Vertical ground motion and historical sea-level records in Dakar (Senegal). Cozannet, G. L., Raucoules, D., Wöppelmann, G., Garcin, M., Sylva, S. D., Meyssignac, B., Gravelle, M., & Lavigne, F. 10(8):084016. Number: 8![Vertical ground motion and historical sea-level records in Dakar (Senegal) [link]](https://bibbase.org/img/filetypes/link.svg "link")
Paper doi abstract bibtex With growing concerns regarding future impacts of sea-level in major coastal cities, the most accurate information is required regarding local sea-level changes with respect to the coast. Besides global and regional sea-level changes, local coastal vertical ground motions can substantially contribute to local changes in sea-level. In some cases, such ground motions can also limit the usefulness of tide-gauge records, which are a unique source of information to evaluate global sea-level changes before the altimetry era. Using satellite synthetic aperture radar interferometry, this study aims at characterizing vertical coastal ground motion in Dakar (Senegal), where a unique century-long record in Africa has been rediscovered. Given the limited number of available images, we use a stacking procedure to compute ground motion velocities in the line of sight over 1992–2010. Despite a complex geology and a rapid population growth and development, we show that the city as a whole is unaffected by differential ground motions larger than 1 mm year−1. Only the northern part of the harbor displays subsidence patterns after 2000, probably as a consequence of land reclamation works. However, these ground motions do not affect the historical tide gauge. Our results highlight the value of the historical sea-level records of Dakar, which cover a 100 year time-span in a tropical oceanic region of Africa, where little data are available for past sea-level reconstructions.
@article{cozannet_vertical_2015,
title = {Vertical ground motion and historical sea-level records in Dakar (Senegal)},
volume = {10},
issn = {1748-9326},
url = {https://doi.org/10.1088%2F1748-9326%2F10%2F8%2F084016},
doi = {10.1088/1748-9326/10/8/084016},
abstract = {With growing concerns regarding future impacts of sea-level in major coastal cities, the most accurate information is required regarding local sea-level changes with respect to the coast. Besides global and regional sea-level changes, local coastal vertical ground motions can substantially contribute to local changes in sea-level. In some cases, such ground motions can also limit the usefulness of tide-gauge records, which are a unique source of information to evaluate global sea-level changes before the altimetry era. Using satellite synthetic aperture radar interferometry, this study aims at characterizing vertical coastal ground motion in Dakar (Senegal), where a unique century-long record in Africa has been rediscovered. Given the limited number of available images, we use a stacking procedure to compute ground motion velocities in the line of sight over 1992–2010. Despite a complex geology and a rapid population growth and development, we show that the city as a whole is unaffected by differential ground motions larger than 1 mm year−1. Only the northern part of the harbor displays subsidence patterns after 2000, probably as a consequence of land reclamation works. However, these ground motions do not affect the historical tide gauge. Our results highlight the value of the historical sea-level records of Dakar, which cover a 100 year time-span in a tropical oceanic region of Africa, where little data are available for past sea-level reconstructions.},
pages = {084016},
number = {8},
journaltitle = {Environmental Research Letters},
shortjournal = {Environ. Res. Lett.},
author = {Cozannet, Gonéri Le and Raucoules, Daniel and Wöppelmann, Guy and Garcin, Manuel and Sylva, Sylvestre Da and Meyssignac, Benoit and Gravelle, Médéric and Lavigne, Franck},
urldate = {2019-04-17},
date = {2015-08},
langid = {english},
note = {Number: 8}
}
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