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Erosion and accretion rates and their associated sediment characters along Ras El Bar coast, northeast Nile Delta, Egypt

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Environmental Geology

Abstract

Beach profile data, covering the coast of Ras El Bar, northeast Nile Delta, collected during the years from 1990 to 2002 combined with landsat images for the area and sedimentological investigation have been used to identify beach and nearshore seafloor sediment changes. Along the coast of Ras El Bar, two accretion sectors and one of erosion have been recognized. The first accretion sector is located west of Damietta harbour, where the harbour jetties have halted the littoral transport, while the second one is behind a system of detached breakwaters protecting Ras El Bar resort. Both the two sectors are characterized by growing shoreline with maximum rates ∼15 and 10 m/year, respectively. Also, they have maximum nearshore seafloor accretion rates of ∼18 and 22 cm/year, respectively. The erosion sector is located east of Damietta port and has a maximum rate of shoreline retreat ∼−10 m/year. Erosion of its nearshore seafloor is indicated recording a maximum rate of ∼−20 cm/year. The rate of net sediment volume change in the area indicates shifting of the accretion sector (II) westward, responding to installation of the new breakwaters unit. The two accretion sectors are characterized by dominance of moderately sorted fine sands in their shore area which change seaward into less sorting very fine sands. Beach sands of the eroded sector are poorly sorted medium grain size. The dominant constituents of heavy mineral species in beach and sea-bottom sands are the characteristic assemblages of the Nile deposits. The sands of the eroded zone are relatively enriched in monazite, zircon, tourmaline, garnet, and rutile.

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  1. Coastal Research Institute, Ras El Bar Coastal Research Station, St. # 77, Ras El Bar, Damietta, Egypt

    Mahmoud M. El Banna

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  1. Mahmoud M. El Banna
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Correspondence to Mahmoud M. El Banna.

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El Banna, M.M. Erosion and accretion rates and their associated sediment characters along Ras El Bar coast, northeast Nile Delta, Egypt. Environ Geol 52, 41–49 (2007). https://doi.org/10.1007/s00254-006-0447-2

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