Lake and coastal modelling
Often, lakes, estuaries and larger scale coastal areas are complex dynamical systems with exchange pathways that bare critically dependent on topography (complex embayments) and baroclinic dynamics (internal waves, entrainment, etc.). These processes can be more or less adequately represented by dynamical models; usually a 3d model is useful. The Princeton model has been used in conjunction with a dynamical study of  several Irish Lakes, e.g. Mask and Corrib, and Esthwaite Water in England

Topographically governed circulation is also  very important in such areas of complex bathymetry and coastline; in coastal areas, tidal flow often governs mixing. These processes can sometimes be represented using a 2d model. For lakes as for coastal areas, density is crucial for the circulation, so usually a full 3d model is desirable. A study of Lough Mask can be found here

Possible work:
-Modelling: flow and dispersion studies