. Directional characteristics of waves in shallow water. Ocean waves; Wind waves; Water waves. may be attributed to the fact that the integrated direction spectrum includes contributions from waves at all frequencies, including those at high frequen- cies. High-frequency waves tend to be less influenced by refraction for a given shoaling propagation path. The effect is to add enough high-frequency energy to the integrated direction spectrum to shift its peak relative to the singular peak of the frequency-direction spectrum. Figure 7 is a good example of this. In Figure 7, the peak of the frequ
. Directional characteristics of waves in shallow water. Ocean waves; Wind waves; Water waves. may be attributed to the fact that the integrated direction spectrum includes contributions from waves at all frequencies, including those at high frequen- cies. High-frequency waves tend to be less influenced by refraction for a given shoaling propagation path. The effect is to add enough high-frequency energy to the integrated direction spectrum to shift its peak relative to the singular peak of the frequency-direction spectrum. Figure 7 is a good example of this. In Figure 7, the peak of the frequency-direction spectrum is at a low-frequency lobe centered near -30 deg. However, because there is a lot of high-frequency energy at positive angles, the integrated direction spectrum (left rear vertical panel) has a peak near 10 deg. This creates a 40-deg difference in the two measures of peak direction. 184. The scatter resulting from this type of difference is shown in Figure 12 which is a correlogram of the two measures of peak direction. The diagonal line is the perfect correlation reference. Fewer than 1,046 symbols are visible because both measures of peak direction are discrete. Hence, one symbol location may represent several observations. The figure shows a gross. Figure 12. Correlation of peak directions from integrated direction spectrum and frequency-direction spectrum 72. 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 Long, Charles E; Oltman-Shay, Joan; U. S. Army Engineer Waterways Experiment Station; Coastal Engineering Research Center (U. S. ); United States. Army. Corps of Engineers. [Vicksburg, Miss. : U. S. Army Engineer Waterways Experiment Station ; Springfield, Va. : available from National Technical Information Service]
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