涌
chōng , yǒng · HSK 7
to rush forth
🌊 涌 = water 氵 + 甬 (yǒng, lane) → water rushes down the lane and gushes up
The 氵 water radical means it's about liquid; 甬 (yǒng) supplies the yǒng sound. So water that bubbles up or rushes forth. Read yǒng for gush, chōng in place names.
涌 — water radical 氵 + 甬 (yǒng, phonetic)
A semantic-phonetic compound: 氵 (water) gives the meaning, while 甬 supplies the sound. It originally described water gushing or welling up from a spring, and by extension came to mean any surging or swelling motion, as in waves or crowds.