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| Titel |
Estimating annual groundwater recharge coefficient for karst aquifers of the southern Apennines (Italy) |
| VerfasserIn |
V. Allocca, F. Manna, P. De Vita |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1027-5606
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| Digitales Dokument |
URL |
| Erschienen |
In: Hydrology and Earth System Sciences ; 18, no. 2 ; Nr. 18, no. 2 (2014-02-27), S.803-817 |
| Datensatznummer |
250120292
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| Publikation (Nr.) |
 copernicus.org/hess-18-803-2014.pdf |
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| Zusammenfassung |
To assess the mean annual groundwater recharge of the
karst aquifers in the southern Apennines (Italy), the estimation of the mean
annual groundwater recharge coefficient (AGRC) was conducted by means of an
integrated approach based on hydrogeological, hydrological,
geomorphological, land use and soil cover analyses. Starting from the
hydrological budget equation, the coefficient was conceived as the ratio
between the net groundwater outflow and the precipitation minus actual
evapotranspiration (P − ETR) for a karst aquifer. A large part of the southern
Apennines, which is covered by a meteorological network containing 40
principal karst aquifers, was studied. Using precipitation and air
temperature time series gathered through monitoring stations operating in
the period 1926–2012, the mean annual P − ETR was estimated, and its
distribution was modelled at a regional scale by considering the orographic
barrier and rain shadow effects of the Apennine chain, as well as the
altitudinal control. Four sample karst aquifers with available long spring
discharge time series were identified for estimating the AGRC. The resulting
values were correlated with other parameters that control groundwater
recharge, such as the extension of outcropping karst rocks, morphological
settings, land use and covering soil type. A multiple linear regression
between the AGRC, lithology and the summit plateau and endorheic areas was
found. This empirical model was used to assess the AGRC and mean annual
groundwater recharge in other regional karst aquifers. The coefficient was
calculated as ranging between 50 and 79%, thus being comparable with
other similar estimations carried out for karst aquifers of European and
Mediterranean countries. The mean annual groundwater recharge for karst
aquifers of the southern Apennines was assessed by these characterizations and
validated by a comparison with available groundwater outflow measurements.
These results represent a deeper understanding of an aspect of groundwater
hydrology in karst aquifers which is fundamental for the formulation of
appropriate management models of groundwater resources at a regional scale,
also taking into account mitigation strategies for climate change impacts.
Finally, the proposed hydrological characterizations are also supposed to be
useful for the assessment of mean annual runoff over carbonate mountains,
which is another important topic concerning water management in the southern Apennines. |
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