Three-dimensional inverse modeling of EM-LIN data for the exploration of coastal sinkholes in Quintana Roo, Mexico
2019
Abstract. In the Yucatan Peninsula (YP), southern Mexico, cities and towns
are settled on a platform of calcareous sedimentary sequence, where karst
processes have formed numerous sinkholes, underground water conduits, and
caverns. Anthropogenic activities there threaten the only source of
freshwater supply, which is in a regional unconfined aquifer; there are no
lakes or rivers on the surface. For the sustainable management of this
resource in the YP, mathematical tools are needed in order to model
groundwater. To determine the geometry of the aquifer, for example the
positions of caves, sinkholes, and underground principal conduits, we
modified a software to invert three-dimensional electromagnetic
low-induction number (3-D EM-LIN) data for a set of profiles at arbitrary
angles. In this study we used the EM-LIN geophysical method to explore the
Chac-Mool sinkhole system in the state of Quintana Roo, Mexico. We performed
inverse modeling in 3-D using the EM-34 instrument for vertical and
horizontal magnetic dipoles. The 3-D inversion process yields models that
enable us to correlate the path of the underground principal conduits with
the subsurface electrical resistivity. In this work we show that inverse
modeling of EM-LIN data can give us information about how close to surface the underground water conduits and the location of the boundary between
fresh and salty water are.
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