%0 Journal Article %T Vertical ground motion and historical sea-level records in Dakar (Senegal) Vertical ground motion and historical sea-level records in Dakar (Senegal) %+ Bureau de Recherches Géologiques et Minières (BRGM) (BRGM) %+ Laboratoire de géographie physique : Environnements Quaternaires et Actuels (LGP) %+ LIttoral ENvironnement et Sociétés (LIENSs) %+ Laboratoire d'études en Géophysique et océanographie spatiales (LEGOS) %A Le Cozannet, Gonéri %A Raucoules, Daniel %A Wöppelmann, Guy %A Garcin, Manuel %A da Sylva, Sylvestre %A Meyssignac, Benoit %A Gravelle, Médéric %A Lavigne, Franck %Z Projet BRGM EVARISTE %< avec comité de lecture %@ 1748-9326 %J Environmental Research Letters %I IOP Publishing %V 10 %P 084016 (11 p.) %8 2015 %D 2015 %R 10.1088/1748-9326/10/8/084016 %K sea-level rise %K tide gauges %K vertical ground motions %K geodetic instruments %K Dakar %K African coasts %Z Sciences of the Universe [physics]/Earth Sciences %Z Sciences of the Universe [physics]/Earth Sciences/GeomorphologyJournal articles %X 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. %G English %2 https://brgm.hal.science/hal-01186059/document %2 https://brgm.hal.science/hal-01186059/file/Le_Cozannet_et_al_2015_ERL_Dakar.pdf %L hal-01186059 %U https://brgm.hal.science/hal-01186059 %~ IRD %~ INSU %~ METEO %~ UNIV-PARIS1 %~ BRGM %~ UNIV-TLSE3 %~ CNRS %~ CNES %~ OMP %~ OMP-LEGOS %~ GIP-BE %~ UPEC %~ LGP %~ UNIV-ROCHELLE %~ CONDORCET3 %~ CAMPUS-CONDORCET %~ UNIV-UT3 %~ UT3-INP %~ UT3-TOULOUSEINP