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Recurrence quantification analysis of borehole temperatures: evidence of fluid convection

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    0330791 - GFÚ 2010 RIV SG eng J - Journal Article
    Čermák, Vladimír
    Recurrence quantification analysis of borehole temperatures: evidence of fluid convection.
    International Journal of Bifurcation and Chaos. Roč. 19, č. 3 (2009), s. 889-902. ISSN 0218-1274. E-ISSN 1793-6551
    Institutional research plan: CEZ:AV0Z30120515
    Keywords : borehole temperatures * recurrence quantification analysis * fluid intermittency * periodic-chaotic transition
    Subject RIV: DC - Siesmology, Volcanology, Earth Structure
    Impact factor: 0.918, year: 2009

    To describe intra-hole fluid convection, fine-scale temperature-time variations were monitored at 25 depth levels within a 50 m long interval (80–130 m depth) in a slim experimental borehole in Sporilov (the Czech Republic). High-resolution temperature data were sampled with a 15 sec time interval for 1.6 up to 2.7 days. The time series obtained were from 10 000 to 16 000 data points. In the upper part of the investigated depth interval, the temperature time series showed a complex oscillation pattern with amplitudes of up to 45 mK (milliKelvin). This variation pattern is alternated with a "quiet" regime below 110 m depth, where temperature oscillations fall within 4–10 mK range.
    Permanent Link: http://hdl.handle.net/11104/0176494

     
     
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