International Journal of Marine Science, 2017, Vol.7, No.2, 8-18
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Figure 3 The displacement (migration) of Rosetta spit against time and its linear regression line during the period from 2007 to 2015
The obstruction of the spit between the period from 2003-2007 and due to the low discharges released
downstream Edfina Barrages to the sea after construction of High Aswan Dam (HAD), spit was formed inside the
end part of the estuary. It formed and grew perpendicular to the eastern shoreline of the estuary and enlarged in
size with time. It nearly enclosed the outlet as shown in Figure 2 (A). Different profiles of Rosetta Estuary
descriped the shrinkage of the navigational channel of the estuary at profile P4.5 due to the spit formation during
2007 (Figure 4). This problem causes navigation hazards, and nearly closure of the estuarine outlet. In addition, it
causes the economical bad effect due to the decrease the cross sections of Rosetta outlet region. It also control the
emergency discharges of the flood river water to the sea. This problem was solved by dredging. Dredging works
region of Rosetta Promontory increased the capacity of Rosetta promontory to pass high amount of discharge as
discussed by Mahmoud et al. (2006). Mohrig and his group discussed the case of closing the outlet due to
increasing sedimentation into the estuary inlet and harbor channels, which caused navigation hazards, and closure
of the lagoon inlets (Mohrig et al., 2000).
Figure 4 Profiles of Rosetta Estuary described the shrinkage of the navigational channel of the estuary due to the spit formation
during 2007
Note: The coordination of the spit is 31°27.87/ N and 30°22.065/ E
