Désagrégation des parois rocheuses et climat : approche thermique et thermodynamique

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Abstract
The result of daily range of temperature, and frost more than anything else, is weathering of walls, which culminate in fragmentai deposition. The screes set like that originated the slope-deposits which are climatically interprétable therefore. Microchmatic conditions near the wall determine the temperatures within the rock. So, exact solutions for relations between temperature and fragmentation are first of all a thermal problem For resolving Fourier's equations, thermophysical parameters of the studied rock can be measured varying as temperature and moistness with the help of Signal Theory methods. In a wall, most of part of potential energy gives off cryaergical pressures is dissipated, by feedback Joule's effect, for heat flows. These flux, gradual loss of energy, can only produce an internal increment of entropy By physical nature of entropy, its internal increment describes quantitatively the irreversible evolution of molecular decoherences at every depth (fatigue) which culminate in fissuration. The brutal increment of entropy during congelation is verified by experiment and corresponds to a perfect thermal shock. This decisive phase occurs, for the studied rock waterlogged, at — 3 °C, what quations cryosclastic screes layers attribution to climatic periods much like penglacial.

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