slack water at rocky beach during low tide with colors of sunrise in bright sky

algae amphidromic amplitude aqua astronomical bathymetry beach bright clouds coast coastal coastline colorful colors current cycle dawn daybreak daylight design diurnal dodge during ebb erosion island level levels light limit line low lowest marine morning motionless neap ocean oceanography oceanology pattern phase physics point pool rocks rocky science sea seascape seashore seaside semidiurnal shore sky skyscape slack stagnant stand still stones stony stream sunrise table tidal tide tideline variation water