This course covers three aspects of oceanography: waves, modelling and estuaries. Waves occur both on the surface of the ocean and within the ocean. Internal waves are important in mixing and sonar operations. After reviewing the basic principles of surface waves, this course presents the basics of internal waves, examining the dynamics, generation, propagation, and their impact on the ocean environment. Ocean modelling is a key component both in climate studies and naval operations. Basic modelling principles will be covered for both analytical and numerical ocean models with application to examples such as small-scale coastal systems, tsunamis, and the global ocean circulation. The dynamics of estuaries, embayments, and lagoons, and modelling of their flushing times and mixing regimes, in relation to the environmental quality of the land-sea margins may be introduced. This course may include a field school in Jervis Bay.