CONICET | Buscador de Institutos y Recursos Humanos

The southern sector of the Samborombón Bay (Buenos Aires, Argentina) is anextensive marsh that is associated with an intertidal wetland environment. Differentengineering works were built to avoid tidal inflow and to increase the livestock grazingareas. The objective of this work is to assess if the regulation of tidal inflow causes achloride content change in the surface sediments, affecting the soil salinity of thewetland. Interpretation of satellite images, field surveys, sampling of sediments, andelectrical conductivity and levels measurements of surface and groundwater werecarried out. The results allowed us to recognize how engineering works (embankmentsand internal roads) alter the natural hydrological behavior, and, therefore the chloridecontent in the sediment. Soil salinization problems are recognized in areas wherethe tidal water accumulates and then evaporates forming halite precipitates. Futureengineering works should be planned so as to minimize the alteration of the water flowin order to achieve a sustainable management of natural resources in the wetland.

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