Thermal instability of the fluid column in a borehole: application to the Yaxcopoil hole (Mexico)

0330217 - GFÚ 2011 RIV DE eng J - Journal Article
Čermák, Vladimír - Šafanda, Jan - Bodri, L.
Thermal instability of the fluid column in a borehole: application to the Yaxcopoil hole (Mexico).
International Journal of Earth Sciences. Roč. 99, č. 6 (2010), s. 1437-1451. ISSN 1437-3254. E-ISSN 1437-3262
R&D Projects: GA ČR(CZ) GA205/06/1181
Institutional research plan: CEZ:AV0Z30120515
Keywords : temperature monitoring * borehole convection * recurrence and recurrence interval analyses * spectral analysis
Subject RIV: DC - Siesmology, Volcanology, Earth Structure
Impact factor: 1.980, year: 2010

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.
Permanent Link: http://hdl.handle.net/11104/0176059