Subsurface architecture of the Boulder Creek Critical Zone Observatory from electrical resistivity tomography

Leopold, Matthias; Völkel, Jörg; Huber, Juliane; Dethier, David

doi:10.1002/esp.3420

Fachgebiet Geomorphologie und Bodenkunde (Prof. Völkel)

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Title:: Subsurface architecture of the Boulder Creek Critical Zone Observatory from electrical resistivity tomography
Document type:: Zeitschriftenaufsatz
Author(s):: Leopold, Matthias; Völkel, Jörg; Huber, Juliane; Dethier, David
Abstract:: The architecture of the critical zone includes the distribution, thickness, and contacts of various types of slope deposits and weathering products such as saprolite and weathered bedrock resting on solid bedrock. A quantitative analysis of architecture is necessary for many model-driven approaches used by pedologic, geomorphic, hydrologic or biologic studies. We have used electrical resistivity tomography, a well-established geophysical technique causing minimum surficial disturbance, to portray the subsurface electrical resistivity differences at three study sites (Green Lakes Valley; Gordon Gulch; Betasso) at the Boulder Creek Critical Zone Observatory (BcCZO). Possible limitations of the technique are discussed. Interpretation of the specific resistivity values using natural outcrops, pits, roadcuts and drilling data as ground truth information allows us to image the critical zone architecture of each site. Green Lakes Valley (3700 MASL), a glacially eroded alpine basin, shows a rather simple, split configuration with coarse blockfields and sediments, partly containing permafrost above bedrock. The critical zone in Gordon Gulch (2650 MASL), a montane basin with rolling hills, and Betasso (1925 MASL), a lower montane basin with v-shaped valleys, is more variable due to a complex Quaternary geomorphic history. Boundaries between overlying stratified slope deposits and saprolite were identified at mean depths of 3.0 ± 2.2 m and 4.1 ± 3.6 m in the respective sites. The boundary between saprolite and weathered bedrock is deeper in Betasso at 5.8 ± 3.7 m, compared with 4.3 ± 3.0 m in Gordon Gulch. In general, the data are consistent with results from seismic studies, but electrical resistivity tomography documents a 0.5–1.5 m shallower critical zone above the weathered bedrock on average. Additionally, we document high lateral variability, which results from the weathering and sedimentation history and seems to be a consistent aspect of critical zone architecture within the BcCZO. Copyright © 2013 John Wiley & Sons, Ltd.
Journal title:: Earth Surface Processes and Landforms
Year:: 2013
Pages contribution:: n/a-n/a
Fulltext / DOI:: doi:10.1002/esp.3420
Publisher:: Wiley-Blackwell
E-ISSN:: 0197-9337
Date of publication:: 01.05.2013
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mediaTUM Gesamtbestand Einrichtungen Schools TUM School of Life Sciences Departments Life Science Systems Professur für Geomorphologie und Bodenkunde (Prof. Völkel)Publikationen am Extraordinariat für Geomorphologie und Bodenkunde 2013

mediaTUM Gesamtbestand Hochschulbibliographie 2013 Fakultäten Wissenschaftszentrum Weihenstephan Fachgebiet Geomorphologie und Bodenkunde (Prof. Völkel)