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A standardised method for measuring in situ denitrification in shallow aquifers: numerical validation and measurements in riparian wetlands
1Laboratoire d’Ecologie des Hydrosystèmes (LEH, FRE CNRS-UPS 2630), 29 rue Jeanne Marvig, F-31055 Toulouse Cédex, France
2Group of Hydrogeology. University of Basque Country – Euskal Herriko Unibertsitatea, 48940 Leioa, Basque Country, Spain
Email for corresponding author : sanchez@ecolog.cnrs.fr
Abstract. A tracer test to examine in situ denitrification in shallow groundwater by a piezometer with a packer system used bromide as a tracer of dilution and acetylene (10%) to block the denitrification process at the nitrous oxide stage. During the test, dissolved oxygen, nitrate (NO3‾), bromide (Br‾), nitrous oxide (N2O) and dissolved organic carbon (DOC) were measured. To calibrate the experimental method, comparison with numerical simulations of the groundwater transfer were carried out, taking into account the environmental characteristics. The method was tested by measurements undertaken in different environmental conditions (geology, land use and hydrology) in two riparian wetlands. Denitrification rates measured by this method ranged from 5.7 10-6 g N-NO3‾L-1 h-1 to 1.97 10-3 g N-NO3‾L-1 h-1 The method is applicable in shallow aquifers with a permeability from 10-2 to 10-4m s-1.
Keywords: denitrification, shallowaquifer, groundwater modelling, wetlands, nitrate-nitrogen, packer system
Final Revised Paper (PDF, 693 KB)
Citation: Sánchez-Pérez, J. M., Bouey, C., Sauvage, S., Teissier, S., Antiguedad, I., and Vervier, P.: A standardised method for measuring in situ denitrification in shallow aquifers: numerical validation and measurements in riparian wetlands, Hydrol. Earth Syst. Sci., 7, 87-96, 2003. Bibtex EndNote Reference Manager
