Publication Date:
2017-04-04
Description:
The present work reports on the isotopic characterization
of rainfall and groundwater at Mt. Vesuvius.
Values of d18O, monthly measured on rain samples collected
during the period 2002–2004 in a rain-gauge network
composed of 10 stations, were compared with
meteorological and DEM data. Air temperature, controlled
by the local orographic structure, was identified as the main
factor influencing rain isotopic composition. Another
important role is played by orographic clouds, whose
condensation over the top of Mt. Vesuvius is responsible
for anomalously high d18O values recorded in rain samples
from the summit area of the volcanic edifice. A spatial
model of rain isotopic composition, based on a 3D distribution
of temperature derived by a 1 9 1 km DEM, was
implemented and used for calculating the theoretical isotopic
signature of seepage, further compared with data
measured in the groundwater monitoring network. The
analysis evidenced the role of local meteoric recharge as
the main source feeding Mt. Vesuvius aquifers. The unique
exception is the Olivella drainage gallery, located on the
north-eastern flank of the volcanic edifice, whose isotopic
composition is slightly more positive than the one expected
for its altitude, likely caused by both evaporation processes
and mixing with condensed hydrothermal vapor.
Description:
Published
Description:
2009-2018
Description:
4V. Vulcani e ambiente
Description:
JCR Journal
Description:
restricted
Keywords:
Groundwater
;
Orographic cloud
;
Oxygen isotopic composition
;
Rain
;
Vesuvius
;
03. Hydrosphere::03.04. Chemical and biological::03.04.07. Radioactivity and isotopes
Repository Name:
Istituto Nazionale di Geofisica e Vulcanologia (INGV)
Type:
article
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