. Bulletin of the Beach Erosion Board. Shore protection; Beach erosion. characteristics. A group of waves, all of the same period, will travel in deep water with a velocity known as the group velocity (Cg - knots), while any one wave in the group will travel with a velocity C - knots. (Deep water waves are those that are moving in depths greater than one-half their wave length). $, Growth and Decay of Wind Waves. - An area of sea over which wind has been blowing and generating waves is known as a fetch. The growth of wavea within a fetch is governed by three factors: the speed of t
. Bulletin of the Beach Erosion Board. Shore protection; Beach erosion. characteristics. A group of waves, all of the same period, will travel in deep water with a velocity known as the group velocity (Cg - knots), while any one wave in the group will travel with a velocity C - knots. (Deep water waves are those that are moving in depths greater than one-half their wave length). $, Growth and Decay of Wind Waves. - An area of sea over which wind has been blowing and generating waves is known as a fetch. The growth of wavea within a fetch is governed by three factors: the speed of the wind (U), the length of time this wind has been blowing, known as the duration (t), and the length of the fetch (f). In a nongrowing fetch, a constant wind speed will develop waves limited in height and period at first by the duration of the wind, then by the length of the fetch. 6. At an early stage of development of the waves, their heights or periods at various points within the fetch will be distributed as shown by the dashed line of Figure 1. At a later stage of development the distribu- tion of wave heights or periods will be as given by the solid line of Figure 1,. Fetch Length WAVE DEVELOPMENT WITHIN A FETCH FIGURE I. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original United States. Beach Erosion Board. [Washington, D. C. ] : The Board
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