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| Titel |
Field experiments and numerical simulations of phreatic aquifer response to pond infiltration at the eastern Alps foothills, Italy |
| VerfasserIn |
Pietro Teatini, Andrea Comerlati, Giovanni Paiero, Grazia Martelli, Tiago Carvalho, Anna Guetz, Francesco Fanzutti, Alessandro Affatato, Luca Baradello, Daniel Nieto, Stefano Bongiovanni, Giorgio Mattassi, Fabio Botti |
| Konferenz |
EGU General Assembly 2014
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 16 (2014) |
| Datensatznummer |
250097448
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| Publikation (Nr.) |
 EGU/EGU2014-13034.pdf |
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| Zusammenfassung |
| A large volume of surficial fresh high-quality water flows every year from the eastern Alps
foothills into the northern Adriatic sea through a number of rivers (e.g., the Tagliamento,
Isonzo, Livenza rivers). Crossing a highly permeable plain just south of the Alpine range, the
rivers naturally recharge along their course a thick phreatic aquifer mainly composed by
gravel and fractured conglomerates. The river waters are distributed across the territory
through a dense channel network used for irrigation during the hot season. From autumn to
spring this water could be used to recharge the aquifer through a number of large
infiltration ponds excavated in the early 2000s, but never used because of legislative
limitation. Within the WARBO LIFE+ project, the Environmental Agency of the region
has allowed to use the Mereto infiltration basin for recharging the aquifer, after
detailed test for surficial water quality and compatibility with the groundwater. The
pond is about 6 m deep and 45x7m2 wide. The site, which is characterized by an
elevation of 105 m above msl and a 50 m depth to the phreatic water table, has been
accurately characterized by geophysical (geoelectrical, georadar, seismic) surveys and a
number of 70 m deep boreholes drilled in the basin surroundings. The permeability
evaluated through pumping tests in these boreholes is on the order of 10-4m/s.
Recharge started in December 2013 with an infiltration on the order of 720 m3/day. The
collected data, i.e. the water volume flowed into the pond, its water level, and the
piezometric evolution in the wellbores around the basin have been used for the
calibration of a finite element three-dimensional variably-saturated flow model. The
calibrated model will be used to manage the full-scale recharge project in the future. |
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