Chemical variation of surface water and groundwater in relation to water balance in the watershed of El Pescado Creek (C
- PDF / 2,232,190 Bytes
- 10 Pages / 595.276 x 790.866 pts Page_size
- 65 Downloads / 184 Views
THEMATIC ISSUE
Chemical variation of surface water and groundwater in relation to water balance in the watershed of El Pescado Creek (Central‑Eastern Argentina) María Isabel Delgado1,2 · Eleonora Carol3 · María Elicia Mac Donagh4 · María Adela Casco2 Received: 6 March 2020 / Accepted: 13 August 2020 © Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract The watershed of El Pescado Creek has been established as a protected landscape; however, it is currently exposed to an intense land use and coverage change process, based on the conversion of grassland areas into greenhouse horticulture and urbanized areas. The aim of this work was to analyze hydrochemical modifications in this changing scenario, to identify parameter variations associated to water balance. The monitory network included surface water and groundwater samplings during winter, spring and summer of 2017. Daily water balance was estimated throughout the annual cycle. Electrical conductivity and pH were determined together with major ions ( Na+, K+, Mg2+, Ca2+, CO32−, HCO3−, Cl−, SO42− and N O3−). 18 2 The analysis of water stable isotopes (δ O and δ H) was performed for one sampling date. Water-balance variations during short-term periods affected surface water chemistry, although no relevant influence on deep groundwater was registered. Major ions variation in the surface water of the upper watershed might be related to runoff alteration caused by recently established impervious cover and by the dynamic of groundwater inputs. Isotopic analysis of surface water shows deviation from local meteoric line, with an isotopic enrichment following a tendency associated to evaporation processes. Deep groundwater samples express a recharge process by rainfall infiltration, with little or no previous evaporation (deuterium amounts were similar to those corresponding to local rainfall). Incipient evaporation processes are registered for shallow groundwater, possibly occurring before infiltration in the non-saturated zone, or right from the phreatic, when it is near the surface. Keywords Major ions · Water stable isotopes · Flatland watershed · Water balance · Seasonal variation
This article is a part of the Topical Collection in Environmental Earth Sciences on “Advances in Environmental Geochemistry” guest edited by Dr. Eleanor Carol, Dr. Lucia Santucci and Dr. Lia Botto. * María Isabel Delgado [email protected]
3
Facultad de Ciencias Naturales y Museo, Centro de Investigaciones Geológicas (CIG), Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET-UNLP), Universidad Nacional de La Plata, Diagonal 113, N° 275, B1904DPK La Plata, Argentina
4
División Ficología, Museo de La Plata, Facultad de Ciencias Naturales y Museo, Universidad Nacional de La Plata, Paseo del Bosque S/N, B1900FWA La Plata, Argentina
Eleonora Carol [email protected] María Elicia Mac Donagh [email protected] María Adela Casco [email protected] 1
Facultad de Ciencias Agrarias y Forestales, Universid
Data Loading...
