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Título

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

AutorWöppelmann, Guy; Le Cozannet, Gonéri; De Michele, Marcello; Raucoules, Daniel; Cazenave, Anny; Garcin, Manuel; Hanson, Susan; Marcos, Marta ; Santamaría-Gómez, Álvaro
Palabras claveAlexandria
Coastal subsidence
GPS
InSAR
Sea level
tide gauge
Fecha de publicación18-jun-2013
EditorAmerican Geophysical Union
CitaciónGeophysical Research Letteres 40(12): 2953-2957 (2013)
ResumenDelta 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. Key Points Use of a combined analysis of GPS and PSI data Alexandria coastal are has been subject to moderate land subsidence Important considerations for local planning and policy development ©2013. American Geophysical Union. All Rights Reserved.
Versión del editorhttp://dx.doi.org/10.1002/grl.50568
URIhttp://hdl.handle.net/10261/126698
DOI10.1002/grl.50568
Identificadoresdoi: 10.1002/grl.50568
issn: 0094-8276
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