Sangam: A Confluence of Knowledge Streams

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

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dc.contributor Geosciences
dc.creator Gómez, Juan Felipe
dc.creator Kwoll, Eva
dc.creator Walker, Ian J.
dc.creator Shirzaei, Manoochehr
dc.date 2021-07-23T17:29:11Z
dc.date 2021-07-23T17:29:11Z
dc.date 2021-07-20
dc.date 2021-07-23T13:27:55Z
dc.date.accessioned 2023-03-01T18:54:05Z
dc.date.available 2023-03-01T18:54:05Z
dc.identifier Gómez, 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.
dc.identifier http://hdl.handle.net/10919/104380
dc.identifier https://doi.org/10.3390/geosciences11070300
dc.identifier.uri http://localhost:8080/xmlui/handle/CUHPOERS/281791
dc.description To 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.
dc.description Published version
dc.format application/pdf
dc.format application/pdf
dc.language en
dc.publisher MDPI
dc.rights Creative Commons Attribution 4.0 International
dc.rights http://creativecommons.org/licenses/by/4.0/
dc.subject sea-level rise
dc.subject InSAR
dc.subject Magdalena River
dc.subject coastal changes
dc.subject subsidence
dc.subject mangroves
dc.subject sediment compaction
dc.title Vertical Land Motion as a Driver of Coastline Changes on a Deltaic System in the Colombian Caribbean
dc.title Geosciences
dc.type Article - Refereed
dc.type Text


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