Discharge diversion in the Patía River delta, the Colombian Pacific: Geomorphic and ecological consequences for mangrove ecosystems

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dc.citation.journalTitleJournal Of South American Earth Sciences
dc.contributor.authorRestrepo, Juan D.spa
dc.contributor.authorCantera, Jaime R.spa
dc.contributor.departmentUniversidad EAFIT. Departamento de Geologíaspa
dc.contributor.researchgroupCiencias del Marspa
dc.date.accessioned2021-03-23T20:20:24Z
dc.date.available2021-03-23T20:20:24Z
dc.date.issued2013-10-01
dc.description.abstractIn the Patía River delta, the best-developed delta on the western margin of South America, a major water diversion started in 1972. The diversion of the Patía flow to the Sanquianga River, the latter a small stream draining internal lakes from the Pacific lowlands, shifted the active delta plain from the south to the north and changed the northern estuarine system into an active delta plain. The Sanquianga Mangrove National Park, a mangrove reserve measuring 800km2, lies in this former estuary, where major hydrologic and sedimentation changes are occurring. Overall, major environmental consequences of this discharge diversion in terms of geomorphic changes along distributary channels and ecological impacts on mangrove ecosystems are evidenced by: (1) distributary channel accretion by operating processes such as sedimentation, overbank flow, increasing width of levees, sedimentation in crevasses, interdistributary channel fill, and colonization of pioneer mangrove; (2) freshening conditions in the Sanquianga distributary channel, a hydrologic change that has shifted the upper estuarine region (salinity <1%) downstream; (3) downstream advance of freshwater vegetation, which is invading channel banks in the lower and mixing estuarine zones; (4) die-off of approximately 5200ha of mangrove near the delta apex at Bocas de Satinga, where the highest sediment accumulation rates occur; and (5) recurrent periods of mangrove defoliation due to a worm plague. Further analyses indicate strong mangrove erosion along transgressive barrier islands on the former delta plain. Here tectonic-induced subsidence, relative sea-level rise, and sediment starving conditions due to the channel diversion, are the main causes of the observed retreating conditions of mangrove communities. Our data also indicate that the Patía River has the highest sediment load (27×106tyr-1) and basin-wide sediment yield (1500tkm-2yr-1) on the west coast of South America. Erosion rates from the Patía catchment have been more pronounced during the decades of 1970-1980 and 1990-2000, as a result of land degradation and deforestation. The high sediment and freshwater inputs into the mangrove ecosystem create additional stress (both at ongoing background levels and, occasionally, at dramatic levels), which may periodically push local environmental parameters beyond the thresholds for mangrove survival. The future environmental state of the Sanquianga Mangrove National Reserve deserves more scientific and governmental attention. © 2011 Elsevier Ltd.eng
dc.identifierhttps://eafit.fundanetsuite.com/Publicaciones/ProdCientif/PublicacionFrw.aspx?id=1558
dc.identifier.doi10.1016/j.jsames.2011.04.006
dc.identifier.issn08959811
dc.identifier.issn18730647
dc.identifier.otherWOS;000324455500016
dc.identifier.otherSCOPUS;2-s2.0-84882902129
dc.identifier.urihttp://hdl.handle.net/10784/26887
dc.language.isoengeng
dc.publisherPERGAMON-ELSEVIER SCIENCE LTD
dc.relation.urihttps://www.scopus.com/inward/record.uri?eid=2-s2.0-84882902129&doi=10.1016%2fj.jsames.2011.04.006&partnerID=40&md5=026d9c63cd6aaa870e91f1098acd9718
dc.rightshttps://v2.sherpa.ac.uk/id/publication/issn/0895-9811
dc.sourceJournal Of South American Earth Sciences
dc.subject.keywordcoastal erosioneng
dc.subject.keyworddeltaeng
dc.subject.keywordenvironmental effecteng
dc.subject.keywordenvironmental stresseng
dc.subject.keywordestuaryeng
dc.subject.keywordmangroveeng
dc.subject.keywordriver dischargeeng
dc.subject.keywordsediment yieldeng
dc.subject.keywordColombiaeng
dc.subject.keywordPacific Coast [Colombia]eng
dc.subject.keywordPacific Coast [South America]eng
dc.subject.keywordPatia Rivereng
dc.titleDischarge diversion in the Patía River delta, the Colombian Pacific: Geomorphic and ecological consequences for mangrove ecosystemseng
dc.typeinfo:eu-repo/semantics/articleeng
dc.typearticleeng
dc.typeinfo:eu-repo/semantics/publishedVersioneng
dc.typepublishedVersioneng
dc.type.localArtículospa

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