I don't know a single word that would replace "a group of noisy people". There's a whole bunch of adjectives that could describe that group of people - amongst synonyms of noisy
(bolding ones that would match the situations best),:
chattering, disorderly, ear-popping, ear-splitting, loudmouth, rackety, raising Cain, raising the roof, rambunctious, riotous, rowdy, screaming, tumultous/tumultuous, turned up, uproarious
and quite a few nouns to describe the situation - synonyms of ruckus
disturbance, big scene, bother, brawl, commotion, disorder, disruption, fray, fuss, hubbub, racket, stir, turmoil, upheaval, uproar
snuffle - to breathe in quickly and repeatedly through the nose, usually because you are crying or because you have a cold
I can't stand your snuffling any longer.
snotty has more than one meaning- one of which is 'covered in snot'. It doesn't really describe the breathing in.
snuffler is not in the dictionary, but everybody would know what you mean if you said it about somebody that does it all the time.
He's a snuffler.
Best Answer
As StoneyB suggested, roar and crash of the surf are common descriptions. Roar is used in sense 4, “Generally, of inanimate objects etc., to make a loud resounding noise”, and crash in sense 3, “A loud sound as made for example by cymbals”.
Some other terms often used include pounding surf, in sense “Causing heavy or loud throbs”, and rumble of surf, in sense “A low pitched irregular noise, such as that of thunder or a hungry stomach”.
Ngrams for pounding surf,rumbling surf,rumble of surf,roaring surf,roar of surf,crashing surf shows pounding surf coming first since about 1930, before which time roaring surf was most common among those phrases. In recent years, crashing surf has pushed roaring surf out of second place. (It is possible other forms and combinations not included in that ngrams, such as “roar of the surf” instead of “roar of surf”, may occur more frequently; feel free to try different phrases, time periods, smoothing, etc.)
From en.wiktionary, susurrus means “A whispering or rustling sound; a murmur”; although susurrus obviously doesn't apply to loud surf, google for susurrus of the surf shows that phrase appearing in several recent books.