La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

Titre :	Spatial Distribution of Dissolved Radon in the Choptank River and Its Tributaries: Implications for Groundwater Discharge and Nitrate Inputs
Auteurs :	Karen L. Knee, Auteur ; Thomas E. Jordan, Auteur
Type de document :	Article
Dans :	Estuaries and Coasts (36(6) NOV 2013)
Article en page(s) :	1237-1252
Résumé :	The Choptank River, Chesapeake Bay's largest eastern-shore tributary, is experiencing increasing nutrient loading and eutrophication. Productivity in the Choptank is predominantly nitrogen-limited, and most nitrogen inputs occur via discharge of high-nitrate groundwater into the river system's surface waters. However, spatial patterns in the magnitude and quality of groundwater discharge are not well understood. In this study, we surveyed the activity of Rn-222, a natural groundwater tracer, in the Choptank's main tidal channel, the large tidal tributary Tuckahoe Creek, smaller tidal and non-tidal tributaries around the basin, and groundwater discharging into those tributaries, measuring nitrate and salinity concurrently. Rn-222 activities were

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