Biogeochemical Modelling of a Seasonally Anoxic Lake: Calibration of Successive and Competitive Pathways and Processes in Lake Aydat,France |
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| Authors: | F A Lopes G Michard M Poulin A Roué F Prévot D Jézéquel E Viollier |
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| Institution: | 1.Laboratoire de Géochimie des Eaux,Université Paris Diderot et IPGP,Paris Cedex 05,France;2.Geosciences,Mines Paris Tech,Fontainebleau,France;3.Laboratoire de Génie des Procédés et Matériaux,Ecole Centrale Paris, Grande Voie des Vignes,Chatenay-Malabry,France |
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| Abstract: | A reactive transport model was developed to describe seasonal variations of biogeochemical and physical processes in Lake
Aydat. The model includes physical processes such as vertical mixing, sedimentation and advection related to inflows into
the lake and biogeochemical conversion processes in the water column and in the sediment surface layer. The reactions described
in the model include primary redox reactions such as primary production, aerobic and anaerobic respiration, methanogenesis
and secondary reactions established between oxidants and reducers produced by the primary reactions. After adjusting various
kinetic constants, the model reasonably reproduced the main features of seasonal variations of dissolved oxygen and nitrate
depth profiles and pH. The reactive transport model was also used to quantify the relative importance of different biogeochemical
pathways. For instance, ferrous denitrification seems to play an important role when stratification is increasing. |
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