Abstract
Abstract Photographic observations of the whitecap coverage of large fresh water lakes were made in conjunction with measurements of wind velocity, and air and surface water temperatures. The fraction of the water surface covered by whitecaps shows an abrupt increase as the wind velocity increases from ∼7 to ∼8 m sec−1. This abrupt change is qualitatively in accord with the published observations of “critical” wind velocities associated with numerous other water-surface and surface-related phenomena. The whitecap coverage of fresh water bodies, particularly at the higher wind velocities, is much less than the published values of whitecap coverage of oceans under the same wind conditions.
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