. Spiaggia cambia a Long Beach Island, New Jersey, 1962-73. Spiaggia di erosione costiera; modifiche. 75-| 50- ^ 2 5- e 0- -25 -50 -75-. Sondaggio 16 MAR.1973 figura 20. Schema del vento registrata a Atlantic City, marzo 1973, mostra forti venti di sud-ovest seguita da una tempesta di nord-est. Erosione non era particolarmente grave sulla lunga spiaggia Isola. b. I cambiamenti stagionali. Vi è un determinato ciclo stagionale associata alla frequenza e intensità delle tempeste registrati all'Atlantic City stazione di reporting (Fig. 10). Spiagge della costa occidentale rispondere alle differenze stagionali nel clima delle onde causate da tempeste invernali e exhibi

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. Beach changes at Long Beach Island, New Jersey, 1962-73. Beach erosion; Coast changes. 75-| 50- ^ 2 5- E 0- -25 -50 -75-. Survey 16 MAR.1973 Figure 20. Diagram of winds recorded at Atlantic City, March 1973, showing strong southwest winds followed by a northeast storm. Erosion was not particularly severe on Long Beach Island. b. Seasonal Changes. There is a definite seasonal cycle associated with the frequency and intensity of storms recorded at the Atlantic City reporting station (Fig. 10). West coast beaches respond to seasonal differences in wave climate caused by winter storms and exhibit a distinct bimodal character, being eroded with concave-upward profiles during winter and convex-upward pro- files in summer (Shepard, 1950; Komar, 1976; Fox and Davis, 1978). The sea- sonal signal, if it exists, may also be detected in the empirical eigenfunction analysis. The seasonal cycles are clearly discernible in the second temporal eigenfunction of Aubrey (1978) from studies conducted on Torrey Pines Beach. If the record is demeaned, a strong seasonal signal should show in the first beach eigenfunction. The ideal record from which to extract the seasonal sig- nal is one that is evenly and often sampled during all seasons. This requires at least monthly surveys of the profile sites. The sampling distribution for Long Beach Island was not evenly distributed as shown in Figure 4. Summer sea- sons, particularly during 1964-69, were infrequently sampled with some seasons missed completely. The other seasons were more frequently sampled since more beach changes were expected. Several periods of frequent sampling were selected during 1963 and again in 1969-71. Eigenfunction analysis was performed on selected profiles not directly adjacent to groins to determine a seasonal variation. A definite seasonal variability is seen in the first temporal eigenfunction (Fig. 21) with mean removed. The trend is not as marked as on west coast beaches. Profile lines 5 and 11 show a low at

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