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| Titel |
Design of the monitoring system at the Sant'Alessio induced riverbank filtration plant (Lucca, Italy) |
| VerfasserIn |
Rudy Rossetto, Alessio Barbagli, Iacopo Borsi, Giorgio Mazzanti, Daniele Picciaia, Thomas Vienken, Enrico Bonari |
| Konferenz |
EGU General Assembly 2015
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 17 (2015) |
| Datensatznummer |
250107071
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| Publikation (Nr.) |
 EGU/EGU2015-6761.pdf |
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| Zusammenfassung |
| In Managed Aquifer Recharge (MAR) schemes the monitoring system, for both water quality
and quantity issues, plays a key role in assuring that a groundwater recharge plant is really
managed.
Considering induced Riverbank Filtration (RBF) schemes, while the effect of the
augmented filtration consists in an improvement of the quality and quantity of the water
infiltrating the aquifer, there is in turn the risk for groundwater contamination, as surface
water bodies are highly susceptible to contamination.
Within the framework of the MARSOL (2014) EU FPVII-ENV-2013 project, an
experimental monitoring system has been designed and will be set in place at the
Sant’Alessio RBF well field (Lucca, Italy) to demonstrate the sustainability and the benefits
of managing induced RBF versus the unmanaged option.
The RBF scheme in Sant’Alessio (Borsi et al. 2014) allows abstraction of an overall
amount of about 0,5 m3/s groundwater providing drinking water for about 300000 people of
the coastal Tuscany. Water is derived by ten vertical wells set along the Serchio River
embankments inducing river water filtration into a high yield (10-2m2/s transmissivity) sand
and gravel aquifer.
Prior to the monitoring system design, a detailed site characterization has been completed
taking advantage of previous and new investigations, the latter performed by means of
MOSAIC on-site investigation platform (UFZ). A monitoring network has been set in place
in the well field area using existing wells. There groundwater head and the main
physico-chemical parameters (temperature, pH, dissolved oxygen, electrical conductivity and
redox potential) are routinely monitored. Major geochemical compounds along with a large
set of emerging pollutants are analysed (in cooperation with IWW Zentrum Wasser,
Germany) both in surface-water and ground-water.
The experimental monitoring system (including sensors in surface- and ground-water) has
been designed focusing on managing abstraction efficiency and safety at one of the ten
productive wells. The groundwater monitoring system consists of a set of six piezometer
clusters drilled around a reference well along the main groundwater flowpaths. At each
cluster, three piezometers (screened in the penultimate meter) are set at different
depths to allow multilevel monitoring and sampling. At six selected piezometers,
depending on ongoing hydrogeochemical investigations, six sensors for continuous
monitoring of groundwater head, temperature and electrical conductivity will be set in
operation.
Within the Serchio River, two monitoring stations will be set in operation in order to
monitor river head, water temperature and electrical conductivity upstream and downstream
the experimental plot. A multi/parameter probe for the detection of selected analytes such
nitrates, and selected organics to be defined will also be set in the Serchio River
water.
Each sensor will constitute a node of a Wireless Sensor Network (WSN). The WSN is
based on several data loggers «client» connected via radio to one server point (Gateway),
transmitting to a server via GSM-GPRS. This set up, while maintaining the high quality
of data transmission, will allow to reduce installation and operational costs. The
main characteristic of the conceived monitoring system is that sensors have been
selected so to transmit data in an open format. The sensor network prototype will
allow to get a substantial sensor cost reduction compared to available commercial
solutions. The ultimate goal of this complex monitoring setting will be that of defining
the minimum monitoring set up to guarantee efficiency and safety of groundwater
withdrawals.
Acknowledgements
The authors wish to acknowledge GEAL spa for technical support and granting access to
the well field. The activities described in this paper are co-financed within the framework of
the EU FP7-ENV-2013-WATER-INNO-DEMO MARSOL (Grant Agreement n.
619120).
References
Borsi, I., Mazzanti, G., Barbagli, A., Rossetto, R., 2014. The riverbank filtration
plant in S. Alessio (Lucca): monitoring and modeling activity within EU the FP7
MARSOL project. Acque Sotterranee - Italian Journal of Groundwater, Vol. 3, n.
3/137
MARSOL (2014). Demonstrating Managed Aquifer Recharge as a Solution to Water
Scarcity and Drought www.marsol.eu [accessed 4 January 2015] |
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