Ultimately, the 'correct' answer for many will be what the exam boards will be expecting... I'll ask Jon Wolton
I've been in examiners meetings where mark schemes have been adapted because "it says <such and such> in <a book> so we'd better let them have it even though it's not really right"... ;-)
I suspect uprush would be accepted and is quite possibly technically correct in that it's part of the whole swash process, although it's not a term I ever used back in the day. Wiki includes it and the definitions look reasonable (https://en.wikipedia.org/wiki/Swash
) and are sourced - although I've not verified either source. There are certainly other examples of the term being used in published literature - for example http://www.jstor.org/stable/4298413
- so it's not just something that a geography teacher made up (which, err, happens ime...), There are 40,000 or so g-hits for the search term uprush waves compared to 176,000 for swash waves - so it's certainly less used but still a term that seems technically correct.
I imagine either term is just fine.