Hi Niamh,
To set your initial water level use the key words
INITIAL WATER LEVEL = 4.2
To input an initial wave period use the following key words
WAVE PERIOD =
DIRECTION OF WAVE PROPAGATION =
To set up the wave height, you need to modify the subroutine BORH in the user Fortran File.
If you are using the v6p3 you will find many test cases, which will definitely help you, there:
C:\opentelemac-mascaret\v6p3\examples\artemis
Hope this helps
Juliette