DETERMINATIONS OF HEAT FLOW DENSITY IN THE NORTHERN PART OF THE UPPER RHINE RIFT VALLEY (2 VOLUMES)
In order to determine the terrestrial heat flow density in the northern Upper Rhinegraben, 159 shallow and 9 deep boreholes were logged for temperature profiles. 18 % of the shallow hole profiles show little or no distortions, while another 76 % exhibit distortions typical for predominantly vertical water flows. These flows are evaluated and in a few cases (2 %) the temperature disturbance could be corrected for. The influence of the climatic variations and of the topography was carefully investigated and corrected for. The deep temperature profiles show a systematic gradient decrease with depth which can be interpreted as due to both a systematic increase of thermal conductivity and vertically ascending waters. For the determination of the in situ thermal conductivity in cased boreholes a new method has been developed using the temperature rise of a heated section of the water filled borehole. Since most of these measurements are more or less disturbed due to induced convection within the annular space, only a regional mean value can be given. Since the results cannot be interpreted in terms of the heat flow density, they are interpreted in a hydrological context, using the lateral variation of the temperature gradients. Probable lateral variations of heat flow density are masked by local and regional flow fields. A separation of the two heat transport mechanisms (conduction and convection) is not possible for such a complicated system like the investigated area using existing methods.
Bibliographic Reference: EUR 9752 DE (1985) MF, 967 P., BFR 1500, EUROFFICE, LUXEMBOURG, POB 1003 - NO BLOW-UP AVAILABLE!
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Record Number: 1989123039300 / Last updated on: 1987-01-01
Available languages: de