Abstract.-The Navachiste Lagoon System is connected to the Gulf of California (GC) via 3 tidal channels. The system has an area of approximately 301 km 2 , with an average depth of 2.5 m and an average tide height of 1.5 m. In order to simulate tidal currents and the effect of wind, a numerical hydrodynamic model was applied, integrated in the vertical and in finite differences; to calibrate the model, lagrangean measurements were made and compared with simulated currents in the tidal channels of the system. The model simulates the hydrodynamic behavior of the lagoon system and has a correlation higher than 85% with the trajectories traced by the drift bodies and with the maximum Eulerian velocities measured in the internal channels and in the mouths of the system. Resumen.-El Sistema Lagunar Navachiste se encuentra conectado con el Golfo de California (GC) a través de 3 canales de marea. El sistema cuenta con un área de 301 km 2 aproximadamente, con una profundidad promedio de 2,5 m y una altura de mareas promedio de 1,5 m. Para simular las corrientes de mareas y el efecto del viento se aplicó un modelo hidrodinámico numérico barótropico, integrado en la vertical y en diferencias finitas; para calibrar el modelo se hicieron mediciones lagrangeanas y se compararon con las corrientes simuladas en los canales de marea del sistema. El modelo simula el comportamiento hidrodinámico del sistema lagunar y presenta una correlación superior al 85% con las trayectorias trazadas por los cuerpos de deriva y con las velocidades máximas eulerianas medidas en los canales internos y en las bocas del sistema.Palabras clave: Corrientes de marea, lagunas costeras, simulación de corrientes, modelo hidrodinámico numérico, Sistema Lagunar San Ignacio -Navachiste -Macapule
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