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Is land subsidence increasing the exposure to sea level rise in Alexandria, Egypt?

Abstract : Delta 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/year on average and up to 2 mm/year locally). This contrasts to previous studies that suggested subsidence in excess of 3 mm/year. 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 inter-seismic 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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Soumis le : dimanche 24 novembre 2013 - 07:00:18
Dernière modification le : vendredi 5 août 2022 - 09:28:33
Archivage à long terme le : : mardi 25 février 2014 - 02:25:21


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Guy Woppelmann, Gonéri Le Cozannet, Marcello de Michele, Daniel Raucoules, Anny Cazenave, et al.. Is land subsidence increasing the exposure to sea level rise in Alexandria, Egypt?. Geophysical Research Letters, American Geophysical Union, 2013, 40 (12), pp.2953-2957. ⟨10.1002/grl.50568⟩. ⟨hal-00825699⟩



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