The Portuguese Speleological Society used waterproof Aquatic 2 data loggers to monitor water temperature in cave systems.
In 2015, as part of research for the Alviela 2015 Cave Project,
three Tinytag Aquatic 2 data loggers were deployed in submerged
cave passages in a unique karst massif just north of Lisbon,
Portugal. Ricardo Constantino is the Diving Team coordinator for
the Portuguese Speleological Society and also Project Manager for a
citizen science initiative, Project Baseline. As part of the
research, Ricardo's Team undertook temperature profiling and the
resulting profiles have provided valuable data in terms of water
source and depth/range of the passages.
Dives were programmed to deploy the loggers at different depths
in different passages, from 10m to 90m depths, and retrieved for
data download three years later. The data has proved very useful
for geologists in providing information about underground water
flows. After analysis, the geologists are able to identify further
investigation points that typically require additional dives for
more data collection.
Ricardo chose Tinytags for their robustness and wide depth range
(up to 500m). He found them easy to use with fixed time stamping of
data, and with flexible logging parameters. He comments, "It was a
thrill to find the bright yellow loggers lying where we had left
them almost three years before! Two winter seasons with the typical
high water flow did not damage the units."
The photograph shows one of the data loggers after