Introduction to estuarine studies.- Circulation and mixing in estuaries.- Estuarine classification.- Physical properties and estuarine experiments.- Reduction and analisis of experimental data: flux and transport of properties.- Mixing processes in estuaries: Simplified methods.- hydrodynamic formulation: Conservation equations of mass, salt and applications.- Hydrodynamic formulation: equations of motion and applications.- Circulation and mixing in steady-state models: Salt wedge type.- Circulation and mixing in steady-state models: Well-mixed estuary.- Circulation and mixing in steady-state models: Partially mixed estuaries.- Numerical hydrodynamic modelling.