
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引用次数: 0

摘要

本研究的目的是验证新开发的地质雷达在岩溶地区的实际条件下具有非常大的理论穿透深度。新型探地雷达(GPR)——Roteg——于2013年研发(RTG Tengler 2013)。其技术参数(发射天线上的脉冲峰值20kV或以上,接收天线的灵敏度至少为2uV,即20uV左右的真实信号检测电平)表示真实信号检测灵敏度为9个数量级,即180dB。这种灵敏度意味着实际穿透深度应该比普通探地雷达的情况大两个数量级。我们在适当的环境条件下测试了摩拉维亚喀斯特洞穴和斯洛文尼亚Postojna洞穴附近的实际穿透深度。测量结果表明,在地表以下40-210米的深度,可以可靠地检测到已知洞穴的反射。在Hraniká深渊上方的剖面上,可以观察到高达480米的地质结构反射,其中可能是Lift II的底部。在没有土壤覆盖的喀斯特(在摩拉维亚喀斯特的MaláDohoda采石场)的最佳条件下,发射天线上有20千伏脉冲的新型Roteg georadar能够检测到深度高达850米的德文-布尔诺花岗岩接触的反射。雷达图显示,Vilémovice–Lažánky石灰岩和石灰岩地层底部的碎屑层之间的岩性发生了变化。上述两项测试都证实了在岩溶条件下,当发射天线使用最大功率时,探地雷达信号的穿透深度超过500米。一种名为Roteg的新型探地雷达,其发射天线上具有极高的电压,发射信号的脉冲而非谐波信号生成使其穿透深度比普通探地雷达大两个数量级。。新型Roteg探地雷达可以从以前只能通过地震方法或钻孔获得的深度获得数据(尤其是岩溶地区的数据)。探地雷达测量在现场成本低几个数量级,速度快得多。
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GEODYNAMICS
The purpose of the research was to verify the extraordinary big theoretical penetration depth of new developed georadar in the real conditions of karsts areas. The new kind of the Ground Penetrating Radar (GPR) – Roteg – was developed in 2013 (RTG-Tengler 2013). Its technical parameters (pulse peak on the transmitting antenna 20 kV or more, and the sensitivity of the receiving antenna at least 2 uV, i.e. the real signal detection level around 20 uV) express that the real signal detection sensitivity is 9 orders, i.e. 180 dB. Such sensitivity means that the real penetration depth should be two orders bigger than in the case of common GPR´s. We tested the real penetration depths in the suitable environmental conditions over the caves in the Moravian Karst and in Slovenia near Postojna cave. The measurements results showed that reflections from known caves are reliably detectable at depths of 40-210 m below the surface. Reflections from the geological structures up to a depth of 480 m, in which the bottom of Lift II is probably located, were observable on the profile above the Hranická abyss. The new kind of Roteg georadar with 20 kV pulses on the transmitting antennas was able to detect reflections from the Devon – Brno Granite contact at a depth of up to 850 m in the case of optimal conditions in the karst without soil cover (in the Malá Dohoda quarry in the Moravian Karst). The radarogram showed a change in the lithology between the Vilémovice – Lažánky limestone and layers of clasts in the bottom of limestone strata. Both of the tests mentioned above confirmed the extraordinary big penetration depth of the GPR signal which exceeded 500 m in karst conditions when using the maximum power on transmitting antennas. The quite new kind of GPR called Roteg with the extraordinary high voltage on transmitting antenna and pulse instead of harmonic signal generation of transmitted signal allows reach two orders bigger penetration depths than the common GPRs.. The new kind of Roteg GPR makes it possible to obtain data (especially from karst areas) from depths that were previously only accessible by seismic methods or boreholes. GPR measurements are orders of magnitude cheaper and much faster in the field.
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来源期刊
Geodynamics
Geodynamics GEOCHEMISTRY & GEOPHYSICS-
自引率
33.30%
发文量
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GEODYNAMICS GEODYNAMICS GEODYNAMICS GEODYNAMICS GEODYNAMICS
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