Two-dimensional anomalies of heat conductivity

Two-dimensional anomalies of heat conductivity and vertical changes of a thermal stream

F.U.Dzhounz and E. R.Oksburg

The Summary. Measurements of a thermal stream are made, as a rule, in vertical chinks; it is thus supposed, that all stream of heat is directed upwards in parallel a chink. In many usual geological situations when breeds with sharply various specific heat conductivity lie down naklonno or do not form near to a chink of continuous layers, this assumption is wrongful. We used numerical methods to study a two-dimensional picture of a thermal field there where it is definitely connected with various often meeting geological structures: with linzovidnym a body, with pair such bodies of a different configuration and with a series of folds. The vertical component of a thermal stream measured on any vertical profile, can vary in the unexpected image owing to the reasons which it is difficult to establish on features of superficial geology or on a chink cut.

The Most usual way of measurement konduktivnogo a terrestrial thermal stream consists in definition of a vertical gradient of temperature in a borehole and in dependence use q =kb, where q - a thermal stream, b - the measured temperature gradient, and k - average factor of heat conductivity for a pack of layers of rocks across which the temperature gradient is measured.

The Specified dependence is applicable only for sufficient depths where blizpoverhnostnye non-stationary influences any more are not felt, and, of course, only for conditions when a stream it is warm it is possible to consider one-dimensional, i.e. When the thermal field is homogeneous also a stream vector is normal to a flat surface of cooling. Well-known, that a relief of a day surface causes deviations from this ideal situation and occurrence lateralnyh streams of heat at a surface: over heights vertical temperature gradients so, and a thermal stream, as a rule, happen lowered, and under valleys raised. The technique of entering into a vertical geothermal gradient of the amendment on deforming influence of a relief is well developed (see, for example,), and application of such amendments to many cases allows to smooth seeming divergences between the values of a thermal stream measured on different depths and between various sites of the same area.

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