On the seabed in front of coastal structures sediment movement takes place due to incoming waves. The erosion of sediments creates a scour hole at the toe of structures such as embankments, breakwaters and dikes. This scour hole may lead to instabilities in the main structure due to material sliding into this hole. A common method of protecting against scour is the placement of a rubble mound toe structure and bed protection. The goal of this study is to better understand the background and main parameters that leads to scour, to predict the (location of the) maximum scour depth and how this is influenced by the bed protection. Consequently, the main research question of this thesis is: What is the expected, wave induced, scour depth over time in front of a sloped embankment, and what is the effect of a scour protection on the (location of the) maximum scour depth?