Record details

    Thermal instability of the fluid column in a borehole: application to the Yaxcopoil hole (Mexico)
    Bodri, L.
    Čermák, Vladimír
    Šafanda, Jan
Publication type
    článek v odborném periodiku
Source title - serial
    International Journal of Earth Sciences
    Roč. 99, č. 6
    s. 1437-1451
    Projekt: GA205/06/1181, GA ČR, CZ3cav_un_auth*0216770
    Rozsah: 15 s.
    Výzkumný záměr: CEZ:AV0Z30120515
Subject category
    borehole convection
    recurrence and recurrence interval analyses
    spectral analysis
    temperature monitoring
Abstract (in english)
   Observational evidence proved that even when a borehole is in "fully" stabilized conditions, temperature data may exhibit certain unrest resembling irregular oscillations in the order of hundredths or (in the extreme case) even tenths of degree. Temperature was monitored in complicated hydrogeological conditions in the Yaxcopoil-1 hole (Chicxulub impact structure, Mexico). Two experiments are reported: (a) 20-day monitoring when a logger was located in the center of the high temperature gradient anomaly produced by the cold wave slowly propagating downwards and (b) simultaneous three-loggers 18-day monitoring with loggers located above, in and below the anomaly. All observed temperature-time series displayed intermittent oscillations of temperature with sharp gradients and large fluctuations over all observed time scales.
    AV ČR Brno, Geofyzikální ústav
Contributor code
    AV ČR, GFÚ
Source format
Import date
    9. 12. 2013