Forschungs- & Entwicklungsinformationsdienst der Gemeinschaft - CORDIS

Kurzbeschreibung

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.

Zusätzliche Angaben

Autoren: CLAUSER C, TU BERLIN (GERMANY);UNIVERSITAET KARLSRUHE (GERMANY);VILLINGER H, TU BERLIN (GERMANY);UNIVERSITAET KARLSRUHE (GERMANY);OTT W, TU BERLIN (GERMANY);UNIVERSITAET KARLSRUHE (GERMANY);SATTEL G TU BERLIN (GERMANY), TU BERLIN (GERMANY);UNIVERSITAET KARLSRUHE (GERMANY);UNIVERSITAET KARLSRUHE (GERMANY), TU BERLIN (GERMANY);UNIVERSITAET KARLSRUHE (GERMANY)
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Verfügbarkeit: Can be ordered online
Datensatznummer: 1989123039300 / Zuletzt geändert am: 1987-01-01
Kategorie: publication
Verfügbare Sprachen: de