waves, billows
濤 centers on large, surging water: waves and billows, especially the kind that rise and roll powerfully.
濤 combines 氵 (water) with 壽, which likely provides the sound and carries an extended sense of something prolonged or drawn out, fitting the image of long rolling waves.
Water 氵 beside 壽, a shape associated with longevity, suggests waves that keep coming endlessly: billow after billow.
For トウ, imagine a towering wave: tower -> トウ, and the water radical 氵 makes it a towering billow.
sound of wind rustling in the pine needles (like waves)
surging sea; rough sea; large waves
faraway lands; voyage to faraway lands
Shoto Museum of Art
sound of waves (breaking onto shore)
storm and stress; Sturm und Drang
wind and waves