Record details

Title
    Recurrence quantification analysis of borehole temperatures: evidence of fluid convection
Author
    Čermák, Vladimír
Language
    anglicky
Publication type
    článek v odborném periodiku
Source title - serial
    International Journal of Bifurcation and Chaos
Vol./nr.
    Roč. 19, č. 3
Pages
    s. 889-902
Year
    2009
Notes
    Rozsah: 14 s.
    Výzkumný záměr: CEZ:AV0Z30120515
Subject category
    borehole temperatures
    fluid intermittency
    periodic-chaotic transition
    recurrence quantification analysis
Keyword
    Analysis
    Borehole
    Convection
    Evidence
    Fluid
    Quantification
    Recurrence
    Temperatures
Abstract (in english)
   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.
Contributor
    AV ČR Brno, Geofyzikální ústav
Contributor code
    AV ČR, GFÚ
Source format
    U
Import date
    9. 12. 2013