<div class="csl-bib-body">
<div class="csl-entry">Hoppenbrock, J., Bücker, M. B., Gallistl, J., Flores-Orozco, A., de la Paz, C. P., García García, C. E., Razo Pérez, J. A., Buckel, J., & Pérez, L. (2021). Evaluation of Lake Sediment Thickness from Water-Borne Electrical Resistivity Tomogragraphy Data. <i>Sensors</i>, <i>21</i>(23), Article 8053. https://doi.org/10.3390/s21238053</div>
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dc.identifier.issn
1424-8220
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dc.identifier.uri
http://hdl.handle.net/20.500.12708/138626
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dc.description.abstract
Lakes are integrators of past climate and ecological change. This information is stored in
the sediment record at the lake bottom, and to make it available for paleoclimate research, potential
target sites with undisturbed and continuous sediment sequences need to be identified. Different
geophysical methods are suitable to identify, explore, and characterize sediment layers prior to
sediment core recovery. Due to the high resolution, reflection seismic methods have become standard
for this purpose. However, seismic measurements cannot always provide a comprehensive image
of lake-bottom sediments, e.g., due to lacking seismic contrasts between geological units or high
attenuation of seismic waves. Here, we developed and tested a complementary method based on
water-borne electrical-resistivity tomography (ERT) measurements. Our setup consisted of 13 floating
electrodes (at 5 m spacing) used to collect ERT data with a dipole–dipole configuration. We used
a 1D inversion to adjust a layered-earth model, which facilitates the implementation of constraints
on water depth, water resistivity, and sediment resistivity as a priori information. The first two
parameters were readily obtained from the echo-sounder and conductivity-probe measurements. The
resistivity of sediment samples can also be determined in the laboratory. We applied this approach to
process ERT data collected on a lake in southern Mexico. The direct comparison of ERT data with
reflection seismic data collected with a sub-bottom profiler (SBP) showed that we can significantly
improve the sediment-thickness estimates compared to unconstrained 2D inversions. Down to water
depths of 20 m, our sediment thickness estimates were close to the sediment thickness derived from
collocated SBP seismograms. Our approach represents an implementation of ERT measurements on
lakes and complements the standard lake-bottom exploration by reflection seismic methods.
en
dc.language.iso
en
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dc.publisher
MDPI
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dc.relation.ispartof
Sensors
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dc.subject
Electrical and Electronic Engineering
en
dc.subject
Atomic and Molecular Physics, and Optics
en
dc.subject
Instrumentation
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dc.subject
Biochemistry
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dc.subject
Analytical Chemistry
en
dc.title
Evaluation of Lake Sediment Thickness from Water-Borne Electrical Resistivity Tomogragraphy Data