Could you clarify the question a bit pls?
Are you wanting to evaluate the wave force to design the barge hull scantlings (eg side wall plate thickness) or for motion analysis, mooring etc ? If the latter, Faltinsen's book, as recommended by jfduroch, is the right sort of reference, alternatively Chakrabarti (probably spelt wrong but an excellent well -known book). If the former, you can simply use the hydrodynamic pressure (eg from Airy wave theory).