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Title: GPR STUDIES OF THE THERMOCLINE ON FRESH-WATER LAKES
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GPR STUDIES OF THE THERMOCLINE ON FRESH-WATER LAKES
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1314-2704
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English
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19
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1.1
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A thermocline is a layer of water in which a vertical temperature gradient is observed. On freshwater lakes, it is caused by seasonal warming of the surface layer. In the absence of wind mixing, the upper water layer is heated relatively uniformly, the temperature in the lower layer does not change. The temperature transition between the surface and bottom layers creates a thermocline. Since a change in water temperature leads to a change in its electrical conductivity and dielectric constant, a thermocline can be detected using ground penetrating radar (GPR), a method based on recording short electromagnetic pulses reflected from the boundaries of layers with different electrical properties. That is why GPR can be effectively used in hydrological studies.
Studies of thermocline with GPR have been conducted for several years on freshwater lakes in Karelia, Russia. The OKO-2 instrument with a 150 MHz antenna unit was used, which was placed in an inflatable boat. Data on the water temperature were collected by a special thermistor chain at the same time as the GPR data. A layer with a significant temperature gradient was detected, which gives clear reflections on radargrams, its fine structure and changes with time were investigated. The article presents the results of field measurements, as well as the physical and numerical modeling of the propagation of GPR signals in the gradient layer. |
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conference
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19th International Multidisciplinary Scientific GeoConference SGEM 2019
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19th International Multidisciplinary Scientific GeoConference SGEM 2019, 30 June - 6 July, 2019
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Proceedings Paper
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STEF92 Technology
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International Multidisciplinary Scientific GeoConference-SGEM
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Bulgarian Acad Sci; Acad Sci Czech Republ; Latvian Acad Sci; Polish Acad Sci; Russian Acad Sci; Serbian Acad Sci & Arts; Slovak Acad Sci; Natl Acad Sci Ukraine; Natl Acad Sci Armenia; Sci Council Japan; World Acad Sci; European Acad Sci, Arts & Letters; Ac
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829-838
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30 June - 6 July, 2019
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website
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cdrom
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4875
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thermocline; ground penetrating radar; physical modeling; numerical modeling
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