http://www.cnr.it/ontology/cnr/individuo/prodotto/ID183861
MONITORING THE SALTWATER INTRUSION BY TIME LAPSE ELECTRICAL RESISTIVITY TOMOGRAPHY: THE CHIOGGIA TEST SITE (VENICE LAGOON, ITALY) (Abstract/Comunicazione in atti di convegno)
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- MONITORING THE SALTWATER INTRUSION BY TIME LAPSE ELECTRICAL RESISTIVITY TOMOGRAPHY: THE CHIOGGIA TEST SITE (VENICE LAGOON, ITALY) (Abstract/Comunicazione in atti di convegno) (literal)
- Anno
- 2007-01-01T00:00:00+01:00 (literal)
- Alternative label
DE FRANCO R; BIELLA G; TEATINI P; TOSI L; CHIOZZOTTO B; CLAUDE C; MAYER A; BASSAN V; GASPARETTO-STORI G (2007)
MONITORING THE SALTWATER INTRUSION BY TIME LAPSE ELECTRICAL RESISTIVITY TOMOGRAPHY: THE CHIOGGIA TEST SITE (VENICE LAGOON, ITALY)
in SESTO Forum Italiano di Scienze della Terra, RIMINI, 12-14 settembre 2007
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- DE FRANCO R; BIELLA G; TEATINI P; TOSI L; CHIOZZOTTO B; CLAUDE C; MAYER A; BASSAN V; GASPARETTO-STORI G (literal)
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- 1 - IDPA-CNR
2 - DMMSA-Università di padova
3 - ISMAR-CNR
4 - Morgan Rilievi Srl
5 - CEREGE-Aix en Provence
6 - Provincia di Venezia-Servizio Geologico
7 - Consorzio di Bonifica Adige-Bacchiglione- Conselve (PD) (literal)
- Titolo
- MONITORING THE SALTWATER INTRUSION BY TIME LAPSE ELECTRICAL RESISTIVITY TOMOGRAPHY: THE CHIOGGIA TEST SITE (VENICE LAGOON, ITALY) (literal)
- Abstract
- An electrical resistivity tomography (ERT) time lapse experiment aimed at
monitoring the dynamics of the saltwater intrusion in the coastland bounding
the southern Venice Lagoon, near the city of Chioggia (Italy), is presented. The
experiment, operated for about one year from November 2005 to September
2006, was carried out by means of an apparatus developed ad hoc. Some
preliminary test and calibration acquisitions allowed the final setup of the
experimental parameters. The system acquired 10 apparent resistivity
tomograms per day, five of which with high resolution by a 97.5 m long ERT
line with a 2.5 m electrode spacing and five by a 300 m long and 5 m electrode
spacing ERT line, suitable to monitor the intrusion process down to 50-60 m
depth. A 50 m deep exploratory borehole drilled near the test site identified a
shallow phreatic aquifer and two confined aquifers within the depth of interest
and allow to constrain the electro-stratigraphy obtained by the resistivity
tomography. The collected data point out a different time behavior of the
salinization process in the upper aquifer with respect to the deeper ones. The
shallow aquifer, located between 3 and 15 m depth below mean sea level, is
the most contaminated by the salt intrusion with a minimum resistivity
formation value of 0.8 ohm*m. For the upper 2-3 m depth the experimental
data reveal a seasonal resistivity fluctuation with a minimum salt intrusion in
March-April and a maximum in the dry summer season. An opposite behavior
was experimented by the lower part. The deeper aquifers are characterized by
a resistivity ranging from 3.0 ohm*m to 10 ohm*m and show a resistivity rise
at the beginning of the summer time probably due to an increasing contribution
of fresh water from sub-regional aquifers. The data collected by the
experiment have been correlated with a number of environmental variables,
i.e. tidal regime, rainfall, groundwater table, and water levels in the
watercourses close the monitoring site. In particular, a correlation is found
between the resistivity in the upper 5 m of the phreatic aquifer and the
rainfalls, and between the water level in the adjacent main channel and the
resistivity down to about 10 m depth. This relation is indicative of the
draining/feeding influence exerted by the channel probably only to the first
aquifer. Moreover a quite clear negative correlation with the tidal regime is
observed at seasonal time scale, while at daily time scale the tidal oscillation
doesn't affect the resistivity behaviour in the phreatic aquifer. (literal)
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