Deuterium labeling of unsaturated zone water movement in semi-arid climate of Rajasthan, India

Theresa Frommen1, Paul Königer2, Maike Gröschke2
1 IRI THESys, Humboldt-Universität zu Berlin
2 Abteilung für Grundwasser und Boden, BGR Hannover

11.3 in Isotopenmethoden zur Analyse von Stoffumsatz und Fließprozessen

In a semi-arid area in Rajasthan, India, close to the capital Jaipur, the deuterium (2H) labeling technique was applied using deuterated water (2H2O) to gain information on soil water movement and groundwater recharge processes via unsaturated zone studies. At a study site on barren land next to a farmhouse and surrounded by agriculture, 100 ml of 70% 2H2O was mixed with 15 L of the local groundwater and applied on a 1m² plot at a depth of 20 cm. The displacement of the 2H-peak was detected 1 day and 1 month (34 days) after the application as well as after the rainy season 10 months later (321 days). We will show results of the water content and 2H concentrations in 10-cm resolution along the depth profiles. Chances and limitations of a single-tracer application using the peak displacement method in semi-arid climates will be discussed.