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Es erkennt hier eine sprudelnde Quelle. Wir auch. - ULV Leoben ...
Es erkennt hier eine sprudelnde Quelle. Wir auch. - ULV Leoben ...
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92<br />
Zur Person:<br />
Studium der Technischen Physik (TU Graz)<br />
Dissertation und Habilitation (MUL)<br />
derzeit: ao.Prof. Lehrstuhl für Geophysik (MUL)<br />
Landslide forecasting<br />
The possibilities of landslide forecasting by geophysical measurements, especially<br />
by the geoelectric method have been investigated.<br />
actual approach is focused on the detection of the<br />
first mentioned longer term steady changes in the<br />
subsurface properties. Geophysical techniques are<br />
very good suited to fulfil this task.<br />
Repeated geoelectric measurements had been<br />
applied to detect changes in the subsurface,<br />
prior to the landslide. These data (figure above)<br />
showed, verified by the later on landslide event,<br />
already changes in the subsurface long before the<br />
actual movement on the surface could be detected.<br />
The resistivity decrease is mainly due to the<br />
increase in the water-saturation of the subsurface.<br />
Higher water-saturation decreases in most cases<br />
the stability.<br />
Erich Niesner<br />
Lehrstuhl für Geophysik<br />
an der MUL seit: 1982<br />
Email: erich.niesner@unileoben.ac.at<br />
www.unileoben.ac.at/~geophwww/niesner.htm<br />
Landslides start suddenly, but quite a time<br />
before there is a slow steady change in<br />
the subsurface properties till the instability<br />
condition, triggering the landslide event, is<br />
reached. Sometimes there are small movements<br />
short before the major event starts<br />
and most of the forecasting systems are<br />
based on the detection of these movements.<br />
These measurements could be difficult since<br />
the areas are often impassable and possible<br />
fixpoints are in most cases far away. Also<br />
landslides often start without prior detectable<br />
movements. Therefore the aim of the<br />
Forschungspartner:<br />
ERKUDOK-Institut Gmunden – J.Weidinger<br />
Projekt gefördert von der Österreichischen Akademie der<br />
Wissenschaften<br />
Forschungsschwerpunkte:<br />
Geoelektrische und elektromagnetische Messverfahren<br />
Spektrale Induzierte Polarisation<br />
Geophysikalische Bohrlochmessungen<br />
Entwicklung von Spezialsonden und Software