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The AAPG/Datapages Combined Publications Database

Journal of Sedimentary Research (SEPM)

Abstract


Journal of Sedimentary Petrology
Vol. 52 (1982)No. 1. (March), Pages 233-249

Sequential Stage Development of Crescentic Bars: Hahoterim Beach, Southeastern Mediterranean

Victor Goldsmith, Dan Bowman, Kevin Kiley

ABSTRACT

Sequential bar development involving, in order, multiple bars, ridge and runnels, transverse/ oblique bars, and meandering or crescentic shore-attached or detached bars of both outer and nested inner systems were delineated at HaHoterim beach, northern Israel. The concomitant Previous HitwaveNext Hit data, including Previous HitwaveNext Hit directions, energy spectrum, significant Previous HitwaveNext Hit height, and length of the calm period showed strong correlation with the bar stages. There is a notable lack of correlation between bar stages and incident Previous HitwaveNext Hit periods, which were quite variable, even on a daily basis.

Two bar developmental sequences were delineated: one shore-normal and the other initially oblique but gradually rotating to shore-normal in the mature stage. Threshold conditions for the initial stage development of shore-normal crescentic systems were defined as H1/3 < 1.0 m, peak spectral density of < 1 m2/Hz, and swell directions within ± 7° from the normal. The outer crescentic systems formed within 1 to 2 weeks. The nested inner crescentic bar system formed under different Previous HitwaveNext Hit conditions. Development of inner micro-cresentic bars required 3 to 7 weeks of calm waves (H1/3 < 0.3 m), except for a short initiating pulse of Previous HitwaveNext Hit energy from waves of about i m in height. The double crescentic pattern indicates the optimal evolutiona y stage of crescentic systems. The residence time of bar Previous HittypesNext Hit was determined by the frequency of crossing of these threshold conditions.

The outer bars and the mega-rip channels composed the most stable inshore elements. Out-of-phase relationships between inner and outer bar systems resulted from the lag in response of the outer bars behind changes in Previous HitwaveNext Hit direction. Among the inner crescentic bars and shore rhythms, phase-correlation was the was the rule.

Regional aerial photography and Previous HitwaveNext Hit data indicate that the bar/Previous HitwaveNext Hit relationships at HaHoterim axe representative of the eastern flank of the Nile, including most of the Israeli coast. Although the bar Previous HittypesNext Hit described from other coasts are similar to those mapped at HaHoterim and the threshold Previous HitwaveNext Hit conditions for initiation of bar stage development appear to be similar, the frequency of occurrence of specific bar Previous HittypesTop appears to be different at HaHoterim.


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