the COE has been slow to issue it's newest shoreline protection manual which is now named Coastal Engineering Manual (CEM). this manual provides some more recent information about nearshore waves in the section II-4 "Surf Zone Hydrodynamics". however they are quick to point out that they have...
you might want to try the corps of engineer's engineering manuals and techinical reports website. they have a wealth of knowledge. however, they were written by engineers so they can be a little confusing. i hope it helps.
http://www.usace.army.mil/inet/usace-docs/eng-manuals/em.htm