Resumen
A bidimensional numerical model is used to simulate and to establish the most important mechanism that controls Sebastian Vizcaino Bay B.C. barotropic circulation. The observed circulation patterns were reproduced by the model; in particular anticyclonic gyre located East Cedros Island is predicted. This gyre has been described by hydrographic observations and direct data as a bay semipermanent circulation characteritic. Our results indicate the the gyre is generated by local wind field spatial variations.