The size of the waves depends on the wind speed, the area over which it is blowing, and time. The water beneath a wave is disturbed to a depth of one-half the wavelength, and a wave is slowed when it ...The size of the waves depends on the wind speed, the area over which it is blowing, and time. The water beneath a wave is disturbed to a depth of one-half the wavelength, and a wave is slowed when it approaches shallow water. If the average wavelength of a series of waves is 100 m, at what depth of water will the waves start to feel the bottom, and how will that change their behaviour?