 |
| Titel |
An approach to identify urban groundwater recharge |
| VerfasserIn |
E. Vázquez-Suñé, J. Carrera, I. Tubau, X. Sanchez-Vila, A. Soler |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
1027-5606
|
| Digitales Dokument |
URL |
| Erschienen |
In: Hydrology and Earth System Sciences ; 14, no. 10 ; Nr. 14, no. 10 (2010-10-27), S.2085-2097 |
| Datensatznummer |
250012456
|
| Publikation (Nr.) |
 copernicus.org/hess-14-2085-2010.pdf |
|
|
|
|
|
| Zusammenfassung |
| Evaluating the proportion in which waters from different origins are mixed
in a given water sample is relevant for many hydrogeological problems, such
as quantifying total recharge, assessing groundwater pollution risks, or
managing water resources. Our work is motivated by urban hydrogeology, where
waters with different chemical signature can be identified (losses from
water supply and sewage networks, infiltration from surface runoff and other
water bodies, lateral aquifers inflows, ...). The relative contribution of
different sources to total recharge can be quantified by means of solute
mass balances, but application is hindered by the large number of potential
origins. Hence, the need to incorporate data from a large number of
conservative species, the uncertainty in sources concentrations and
measurement errors. We present a methodology to compute mixing ratios and
end-members composition, which consists of (i) Identification of potential
recharge sources, (ii) Selection of tracers, (iii) Characterization of the
hydrochemical composition of potential recharge sources and mixed water
samples, and (iv) Computation of mixing ratios and reevaluation of
end-members. The analysis performed in a data set from samples of the
Barcelona city aquifers suggests that the main contributors to total
recharge are the water supply network losses (22%), the sewage network
losses (30%), rainfall, concentrated in the non-urbanized areas (17%),
from runoff infiltration (20%), and the Besòs River (11%).
Regarding species, halogens (chloride, fluoride and bromide),
sulfate, total nitrogen, and stable isotopes (18O, 2H, and
34S) behaved quite conservatively. Boron, residual alkalinity, EDTA and
Zn did not. Yet, including these species in the computations did not affect
significantly the proportion estimations. |
| |
|
| Teil von |
|
|
|
|
|
|
|
|