Vertical Land Motion as a Driver of Coastline Changes on a Deltaic System in the Colombian Caribbean

dc.contributor.authorGómez, Juan Felipeen
dc.contributor.authorKwoll, Evaen
dc.contributor.authorWalker, Ian J.en
dc.contributor.authorShirzaei, Manoochehren
dc.contributor.departmentGeosciencesen
dc.date.accessioned2021-07-23T17:29:11Zen
dc.date.available2021-07-23T17:29:11Zen
dc.date.issued2021-07-20en
dc.date.updated2021-07-23T13:27:55Zen
dc.description.abstractTo face and properly mitigate coastal changes at a local level, it is necessary to recognize and characterize the specific processes affecting a coastline. Some of these processes are local (e.g., sediment starvation), while others are regional (e.g., relative sea-level change) or global (e.g., eustatic sea-level rise). Long tide gauge records help establish sea-level trends for a region that accounts for global (eustatic, steric) and regional (isostatic) sea-level changes. Local sea-level changes are also the product of vertical land motion (VLM), varying depending on tectonic, sedimentological, and anthropogenic factors. We investigate the role of coastal land subsidence in the present-day dynamics of an abandoned delta in the Colombian Caribbean. Satellite images and synthetic aperture radar acquisitions are used to assess decadal-scale coastline changes and subsidence rates for the period 2007–2021. We found that subsidence rates are highly variable alongshore. Local subsidence rates of up to −1.0 cm/yr correspond with an area of erosion rates of up to −15 m/yr, but coastal erosion also occurs in sectors where subsidence was not detected. The results highlight that local coastline changes are influenced by multiple, interacting drivers, including sand supply, coastline orientation and engineering structures, and that subsidence alone does not explain the high rates of coastal erosion along the study area. By the end of the century, ongoing coastal erosion rates of up to −25 m/yr, annual rates of subsidence of about −1 cm/yr, and current trends of global sea-level rise are expected to increase flooding levels and jeopardize the existence of the deltaic barrier island.en
dc.description.versionPublished versionen
dc.format.mimetypeapplication/pdfen
dc.identifier.citationGómez, J.F.; Kwoll, E.; Walker, I.J.; Shirzaei, M. Vertical Land Motion as a Driver of Coastline Changes on a Deltaic System in the Colombian Caribbean. Geosciences 2021, 11, 300.en
dc.identifier.doihttps://doi.org/10.3390/geosciences11070300en
dc.identifier.urihttp://hdl.handle.net/10919/104380en
dc.language.isoenen
dc.publisherMDPIen
dc.rightsCreative Commons Attribution 4.0 Internationalen
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/en
dc.subjectsea-level riseen
dc.subjectInSARen
dc.subjectMagdalena Riveren
dc.subjectcoastal changesen
dc.subjectsubsidenceen
dc.subjectmangrovesen
dc.subjectsediment compactionen
dc.titleVertical Land Motion as a Driver of Coastline Changes on a Deltaic System in the Colombian Caribbeanen
dc.title.serialGeosciencesen
dc.typeArticle - Refereeden
dc.type.dcmitypeTexten

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