Abstract
AbstractDelta margins are subject to relatively high rates of land subsidence and have the potential to significantly exacerbate future changes in sea levels predicted by global warming models used in impact studies. Through a combined analysis of GPS and persistent scatterer interferometry data, we determine that most of the coastline of Alexandria has been subject to moderate land subsidence over the past decade (0.4 mm/yr on average and up to 2 mm/yr locally). This contrasts to previous studies that suggested subsidence in excess of 3 mm/yr. Based on our findings, we infer that on multi‐century to millennia timescales, land subsidence in the area of Alexandria is dominated by tectonic setting and earthquakes or gravitational collapse episodes of a growth fault, whereas on shorter interseismic decadal to century timescales, subsidence rates are likely steady and moderate, in agreement with natural compaction and dewatering of the observed Holocene sediment layer.
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References
26
[10]
Intergovernmental Oceanographic Commission(2012) Global Sea Level Observing System (GLOSS): Implementation plan 2012 Intergov. Oceanogr. Comm. Tech. Ser. 100 Paris.
[15]
Research Institute for Groundwater(1992) Nile Delta. Hydrogeological map of Egypt. Minist. of Publ. Works and Water Resour. Cairo.
[19]
Stanley D. J. "Mediterranean deltas: Subsidence as a major control of relative sea‐level rise" Bull. Institut. Océanogr. Monaco (1997)
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Stanley J.‐D. "Human impact on sediment mass movement and submergence of ancient sites in the two harbours of Alexandria, Egypt" Norw. J. Geol. (2006)
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65
Citations
26
References
Details
Published
Jun 18, 2013
Vol/Issue
40(12)
Pages
2953-2957
License
View
Funding
French Research National Agency (ANR) Award: ANR-09-CEP-001-01
Cite This Article
Guy Wöppelmann, Gonéri Le Cozannet, Marcello de Michele, et al. (2013). Is land subsidence increasing the exposure to sea level rise in Alexandria, Egypt?. Geophysical Research Letters, 40(12), 2953-2957. https://doi.org/10.1002/grl.50568
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