Coastal erosion in relation to sea level changes, subsidence and river discharge, Nile delta coast
The Nile Delta coast has been dynamically unstable for centuries. Before 1900, its delta front was prograding seaward but after it began to retreat. Examination of the 1988 shoreline survey in relation to the 1909 shows that the total loss of land was 14.7 km2 for Rosetta, 0.44 km2 for Burullus an...
Elmentve itt :
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| Dokumentumtípus: | Cikk |
| Megjelent: |
University of Szeged, Department of Mineralogy, Geochemistry and Petrology
Szeged
1989
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| Sorozat: | Acta mineralogica-petrographica
30 |
| Kulcsszavak: | Kőzettan, Ásványtan, Földtan |
| Tárgyszavak: | |
| Online Access: | http://acta.bibl.u-szeged.hu/24778 |
| Tartalmi kivonat: | The Nile Delta coast has been dynamically unstable for centuries. Before 1900, its delta front was prograding seaward but after it began to retreat. Examination of the 1988 shoreline survey in relation to the 1909 shows that the total loss of land was 14.7 km2 for Rosetta, 0.44 km2 for Burullus and 21.0 km2 for Damietta. The maximum rate of erosion was found to be 58 m/year at west of Rosetta. Sea level gauges were installed for records along the coast. The tides are semi-diurnal in nature with two high and two low water levels in a tidal day. A considerable difference was found between water levels of summer and winter seasons. The swell action at Burullus during summer seasons and the effect of winter waves at Rosetta may cause the increasing of sea level and hence coastal erosion. Many evidences indicate that subsidence is partly responsible for erosion. A significant difference occurred in the Nile load prior and after 1900. The Nile flood levels became lower and the annual sediment load decreased. Furthermore, the closure of the Aswan High Dam in 1964 has reduced the flow and sediment load of the River Nile to insignificant quantities. Sea level rise and/or subsidence possibly coupled with reduction of the sediment load of the River Nile became paramount importance in recent coastal erosion along the Nile Delta coast. |
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| Terjedelem/Fizikai jellemzők: | 161-170 |
| ISSN: | 0365-8066 |