Long-term thermal evolution and effect of low power heating in an underground quarry

Crouzeix, Catherine; Mouël, Jean‐Louis Le; Perrier, Frédéric; Richon, Patrick; Morat, Pierre

doi:10.1016/s1631-0713(03)00054-3

Cited by 18 publications

(11 citation statements)

References 11 publications

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“…1), as well as three other locations: two points N2 and N3 intermediate between the two rooms, and one point (B20) in the southernmost part. One room, referred to as ''room 15'', was selected to perform heating experiments (CROUZEIX et al, 2003;2006a, b) and, in July 2003, was equipped with a thermally insulating wall (styrofoam TM ) to restrict air currents and ventilation with the rest of the quarry. The partition defines a volume of 216 m 3 (mean width 9 m, height 2 m and length 12 m), with a total wall surface area of 282 m 2 .…”

Section: Experimental Set-ups In the Vincennes Quarry And The Paris Omentioning

confidence: 99%

Spatial and Temporal Dependence of Temperature Variations Induced by Atmospheric Pressure Variations in Shallow Underground Cavities

Perrier

Mouël

Richon

2010

Pure Appl. Geophys.

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Pressure-induced temperature (PIT) variations are systematically observed in the atmosphere of underground cavities. Such PIT variations are due to the compressibility of the air, damped by heat exchange with the rock surface. It is important to characterize such processes for numerous applications, such as the preservation of painted caves or the assessment of the long-term stability of underground laboratories and underground waste repositories. In this paper we thoroughly study the spatiotemporal dependence of the PIT response versus frequency using vertical and horizontal profiles of temperature installed in an abandoned underground quarry located in Vincennes, near Paris. The PIT response varies from about 20 9 10 -3°C hPa -1 at a frequency of 2 9 10 -4 Hz to 2-3 9 10 -3°C hPa -1 at a frequency of one cycle per day. An analytical expression based on a simple heat exchange model accounts for the observed features of the PIT response and allows for correcting the measured time series, having standard deviations of about 10 -2°C , to residual variations with a standard deviation of about 2 9 10 -3°C . However, a frequency-dependent attenuation of the response, corresponding to a reduction in amplitude with a factor varying from 2 to 3, is observed near the walls. This effect is not included in the simple analytical expression, but it can be accounted for by a one-dimensional differential equation, solved numerically, where temperature variations in the atmosphere are damped by an effective radiative coupling with the rock surface, complemented by a diffusive coupling near the walls. The TIP response is observed to remain stable over several years, but a large transient enhancement of about a factor of two is observed near the roof at one location from July to October 2005. In a cavity located below the Paris Observatory, an additional contribution is identified in the PIT response function versus frequency for frequencies smaller than 2 9 10 -5 Hz. This contribution can be described using a modified analytical expression that includes the effect of heat diffusion into the surrounding rock. Using this expression, in this case also, the temperature time series can then be corrected, giving a residual standard deviation smaller than 1.6 9 10 -3°C . Transient temporal variations of the PIT response are observed in all sites, with possible nonlinear components in the PIT. Such effects are not properly understood at this stage, and limit the reduction of time series to standard deviations of the order of 2 9 10 -3°C , and consequently limit the search for new transient or seasonal temperature signals, for example due to the presence of tiny heat sources in the cavity or to geodynamical effects.

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Section: Experimental Set-ups In the Vincennes Quarry And The Paris Omentioning

confidence: 99%

Spatial and Temporal Dependence of Temperature Variations Induced by Atmospheric Pressure Variations in Shallow Underground Cavities

Perrier

Mouël

Richon

2010

Pure Appl. Geophys.

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“…A first set of experiments was performed from February to May 2002 in an open room of the underground quarry of Vincennes, near Paris [18]. Low power heat sources were used (100 W), and temperature was measured in the air and in the rock at different heights.…”

Section: Introductionmentioning

confidence: 99%

Thermal stratification induced by heating in a non-adiabatic context

Crouzeix¹,

Mouël²,

Perrier³

et al. 2006

Building and Environment

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“…In order to introduce minimal perturbations, Cassini entered the room always alone, holding a weak candle and remaining only the short time needed to read both thermometers. Thus, Cassini was aware of the thermal effect associated with a person, which corresponds to a power of the order of 100 W, a value large enough to produce lasting thermal effects in the delicate underground environment (Crouzeix et al, 2003). The temperature at the surface was also measured.…”

Section: Paris Observatory Underground Datamentioning

confidence: 99%

“…In addition, temperature records in the underground galleries of the Paris Observatory were possibly affected by the presence of a heat source (petrol lamp) from 1912 to 1917. Recent experiments (Crouzeix et al, 2003) indeed indicated that a low power heat source can have lasting effects in underground settings, possibly longer than ten times the heating duration.…”

Section: Introductionmentioning

confidence: 99%

Long-term climate change and surface versus underground temperature measurements in Paris

et al. 2005

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Careful temperature measurements performed from 1783 to 1852 in underground galleries, 28 m below the Paris Observatory, are compared with current measurements performed in a limestone quarry, 20 m below ground surface, and with local and European surface temperature records. When averaged using a backward 11-year moving window, the surface temperature time series looks similar and exhibits the already well-known 1°C temperature increase over the last century. In addition, since about 1987, a steeper increase of about 0.07°C per year is noticed on all surface records. Underground temperatures, unaffected by surface fluctuations and averaging procedures, show a 0.9°C increase and thus confirm the trend indicated by the surface records. The averaged time series of the temperature in Paris and of the Wolf number, an indicator of sunspot activity, were reasonably well correlated till 1987 but deviated significantly from each other after that date. The long-term connection between surface temperature and solar cycles is further supported by a temporal analysis of the frequency content at 11 years and 5.5 years. Visual correlations between temperature and sunspot numbers, unconvincing when using recent records, appear more striking with underground data from 1783 to 1852. This analysis suggests that solar activity played an important role in temperature changes till the last century, but that different processes, possibly related to human-induced changes in the climate system, have been taking place lately with increasing intensity, especially since 1987.

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Long-term thermal evolution and effect of low power heating in an underground quarry

Cited by 18 publications

References 11 publications

Spatial and Temporal Dependence of Temperature Variations Induced by Atmospheric Pressure Variations in Shallow Underground Cavities

Spatial and Temporal Dependence of Temperature Variations Induced by Atmospheric Pressure Variations in Shallow Underground Cavities

Thermal stratification induced by heating in a non-adiabatic context

Long-term climate change and surface versus underground temperature measurements in Paris

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