Quasi-3-D resistivity imaging - mapping of heterogeneous frozen ground conditions using electrical resistivity tomography (2009)

Please fill the following information to request the publication in hardcopy. We will get in touch with you shortly.

All form fields are required.

Up to now an efficient 3-D geophysical mapping of the subsurface in mountainous environments with rough terrain has not been possible. A merging approach of several closely spaced 2-D electrical resistivity tomography (ERT) surveys to build up a quasi-3-D model of the electrical resistivity is presented herein as a practical compromise for inferring subsurface characteristics and lithology. The ERT measurements were realised in a small glacier forefield in the Swiss Alps with complex terrain exhibiting a small scale spatial variability of surface substrate. To build up the grid for the quasi-3-D measurements the ERT surveys were arranged as parallel profiles and perpendicular tie lines. The measured 2-D datasets were collated into one quasi-3-D file. A forward modelling approach - based on studies at a permafrost site below timberline - was used to optimize the geophysical survey design for the mapping of the mountain permafrost distribution in the investigated glacier forefield. Quasi-3-D geoelectrical imaging is a useful method for mapping of heterogeneous frozen ground conditions and can be considered as a further milestone in the application of near surface geophysics in mountain permafrost environments.
Language: English
Imprint: The Cryosphere Discuss., Issue 3, 895-918: http://www.the-cryosphere-discuss.net/3/895/2009/ 2009
Series: Discussion paper,