One of the primary research goals at Sistema
Zacatón is to
create an extremely detailed, three-dimensional representation of the karst
aquifer system using multi-sourced digital datasets. This 3-D
imagery will be used for identifying spatial distribution of geologic,
biologic, and hydrologic properties, and will also produce an exceptional
devise for educational outreach. The three data sources are:
LADAR (LAser
Distance And Ranging) for the surface features,
SONAR
for sub-aquatic imaging, and Earth Resistivity geophysical imaging for
sub-surface interpretations. By integrating all three of these
independent data sources into a common geographic Cartesian coordinate
system, the physical extent and development of the Sistema Zacatón karst
can be quantified quite accurately.
A three-dimensional model is
planned for the complex of water-filled sinkholes in the south section of
the study area (see
study area aerial photo and
cross-section) that incorporates multi-sourced datasets of the
land surface, phreatic voids (flooded cave passages), and the Earth
subsurface. To date, the land surface model data has been acquired
using a laser radar instrument, or LADAR
(similar LIDAR). In
January
2002, a expedition including Marcus Gary,
Dr. Jack Sharp,
Dr. Mark Helper (The University of Texas), and
Dr. Bill Stone-(email) (STONE
Aerospace and developer of the underwater
Digital Wall Mapper) surveyed and scanned the land and water surface of
Zacatón,
Caracol,
La
Pilita, and Azufrosa using a LADAR instrument supplied from the NIST
lab. Two to five scans from each of the sinkholes were made,
collecting point data in sub-centimeter resolution. Over 5 million
data points were recorded.
Future field work is planned using SONAR technology to image underwater
regions, and geophysical Earth Resistivity techniques to image
the subsurface structures. Ultimately, all three of these spatial
datasets are to be meshed together to create an unprecedented,
high-resolution model of a karst aquifer.
Back to previous page |