Geochemistry of the Adige River water from the Eastern Alps to the Adriatic Sea (Italy): evidences for distinct hydrological components and water-rock interactions

• Published in: Environmental science and pollution research international Vol. 23; no. 12; pp. 11677 - 11694
• Main Authors: Natali, C., Bianchini, G., Marchina, C., Knöller, K.
• Format: Journal Article
• Language: English
• Published: Berlin/Heidelberg Springer Berlin Heidelberg 01-06-2016; Springer Nature B.V
• Subjects: Alluvial plains; Aquatic Pollution; Atmospheric Protection/Air Quality Control/Air Pollution; Chemical analysis; Chemical composition; Climate change; Creeks & streams; Datasets; Drought; Earth and Environmental Science; Ecotoxicology; Environment; Environmental Chemistry; Environmental Health; Environmental science; Fresh Water; Geochemistry; Geological Phenomena; Groundwater; Hydrologic cycle; Hydrology; Italy; Low flow; Research Article; River flow; River mouth; Rivers; Rivers - chemistry; Seawater; Studies; Total dissolved solids; Waste Water Technology; Water; Water analysis; Water inflow; Water Management; Water Pollution Control; Winter; Adige River; Italy; MED, Italy; MED, Adriatic Sea; Italy, Adige R; Italy, Alps Mts; Adige River; Water geochemistry; Water-rock interactions; Stable isotopes; Hydrological components
• ISSN: 0944-1344; 1614-7499
• DOI: 10.1007/s11356-016-6356-3

The Adige River flows from the Eastern Alps to the Adriatic Sea and the understanding of its fluvial dynamics can be improved by geochemical and O-H isotopic investigation. The most negative isotopic compositions are recorded close to the source (δ
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O between −14.1 and −13.8 ‰, δD between −100.3 and −97.0 ‰), and δD and δ
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O values generally increase downstream through the upper part (UP, the mountainous sector), stabilizing along the lower part (LP, the alluvial plain) of the river with δ
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O between −12.4 and −11.8 ‰, δD between −86.9 and −83.7 ‰. The isotopic variations along the stream path (δ
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O-δD vs distance from the source) depict subparallel distributions for all the investigated periods, with less negative values recorded in winter. Total dissolved solids (TDS) concentration shows the lowest value (<100 mg/l) at the river source, jumping to 310 mg/l at the Rio Ram inflow, then decreasing down to the Isarco River confluence; from here, we observed an increase toward the river mouth, with different values in the distinct sampling periods. The lowest values (140–170 mg/l) were recorded during high discharge in spring, whereas higher TDS values (up to 250 mg/l) were recorded during winter low flow conditions. Extreme TDS values were observed in the estuarine samples (up to 450 mg/l), as result of mixing with seawater. The results allow for the identification of distinct water end-members: glacio-nival component(s) characterized by the most negative isotopic composition and extremely low TDS, a rainfall component characterized by intermediate isotopic and elemental composition and groundwater characterized by the less negative isotopic composition and comparatively higher TDS. An additional component is represented by seawater, which is recorded at the lowest reach of the river during drought periods. These contributions variously mix along the stream path in the distinct hydrological periods, and the presented data are a snapshot of the current hydroclimatic conditions. Future investigations will evaluate possible hydrological variations related to meteo-climatic changes. Monitoring is fundamental for future water management to overcome the vanishing of a significant water end-member of the basin, i.e., the glacio-nival reservoir that is severely affected by the ongoing climatic changes.