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Oxygen and hydrogen isotopic composition of major Indian rivers: a first global assessment

Lambs, Luc and Balakrishna, K. and Brunet, Frédéric and Probst, Jean-Luc Oxygen and hydrogen isotopic composition of major Indian rivers: a first global assessment. (2005) Hydrological Processes, vol. 1 (n° 17). pp. 3345-3355. ISSN 0885-6087

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Official URL: http://dx.doi.org/10.1002/hyp.5974

Abstract

Nine major rivers have been sampled around the Indian subcontinent to give an overview of the surface water characteristics. Both 18O and deuterium have been measured to determine the origin of the water and the possible evapotranspiration process. The major ions have also been analysed to obtain complementary information. Although some basins have been studied previously (mainly in the north), this is the first attempt at a wider investigation of major Indian rivers. The results are discussed from the perspective of the hydroclimatological, geographical and geological specificity of the river basins. υ18O values vary from light-isotope-enriched Himalayan rivers to heavyisotope- enriched peninsular Indian rivers in a northwest–southeast gradient across the subcontinent. There is more evapotranspiration, leading to heavy isotope enrichment, in the peninsular (southern Deccan) rivers compared with the light-isotope-enriched snow- and glacier-melt-derived waters of the Himalayan rivers. The υ18O values of Indian rivers correspond roughly to the υ18O values of the rains falling over the subcontinent. However, the influence of tributaries is dominant over rainfall in rivers like the Narmada and Tapti. The Cauvery and Krishna rivers show maximum evapotranspiration and sodium pollution, as indicated by the υ18O values, deuterium excess and major ion data.

Item Type:Article
Additional Information:Thanks to Wiley editor. The definitive version is available at http://www3.interscience.wiley.com/cgi-bin/home The original PDF of the article can be found at Hydrological Processes website : http://www3.interscience.wiley.com/journal/4125/home
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution: Université de Toulouse > Institut National Polytechnique de Toulouse - INPT
French research institutions > Institut de Recherche pour le Développement - IRD
Université de Toulouse > Université Paul Sabatier-Toulouse III - UPS
French research institutions > Centre National de la Recherche Scientifique - CNRS
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Deposited By: Florence Amor

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