Shoreline changes and beach-sand sorting along the northern Sinai coast of Egypt |
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Authors: | O E Frihy M F Lotfy |
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Institution: | (1) Coastal Research Institute, 15 El Pharaana Street, 21514, El Shallalat, Alexandria, Egypt, EG |
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Abstract: | Changing shoreline positions along the Sinai coast of Egypt were determined by comparing aerial photographs and historical
charts with present-day conditions. The analyses identify longshore patterns wherein erosion along a protruding stretch of
the coast gives way to accretion in an adjacent major embayment. This pattern defines two coastal subcells consisting of source/sink
couplets. There is a general correspondence between the mineral variation, grain sizes of beach sand, and the patterns of
shoreline changes. Associated with erosion/ accretion shoreline change is a selective transport of different minerals according
to their densities and grain sizes. Two heavy-mineral groups were obtained by applying Q-mode factor analysis on the heavy-mineral
data. These two groups are influenced by transport processes, including sediment provenance from different sources: eroded
Nile delta west of Sinai, relict sediments from the former Nile distributaries, and sediment supply by land valleys and from
wind-blown sand.
Received: 2 June 1995 / Revision received: 29 May 1996 |
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