The sound you're hearing is probably not the ocean, but the wind. Just go to the 'enviro' file, and add a semi-colon in front of every wind-related sound file name.
Code:
wind calm 15, 30
season spring, summer, autumn
climates test_climate, temperate_grassland_fertile, temperate_grassland_infertile, temperate_forest_open, temperate_forest_deep,
swamp, highland, alpine, sub_arctic
event volume 0
folder data/sounds/SFX/Environment/weather
;Wind_Calm_01
;Wind_Calm_02
end
wind breezes 20, 40
season spring, summer, autumn
climates test_climate, temperate_grassland_fertile, temperate_grassland_infertile, temperate_forest_open, temperate_forest_deep,
swamp, highland, alpine, sub_arctic
event
folder data/sounds/SFX/Environment/weather
;Wind_Breezes_02 volume -15
;Wind_Calm_01
end
etc...