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Late Holocene natural and man induced environmental changes in the Western Iberian coast: acessing forcing factors

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dc.contributor.authorRamos Pereira, A.
dc.contributor.authorRamos, Catarina
dc.contributor.authorDanielsen, Randi
dc.contributor.authorTrindade, J.
dc.contributor.authorSoares, António M. S.
dc.contributor.authorGranja, Helena
dc.contributor.authorMartins, José M.M.
dc.contributor.authorPortela, Paulo J.C.
dc.contributor.authorTorres, André
dc.contributor.authorAraújo-Gomes, João
dc.date.accessioned2020-06-12T15:09:16Z
dc.date.available2020-06-12T15:09:16Z
dc.date.issued2019
dc.description.abstractThe Western coast of the Iberian Peninsula stands as an interface between both the Atlantic and Mediterranean climatic influences and marine / fluvial conditions. The paper aims to assess the environmental changes in the last ca 6000 years (both natural and anthropogenic induced) using multiproxy analysis (geomorphological and sedimentological data, elemental and stable isotope content, microfossil assemblages, radiocarbon dating, and historical records) applied to an embayed coast. The results showed the prevalence of marine environment until 6272-6000 cal BP, but with fluvial infilling of the inner embayment, even before present sea level was reached (ca 4500-4000 cal BP). The influx of sediments was probably the result of the four recorded wet episodes (at modelled age cal BP (2σ): E1 – 6067-4770, E2 – 5806-4409, E3 – 5383-4088, and E4 – 4086-3905). These great sediment influxes along the previous 3000 years continues until 2110-1962 cal BP triggering the downstream migration of the river mouth, the development of a sand barrier coast and of a sheltered lagoon inside the palaeo-embayment. Afterwards the sedimentation rate (SR) reached high values (0.19-0.48 cmyr-1), as the result of Roman intervention in the drainage basin where pastures and local fires are recorded, together with an increasing dryness. A major disturbance is recorded in the Pollen Assemblages Zones (between PAZ II and PAZ III) and in the sediments around 1863-1706 cal BP (2σ), in the transition from the Roman Age to the Muslim invasion period, probably reflecting a hiatus in the sedimentary record. Onwards, SR reached 0.21-0.57 cmyr-1. Two major hydro marine episodes may have contributed to this fact: the latter is the Lisbon tsunami (1755 AD) while the former may reflect the 16th Century tsunamis or a great marine storm episode. An aeolian environment prevailed since then and the embayment was transformed into a dune field interrupted only by the narrow channel of the river whose mouth is often closed.pt_PT
dc.description.versioninfo:eu-repo/semantics/publishedVersionpt_PT
dc.identifier.citationRamos-Pereira, Ana, et al. (2019). Late Holocene natural and man induced environmental changes in the Western Iberian coast: acessing forcing factors. In: Água e Território: um tributo a Catarina Ramos (pp. 217-250). Centro de Estudos Geográficos, IGOT, Universidade de Lisboa. ISBN: 978-972-636-280-1pt_PT
dc.identifier.isbn978-972-636-280-1
dc.identifier.urihttp://hdl.handle.net/10451/43801
dc.language.isoengpt_PT
dc.publisherUniversidade de Lisboa, Centro de Estudos Geográficospt_PT
dc.subjectFluvio-marine interactionspt_PT
dc.subjectTsunamipt_PT
dc.subjectHolocene climatic fluctuationspt_PT
dc.subjectAnthropogenic interventionpt_PT
dc.subjectBayesian analysispt_PT
dc.subjectVicia fabapt_PT
dc.subjectPortugalpt_PT
dc.titleLate Holocene natural and man induced environmental changes in the Western Iberian coast: acessing forcing factorspt_PT
dc.typebook part
dspace.entity.typePublication
oaire.citation.endPage250pt_PT
oaire.citation.startPage217pt_PT
oaire.citation.titleÁgua e Territóriopt_PT
person.familyNameRamos-Pereira
person.familyNameTrindade
person.givenNameAna
person.givenNameJorge
person.identifier.ciencia-id6119-3592-BFFF
person.identifier.ciencia-id1411-A43D-9266
person.identifier.orcid0000-0002-2211-1321
person.identifier.orcid0000-0001-5610-5942
person.identifier.ridM-9060-2013
person.identifier.scopus-author-id7801332417
person.identifier.scopus-author-id7003458343
rcaap.rightsopenAccesspt_PT
rcaap.typebookPartpt_PT
relation.isAuthorOfPublication6f637eb5-95ad-4164-b68e-0773e235a687
relation.isAuthorOfPublication684b8bc6-777f-447e-aa0b-6c08bcce6184
relation.isAuthorOfPublication.latestForDiscovery6f637eb5-95ad-4164-b68e-0773e235a687

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