. Beach changes at Holden Beach, North Carolina, 1970-74. Coast changes; Shore protection. Empirical eigenfunction analysis has been used successfully to show seasonal trends from beach profile data collected at Torrey Pines Beach, California (Aubrey, 1979). A similar analysis applied to the Holden Beach data set indicates a clear seasonal cycle in the first temporal demeaned eigenfunction for only four (profile lines 8, 10, 12,and 16) of the pro- file lines (Fig. 17). Profile line 16 Profile line 12 Profile line 10 Profile line 8. 1972 YEAR Figure 17. Seasonal trend in selected beach profiles
. Beach changes at Holden Beach, North Carolina, 1970-74. Coast changes; Shore protection. Empirical eigenfunction analysis has been used successfully to show seasonal trends from beach profile data collected at Torrey Pines Beach, California (Aubrey, 1979). A similar analysis applied to the Holden Beach data set indicates a clear seasonal cycle in the first temporal demeaned eigenfunction for only four (profile lines 8, 10, 12,and 16) of the pro- file lines (Fig. 17). Profile line 16 Profile line 12 Profile line 10 Profile line 8. 1972 YEAR Figure 17. Seasonal trend in selected beach profiles, shown by the first temporal eigenfunction with the mean removed. c. Short-Term Changes. (1) Dredging Operations. The Wilndngton District has performed maintenance dredging along the Atlantic Intracoastal Waterway (AIW-J) for a number of years. Holden Beach residents speculated that continued dredg- ing in the Lockwoods Folly channel exacerbated the already severe erosion problem at that end of the island. They argued that disposal of the mate- rial on the mainland shore removed a source of sand which, under certain conditions, protected or even nourished the island beach, so since 1967 the dredged material has been deposited along the east end of Holden Beach. Dredging operations with material being pumped across the island and depos- ited near profile line 2 are shown in the 19 71 aerial photo in Figure 2. Dredging records are incomplete for the BEP study period. Table 6 provides dredging dates with the available volumes either given or estimated. There were other reported dredging periods when material was not deposited on Holden Beach. 37. 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 Miller, Martin C; Coastal Engineering Research Center (U. S. ). Fort Belvoir, Va. : The Center ; Springfield, Va. : Na
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