δείτε την πρωτότυπη σελίδα τεκμηρίου στον ιστότοπο του αποθετηρίου του φορέα για περισσότερες πληροφορίες και για να δείτε όλα τα ψηφιακά αρχεία του τεκμηρίου*
The Effect of Beach Rock Formation on the Morphological Evolution of a
Beach. The Case Study of an Eastern Mediterranean Beach: Ammoudara,
Greece
The present work investigates the decadal morphological evolution of a
microtidal, perched beach and the effect that beach rock formations can
have on coastal morphology. Using historical and recent morphological
observations from Ammoudara Beach on the island of Crete, Greece, and
numerical modeling, the interaction of beach rock formation and
retreating coastline are investigated. The principal feature of the
morphological evolution of the coastal zone under investigation has been
the transformation of a beach rock formation, initially attached to the
shoreface (1950s), to a submerged reef that is aligned subparallel to
the present-day shoreline. At present, the beach rock is attached to the
shoreface at sea level at the western part of the beach, but it has
evolved to a submerged reef toward the east, being approximately 40 m
off the shoreline at the central part and 70 m off the coastline at the
eastern part of the beach. This kind of beach evolution is attributed to
the interplay of natural hydrodynamic and sediment transport processes
(that. have been changing as the beach rock formation evolved to an
offshore submerged reef) and to human intervention. The latter is
exhibited mainly as changes in the sediment supply to the coastal zone
(e.g., reduction in terrestrial freshwater/sediment influx,
deterioration of sand dune field, and arbitrary abstraction of beach
material). After a period of readjustment of the nearshore hydrodynamics
to the changing morphology and vice versa, it seems that, at present,
Ammoudara Beach has attained a new morphodynamic equilibrium where the
shore-parallel reef acts as a submerged breakwater.
(EN)
*Η εύρυθμη και αδιάλειπτη λειτουργία των διαδικτυακών διευθύνσεων των συλλογών (ψηφιακό αρχείο, καρτέλα τεκμηρίου στο αποθετήριο) είναι αποκλειστική ευθύνη των αντίστοιχων Φορέων περιεχομένου.
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