This project aims to develop a (near-) real time hydrodynamic model of the Belgian Continental Shelf, southern North Sea, and to determine an accurate and easily accessible 3D description of the Lowest Astronomical Tide (LAT) surface, a so-called 'separation model'. To determine this LAT-surface the use of GNSS-buoys to acquire water heights in open sea is further developed. The hydrodynamic and morphological modelling along the Belgian coastline will be done using one or more numerical models adjusted to the specific needs of the project.