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Institut de recherche pour la conservation des zones humides méditerranéennes

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Titre :	The Contribution of Groundwater Discharge to Nutrient Exports from a Coastal Catchment: Post-Flood Seepage Increases Estuarine N/P Ratios
Auteurs :	Isaac R. Santos, Auteur ; Jason de Weys, Auteur ; Douglas R. Tait, Auteur ; Bradley D. Eyre, Auteur
Type de document :	Article
Dans :	Estuaries and Coasts (36(1) JAN 2013)
Article en page(s) :	56-73
Résumé :	Four months of daily nutrient and radon (a natural groundwater tracer) observations at the outlet of a heavily drained coastal wetland illustrated how episodic floods and diffuse groundwater seepage influence the biogeochemistry of a sub-tropical estuary (Richmond River, New South Wales, Australia). Our observations downstream of the Tuckean Swamp (an acid sulphate soil floodplain) covered a dry stage, a flood triggered by a 213-mm rain event and a post-flood stage when surface water chemistry was dominated by groundwater discharge. Significant correlations were found between radon and ammonium and N/P ratios and between radon and dissolved organic nitrogen (DON) during the post-flood stage. While the flood lasted for 14 % of the time of the surface water time series, it accounted for 18 % of NH(4), 32 % of NO (x) , 66 % of DON, 58 % of PO(4) and 55 % of dissolved organic phosphorus (DOP) catchment exports. Over the 4-month study period, groundwater fluxes of 35.0, 3.6, 36.3, 0.5 and 0.7 mmol m(-2) day(-1) for NH(4), NO (x) , DON, PO(4) and DOP, respectively, were estimated. The groundwater contribution to the total surface water catchment exports was nearly 100 % for ammonium, and

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