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Transient temperature field of the shallow subsurface and its sources
Dědeček, Petr ; Šafanda, Jan (advisor) ; Hokr, Milan (referee) ; Majorowicz, Jacek (referee)
Long-term air and ground temperature series and repeated temperature logs from several boreholes in Czech Republic, Slovenia and Portugal were processed to distinguish and describe possible sources of transient signals in subsurface temperature field. Two methods for estimation of the soil and bedrock thermal diffusivity from long-term temperature records are presented and compared. Results proved that on the annual time scale the convective heat transfer did not contribute significantly to the temperature-time variations monitored in the uppermost 10-m depth zone and that the influence of moisture changes on subsurface temperature field noticeably appears only in upper 5 cm of soil. Using 3D numerical modelling a direct human impact on the subsurface temperature warming was proved and contributions of individual anthropogenic structures to this change were evaluated. It made it possible to split the transient component of the present-day temperature depth profiles into the climatic and anthropogenic signals.
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Transient temperature field of the shallow subsurface and its sources
Dědeček, Petr ; Šafanda, Jan (advisor) ; Hokr, Milan (referee) ; Majorowicz, Jacek (referee)
Long-term air and ground temperature series and repeated temperature logs from several boreholes in Czech Republic, Slovenia and Portugal were processed to distinguish and describe possible sources of transient signals in subsurface temperature field. Two methods for estimation of the soil and bedrock thermal diffusivity from long-term temperature records are presented and compared. Results proved that on the annual time scale the convective heat transfer did not contribute significantly to the temperature-time variations monitored in the uppermost 10-m depth zone and that the influence of moisture changes on subsurface temperature field noticeably appears only in upper 5 cm of soil. Using 3D numerical modelling a direct human impact on the subsurface temperature warming was proved and contributions of individual anthropogenic structures to this change were evaluated. It made it possible to split the transient component of the present-day temperature depth profiles into the climatic and anthropogenic signals.
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Final report on the results of a project of the programme "Trvalá prosperita" funded by the Ministry of Industry and Trade of the Czech Republic in the period 2006-2007
Myslil, V. ; Stibitz, M. ; Jiráková, H. ; Fritschová, L. ; Šafanda, Jan ; Burda, J. ; Brož, K. ; Karous, M. ; Landa, I. ; Procházka, M. ; Gregor, P. ; Wolfbauer, J. ; Kalaš, P. ; Motlík, J. ; Alinče, Z. ; Spudil, J. ; Pechar, T. ; Mužák, J. ; Sciranková, L.
The project has explored a potential of the Litoměřice geothermal structure. The structure had been forecasted as a suitable one for the geothermal energy exploitation by the previous geothermal research of the Bohemian Massif.
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Report on the geothermal research in borehole GTPVLT-1 (Litoměřice) - appendix
Šafanda, Jan ; Dědeček, Petr ; Krešl, Milan ; Čermák, Vladimír
The report provides detailed information about geothermal research in borehole GTPVLT-1 in the Czech Republic together with all graphic outputs. It includes (i) repeated temperature logs during and after the borehole drilling, (ii) measurements of thermal conductivity and diffusivity of the encountered rock samples, (iii) measurements of radioactive isotopes content of uranium, thorium and potassium in the encountered rock samples and calculation of their radiogenic heat production, (iv) determination of the terrestrial heat flow in the borehole and (v) prognosis of temperature expected down to the depth of 5 km.
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Report on the geothermal research in borehole GTPVLT-1 (Litoměřice)
Šafanda, Jan ; Dědeček, Petr ; Krešl, Milan ; Čermák, Vladimír
The report provides information about geothermal research in borehole GTPVLT-1 in the Czech Republic, which included (i) repeated temperature logs during and after the borehole drilling, (ii) measurements of thermal conductivity and diffusivity of the encountered rock samples, (iii) measurements of radioactive isotopes content of uranium, thorium and potassium in the encountered rock samples and calculation of their radiogenic heat production, (iv) determination of the terrestrial heat flow in the borehole and (v) prognosis of temperature expected down to the depth of 5 km.
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