Pressure induced temperature variations in an underground quarry

Perrier, Frédéric; Morat, Pierre; Mouël, Jean‐Louis Le

doi:10.1016/s0012-821x(01)00411-3

Cited by 30 publications

(39 citation statements)

References 11 publications

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“…Such broad-band coherent temperature fluctuations are intriguing. Pressure variations can induce temperature fluctuations that are coherent over large distances but amplitudes are smaller than 0:05 C [7]. The temperature fluctuations must be associated with a random vigorous stirring associated with the falling cold plumes.…”

Section: Volume 89 Number 13 P H Y S I C a L R E V I E W L E T T E Rmentioning

confidence: 99%

“…1) near the metallic staircase. These thermistors have a diameter of 5 mm, a length of 30 mm, and a sensitivity of about 135 = C at 12 C [7]. They were not calibrated individually but were sorted to have similar characteristics in the laboratory so that differences in their relative calibration can be neglected in the present experiment.…”

mentioning

confidence: 99%

“…where 0 is a thermal relaxation term [7]. The last term corresponds to the latent heat associated with the water exchange and L= d a c a w , where c a is the specific heat of dry air (10 3 J kg ÿ1 K ÿ1 ) and L the latent heat of water (2:5 10 6 J=kg ÿ1 ).…”

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confidence: 99%

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Dynamics of Air Avalanches in the Access Pit of an Underground Quarry

2002

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International audienceTemperature measurements have been performed in the vertical access pit of an underground quarry. During autumn, air avalanches induce an initial thermal feedback and a stationary mixing state characterized by spatially coherent broad-band fluctuations with a standard deviation of about 0:2 C, linearly increasing with the inside-minus-outside temperature difference. Phase changes of water are shown to contribute to the onset condition, the feedback, and the stationary mixing state. This experiment may give insight on turbulent thermal and compositional convection with nonadiabatic boundaries

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Section: Volume 89 Number 13 P H Y S I C a L R E V I E W L E T T E Rmentioning

confidence: 99%

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confidence: 99%

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Dynamics of Air Avalanches in the Access Pit of an Underground Quarry

2002

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“…The wide variety of natural conditions depicted in the abundant speleologic literature (Trombe, 1952;Saar, 1954;Geiger, 1959;Renault, 1961;Conn, 1966;Ciry, 1967;Cigna, 1967, Schoeller, 1967Eraso, 1971) suggests that several physical mechanisms may be involved in the regulation of cave atmospheres. Recently, Perrier et al (2001Perrier et al ( , 2004 have proposed and quantified a series of physical mechanisms from thermal and compositional data gathered in an abandoned underground limestone quarry.…”

Section: Introductionmentioning

confidence: 99%

Microclimates of l'Aven d'Orgnac and other French limestone caves (Chauvet, Esparros, Marsoulas)

Bourges¹,

Genthon²,

Mangin³

et al. 2006

Intl Journal of Climatology

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We assess the aerodynamics of the atmosphere in some limestone caves using a 5-year monitoring of the Aven d'Orgnac system, shorter thermal vertical profiling experiments, and comparison with the time series from other French caves. In the first rooms, located under the Aven opening, our records indicate, for each year, a succession of a summer regime characterized by stable parameters (except for the perturbations introduced by tourist visits) and a winter regime, in which the inner air temperature drops and is highly correlated with that outside. Atmospheric composition suggests that during the winter regime the cave is ventilated by the outside air. We show that the onset of the winter regime is governed by a thermo-convective instability involving the inflow of the outside cold and dense air. Atmospheric temperature and composition allow us to follow the stepwise progression of the winter regime toward the adjacent rooms.In the Salle Plane (SP), a far room of the Orgnac-Issirac karstic system, in which the winter regime has never been observed, the air temperature is extremely homogeneous and steady, and is characterized by a half-daily signal of amplitude less than 0.03°C, which is correlated with the derivative of pressure versus time. This correlation, which is also observed in various other confined caves, may be explained by pressure-induced temperature changes relaxed in less than 1 h by thermal exchanges with a large volume of rock whose temperature is assumed to be constant.The various microclimates of karstic cave systems should be taken into account for the conservation of the caves open to tourists and for the interpretation of growth laminae of speleothems.

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“…At times smaller than a day, temperature variations are mostly due to variations of atmospheric pressure (Perrier et al, 2001), and do not exceed 0.03 • C peak to peak in the absence of perturbations (visits, heating experiments). As in most underground systems, relative humidity in the atmosphere of the quarry is high (99.2-99.8 %).…”

Section: The Vincennes Quarrymentioning

confidence: 99%

Intermittent heat instabilities in an air plume

Mouël

Perrier

Morat

2016

Nonlin. Processes Geophys.

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Abstract. We report the results of heating experiments carried out in an abandoned limestone quarry close to Paris, in an isolated room of a volume of about 400 m 3 . A heat source made of a metallic resistor of power 100 W was installed on the floor of the room, at distance from the walls. High-quality temperature sensors, with a response time of 20 s, were fixed on a 2 m long bar. In a series of 24 h heating experiments the bar had been set up horizontally at different heights or vertically along the axis of the plume to record changes in temperature distribution with a sampling time varying from 20 to 120 s. When taken in averages over 24 h, the temperatures present the classical shape of steady-state plumes, as described by classical models. On the contrary, the temperature time series show a rich dynamic plume flow with intermittent trains of oscillations, spatially coherent, of large amplitude and a period around 400 s, separated by intervals of relative quiescence whose duration can reach several hours. To our knowledge, no specific theory is available to explain this behavior, which appears to be a chaotic interaction between a turbulent plume and a stratified environment. The observed behavior, with first-order factorization of a smooth spatial function with a global temporal intermittent function, could be a universal feature of some turbulent plumes in geophysical environments.

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Pressure induced temperature variations in an underground quarry

Cited by 30 publications

References 11 publications

Dynamics of Air Avalanches in the Access Pit of an Underground Quarry

Dynamics of Air Avalanches in the Access Pit of an Underground Quarry

Microclimates of l'Aven d'Orgnac and other French limestone caves (Chauvet, Esparros, Marsoulas)

Intermittent heat instabilities in an air plume

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