Subsurface architecture of the Boulder Creek Critical Zone Observatory from electrical resistivity tomography
Subsurface architecture of the Boulder Creek Critical Zone Observatory from electrical resistivity tomography
复制标题
通过电阻率断层扫描观察博尔德溪关键区天文台的地下结构
DOI:
10.1002/esp.3420
复制
发表时间:
2013
影响因子:
3.3
通讯作者:
D. Dethier
中科院分区:
文献类型:
--
作者:
Leopold;Völkel;D. Dethier
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.
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DOI:
--
发表时间:
1996
期刊:
影响因子:
--
作者:
M. Williams;M. Losleben;N. Caine;D. Greenland
通讯作者:
D. Greenland
DOI:
--
发表时间:
1980
期刊:
影响因子:
--
作者:
D. Gable
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D. Gable
DOI:
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发表时间:
1953
期刊:
影响因子:
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作者:
T. S. Lovering;O. Tweto
通讯作者:
O. Tweto
DOI:
--
发表时间:
1995
期刊:
影响因子:
--
作者:
J. Völkel
通讯作者:
J. Völkel
影响因子:
3.9
作者:
S. Riggins;R. Anderson;S. P. Anderson;A. Tye
通讯作者:
S. Riggins;R. Anderson;S. P. Anderson;A. Tye