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Impact of outflow from the Guadiana River on the distribution of suspended particulate matter and nutrients in the adjacent coastal zone

2006Journal article Restricted access
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dc.contributor.authorCravo, Alexandra
dc.contributor.authorMadureira, Pedro Miguel
dc.contributor.authorFelícia, Helena
dc.contributor.authorRita, F.
dc.contributor.authorBebianno, Maria
dc.date.accessioned2020-05-11T13:45:09Z
dc.date.available2020-05-11T13:45:09Z
dc.date.issued2006
dc.description.abstractIn this study we collected surface water samples from the coastal area adjacent to the Guadiana estuary during winter for 3 consecutive years to assess the impact of the Guadiana outflow upon the concentration and spatial distribution of suspended particulate matter and nutrients (nitrate, phosphate, and silicate). Deeper water samples were also collected near the river mouth in water greater than 10 m in depth. Our results indicate that the maximal surface influence of the Guadiana outflow is close to the mouth of the Guadiana River, at the 10-m isobath, where the highest concentrations of suspended particulate matter (SPM) and nutrients were recorded, as well as the lowest salinity. SPM and nutrient concentrations decrease with increased water depth, while salinity increased. Beyond the 10-m isobath, toward the ocean, nutrient concentrations decreased gradually with increasing salinity. Nutrient concentrations showed a conservative behaviour only during the last of the three sampling periods. The impact of Guadiana outflow was especially low when river discharge was low, however, after periods of peak rainfall the river outflow increased enormously and the impact of SPM and nutrients (more than an order of magnitude higher than normal) was observed, particularly around the mouth of the estuary. This impact involved the development of a fingerprint plume that represents a net export of SPM and nutrients to the coastal area. This plume had a width of about 10e15 km, and despite being centred slightly east of the mouth of the Guadiana River, tended to migrate westward. The increase in N compounds was more significant than increases in P and Si, is reflected in high N:P and N:Si nutrient ratios. In water depths in excess of 10 m, the effect of the Guadiana outflow was most evident until 5 m depth. It is expected that with the completion of the biggest dam in Europe along the Guadiana River, the outflow of the river will be markedly reduced, especially during summer if climatic change continues to produce significant periods of dry weather. Under such conditions, nutrient concentrations will be reduced even further and impart a negative impact on nutrient biogeochemical cycles and productivity of the coastal zone.pt_PT
dc.description.sponsorshipProject SIRIA funded by a joint venture between the Ministry of Defence and the Foundation of the Portuguese Universities under the Framework of the ‘‘Environment and Defence Programme’’pt_PT
dc.description.versioninfo:eu-repo/semantics/publishedVersionpt_PT
dc.identifier.doi10.1016/j.ecss.2006.05.034pt_PT
dc.identifier.issn0272-7714
dc.identifier.urihttp://hdl.handle.net/10400.1/13872
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.publisherElsevierpt_PT
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/pt_PT
dc.subjectNutrientspt_PT
dc.subjectGuadiana Riverpt_PT
dc.subjectCoastal waterspt_PT
dc.subjectAlqueva Dampt_PT
dc.subjectEstuarypt_PT
dc.subjectCatchmentspt_PT
dc.titleImpact of outflow from the Guadiana River on the distribution of suspended particulate matter and nutrients in the adjacent coastal zonept_PT
dc.typejournal article
dspace.entity.typePublication
oaire.citation.endPage75pt_PT
oaire.citation.issue1-2pt_PT
oaire.citation.startPage63pt_PT
oaire.citation.titleEstuarine, Coastal and Shelf Sciencept_PT
oaire.citation.volume70pt_PT
person.familyNameCravo
person.familyNameMadureira
person.familyNameBebianno
person.givenNameAlexandra
person.givenNamePedro Miguel
person.givenNameMaria
person.identifier.ciencia-id7419-EE20-8039
person.identifier.ciencia-idBD11-66D7-5BC3
person.identifier.ciencia-id2B11-46AC-B94B
person.identifier.orcid0000-0002-2569-3929
person.identifier.orcid0000-0003-4762-6273
person.identifier.orcid0000-0003-1492-8566
person.identifier.scopus-author-id24503642500
person.identifier.scopus-author-id7004152715
rcaap.rightsrestrictedAccesspt_PT
rcaap.typearticlept_PT
relation.isAuthorOfPublicationf19c20c8-9654-43db-841b-2c6f14979df5
relation.isAuthorOfPublication88239666-0934-4a0d-881d-26ba1bda5e95
relation.isAuthorOfPublication2e00a26d-1dd3-4c22-a6bf-ac7943ae0d32
relation.isAuthorOfPublication.latestForDiscovery2e00a26d-1dd3-4c22-a6bf-ac7943ae0d32

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