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Downwearing rates on shore platforms of different calcareous lithotypes

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dc.contributor.authorMoura, D.
dc.contributor.authorGabriel, S.
dc.contributor.authorRamos-Pereira, A.
dc.contributor.authorNeves, M.
dc.contributor.authorTrindade, J.
dc.contributor.authorViegas, J.
dc.contributor.authorVeiga-Pires, C.
dc.contributor.authorFerreira, Ó.
dc.contributor.authorMatias, A.
dc.contributor.authorJacob, J.
dc.contributor.authorBoski, T.
dc.contributor.authorSantana, P.
dc.date.accessioned2019-01-24T14:43:06Z
dc.date.available2019-01-24T14:43:06Z
dc.date.issued2011
dc.description.abstractVertical lowering (downwearing) of shore platform surfaces is a very important mechanism in their morphological evolution albeit much remains incompletely understood. The efficacy of mechanical and chemical weathering acting on a given substrate, together with erosional processes, influences downwearing rates. In order to determine the relationship between lithotypes and downwearing rates, data collected from a Transverse Micro-erosion Meter were obtained for shore platforms of three different calcareous lithotypes (biocalcarenite, calcarenite and carbonated siltstone) along the central Algarve coast (Southern Portugal). Downwearing rates ranged between 0.096 mm year−1 and 1.676 mm year−1 in biocalcarenite and weakly cemented calcarenite, respectively. In addition, physical properties of the rocks comprising the platforms were measured, including uniaxial compressive strength (as determined by the Point Load Test), porosity, and calcium carbonate content. The results show that downwearing depends primarily on the intrinsic properties of the substrate. Porosity, in particular, acts in two ways: (i) it tends to weaken the substrate; and, (ii) it controls the downward extent of the water percolation and therefore the depth of the weathering mantle subject to erosion by waves and currents.pt_PT
dc.description.versioninfo:eu-repo/semantics/publishedVersionpt_PT
dc.identifier.citationMoura, D., Gabriel, S., Ramos-Pereira, A., Neves, M., Trindade, J., Viegas, J., Veiga-Pires, C., Ferreira, Ó., Matias, A., Jacob, J., Boski, T., & Santana, P. (2011). Downwearing rates on shore platforms of different calcareous lithotypes, Marine Geology, 286(1–4), 112-116. https://doi.org/10.1016/j.margeo.2011.06.002. ISSN 0025-3227
dc.identifier.doi10.1016/j.margeo.2011.06.002pt_PT
dc.identifier.urihttp://hdl.handle.net/10451/36672
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.publisherElsevierpt_PT
dc.relationProjects PTDC/CTEGEX/ 70448/2006 (BISHOP)pt_PT
dc.subjectRocky coastpt_PT
dc.subjectShore platformpt_PT
dc.subjectCalcareous rockpt_PT
dc.subjectDownwearingpt_PT
dc.titleDownwearing rates on shore platforms of different calcareous lithotypespt_PT
dc.typejournal article
dspace.entity.typePublication
oaire.citation.endPage116pt_PT
oaire.citation.issue1-4pt_PT
oaire.citation.startPage112pt_PT
oaire.citation.volume286pt_PT
person.familyNameTrindade
person.givenNameJorge
person.identifier.ciencia-id1411-A43D-9266
person.identifier.orcid0000-0001-5610-5942
person.identifier.ridM-9060-2013
person.identifier.scopus-author-id7003458343
rcaap.rightsrestrictedAccesspt_PT
rcaap.typearticlept_PT
relation.isAuthorOfPublication684b8bc6-777f-447e-aa0b-6c08bcce6184
relation.isAuthorOfPublication.latestForDiscovery684b8bc6-777f-447e-aa0b-6c08bcce6184

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