The purpose of this study was to analyze water circulation in an estuary located in Boca del Río, Veracruz, Mexico. The diagnosis is based on the most representative flux records for the Jamapa River during the dry and rain seasons, that is, April and September, respectively. Tidal conditions, temperature, and water density were taken into account. For the diagnosis, a three-dimensional model (Delft3D) was applied. The seasonal circulation governing the estuary was evaluated using barotropic and baroclinic pressure levels. During the dry season, estuarine circulation was governed by the tides, and water circulation in the Mandinga lagoons was induced by baroclinic conditions. During the rainy season, the estuarine system was governed by discharge from the Jamapa River, and water circulation in the Mandinga lagoons is influenced by barotropic gradients.Resumen. Este estudio analiza la circulación de agua en el estuario de Boca del Río, Veracruz, México. El diagnóstico se basa en los registros disponibles de los flujos del río Jamapa durante las estaciones de estiaje y lluvia, es decir, durante abril y septiembre, respectivamente. Los regímenes de mareas, la temperatura y los valores de densidad del agua fueron tomados en cuenta. Para el dignóstico, se aplicó un modelo en 3 dimensiones (Delft3D). La circulación estacional del agua en el estuario se evaluó de acuerdo con los niveles de presión barotrópica y presión baroclínica. Durante la temporada de estiaje, la circulación en el estuario se rigió por las mareas, mientras que la circulación en las lagunas de Mandinga es inducida por condiciones baroclínicas. Durante la temporada de lluvias, el estuario se rigió por la descarga del río Jamapa, y la circulación del agua en las lagunas de Mandinga dependió de los gradientes barotrópicos.Palabras clave: estuario, Delft3D, barotrópico, baroclínico, salinidad.
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