Vulnerability of the Nile Delta coastal areas to inundation by sea level rise

Sea level changes are typically caused by several natural phenomena, including ocean thermal expansion, glacial melt from Greenland and Antarctica. Global average sea level is expected to rise, through the twenty-first century, according to the IPCC projections by between 0.18 and 0.59 cm. Such a rise in sea level will significantly impact coastal area of the Nile Delta, consisting generally of lowland and is densely populated areas and accommodates significant proportion of Egypt’s economic activities and built-up areas. The Nile Delta has been examined in several previous studies, which worked under various hypothetical sea level rise (SLR) scenarios and provided different estimates of areas susceptible to inundation due to SLR. The paper intends, in this respect, to identify areas, as well as land use/land cover, susceptible to inundation by SLR based upon most recent scenarios of SLR, by the year 2100 using GIS. The results indicate that about 22.49, 42.18, and 49.22 % of the total area of coastal governorates of the Nile Delta would be susceptible to inundation under different scenarios of SLR. Also, it was found that 15.56 % of the total areas of the Nile Delta that would be vulnerable to inundation due to land subsidence only, even in the absence of any rise in sea level. Moreover, it was found that a considerable proportion of these areas (ranging between 32.32 and 53.66 %) are currently either wetland or undeveloped areas. Furthermore, natural and/or man-made structures, such as the banks of the International Coastal Highway, were found to provide unintended protection to some of these areas. This suggests that the inundation impact of SLR on the Nile Delta is less than previously reported.

[1]  M. El-Raey,et al.  Vulnerability assessment of the coastal zone of the Nile delta of Egypt, to the impacts of sea level rise , 1997 .

[2]  Robert J. Nicholls,et al.  Economic impacts of climate change in Europe: sea-level rise , 2012, Climatic Change.

[3]  F. Gómez.  The role of the exchanges through the Strait of Gibraltar on the budget of elements in the Western Mediterranean Sea: consequences of human-induced modifications. , 2003, Marine pollution bulletin.

[4]  Alaa H. ElNahry,et al.  Climate change and its impacts on the coastal zone of the Nile Delta, Egypt , 2010 .

[5]  M. El-Raey,et al.  Change detection of Rosetta promontory over the last forty years , 1995 .

[6]  O. Frihy,et al.  The Nile delta-Alexandria coast: vulnerability to sea-level rise, consequences and adaptation , 2003 .

[7]  Daisuke Mizuno,et al.  A Semi-Empirical Approach to Projecting Future Sea-Level Rise , 2007 .

[8]  M. Bahnassy,et al.  Vulnerability assessment and adaptation to the impacts of sea level rise on the Kingdom of Bahrain , 2007 .

[9]  S. Somot,et al.  21st century Mediterranean sea level rise: steric and atmospheric pressure contributions from a regional model , 2008 .

[10]  Daniel Kleppner,et al.  Research Data in the Digital Age , 2009, Science.

[11]  M. El-Raey,et al.  Potential Impacts of Accelerated Sea-Level Rise on Alexandria Governorate, Egypt , 1995 .

[12]  Á. Borja,et al.  Regional scenarios of sea level rise and impacts on Basque (Bay of Biscay) coastal habitats, throughout the 21st century , 2010 .

[13]  S. Nasr,et al.  Change detection of the northeastern Nile Delta of Egypt: Shoreline changes, Spit evolution, margin changes of Manzala lagoon and its islands , 1998 .

[14]  S. Temmerman,et al.  Limits on the adaptability of coastal marshes to rising sea level , 2010 .

[15]  S. Nasr,et al.  Remote sensing of beach erosion along the Rosetta promontary, northwestern Nile delta, Egypt , 1994 .

[16]  W. T. Pfeffer,et al.  Kinematic Constraints on Glacier Contributions to 21st-Century Sea-Level Rise , 2008, Science.

[17]  P. Suarez,et al.  Impacts of flooding and climate change on urban transportation: A systemwide performance assessment of the Boston Metro Area , 2005 .

[18]  M. El-Raey,et al.  GIS ASSESSMENT OF THE VULNERABILITY OF THE ROSETTA AREA, EGYPT TO IMPACTS OF SEA RISE , 1997 .

[19]  Milliman Jd,et al.  Environmental and economic implications of rising sea level and subsiding deltas: the Nile and Bengal examples. , 1989 .

[20]  O. Frihy,et al.  Natural and anthropogenic influences in the northeastern coast of the Nile delta, Egypt , 2009 .

[21]  D. Stanley,et al.  Nile Delta: Recent Geological Evolution and Human Impact , 1993, Science.

[22]  Mohamed Sultan,et al.  Land subsidence in the Nile Delta: inferences from radar interferometry , 2009 .

[23]  D. Stanley.  Mediterranean deltas : subsidence as a major control of relative sea-level rise , 1997 .