MORPHODYNAMICS AND GEOLOGICAL LEGACY OF BERM SCARPS ALONG NON-TIDAL (UKRAINE) AND MICROTIDAL (THE BAHAMAS) COASTS
Journal Title: Вісник Одеського національного університету. Географічні та геологічні науки - Year 2014, Vol 19, Issue 2
Abstract
Berm scarps are erosional features characteristic of all coastal accumulation forms. Their profiles range from steep to overhanging (ψ>90) and evolve through slope adjustment and burial by swash and aeolian accretion. Examples from the mixed siliciclastic-bioclastic beaches of the non-tidal Black Sea coast of Ukraine and the microtidal oolitic-bioclastic carbonate islands of the Bahama Archipelago demonstrate a wide range of scarp morphologies. Truncations of berm strata and density lag at the scarp base accentuate their recognition in the field and in geophysical (georadar) records. Although ephemeral as surface features, berm scarps may act as nucleation sites for aeolian aggradation, thereby generating continuous coast-parallel dune ridges. Accumulation of organic debris promotes colonization of incipient foredunes by plants and provides chronological control of erosional events. Therefore, paleo-berm scarps serve as important geological indicators of past storm activity and aid in constraining sea-level position.
Authors and Affiliations
I. V. Buynevich, M. Savarese, S. V. Kadurin, E. P. Larchenkov, L. E. Park Boush, H. A. Curran, I. A. Beal
Keywords
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