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Downwearing rates on shore platforms of different calcareous lithotypes

2011Journal article Restricted access
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dc.contributor.authorMoura, Delminda
dc.contributor.authorGabriel, Selma
dc.contributor.authorRamos-Pereira, Ana
dc.contributor.authorNeves, Mário
dc.contributor.authorTrindade, Jorge
dc.contributor.authorViegas, José
dc.contributor.authorVeiga-Pires, C.
dc.contributor.authorFerreira, Óscar
dc.contributor.authorMatias, Ana
dc.contributor.authorJacob, J.
dc.contributor.authorBoski, T.
dc.contributor.authorSantana, Paulo
dc.date.accessioned2013-03-26T15:04:00Z
dc.date.available2013-03-26T15:04:00Z
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.por
dc.description.sponsorshipPortuguese Foundation for Science and Technology (FCT) through Research Projects PTDC/CTEGEX/70448/2006 (BISHOP) and PTDC/CTE-GIX/111230/2009 (EROS).por
dc.identifier.doihttp://dx.doi.org/10.1016/j.margeo.2011.06.002
dc.identifier.otherAUT: DMO00293; JJA00032; OFE00989; JVI00806
dc.identifier.urihttp://hdl.handle.net/10400.1/2637
dc.language.isoengpor
dc.peerreviewedyespor
dc.publisherElsevierpor
dc.subjectRocky coastpor
dc.subjectShore platformpor
dc.subjectCalcareous rockpor
dc.subjectDownwearingpor
dc.titleDownwearing rates on shore platforms of different calcareous lithotypespor
dc.typejournal article
dspace.entity.typePublication
oaire.citation.endPage116por
oaire.citation.startPage112por
oaire.citation.titleMarine Geologypor
oaire.citation.volume286por
person.familyNameMoura
person.familyNameViegas
person.familyNameVeiga-Pires
person.familyNameFerreira
person.familyNameMatias
person.familyNameJacob
person.familyNameBoski
person.givenNameDelminda
person.givenNameJosé
person.givenNameCristina
person.givenNameÓscar
person.givenNameAna
person.givenNameJosé
person.givenNameTomasz
person.identifierR-001-Y1T
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person.identifier.orcid0000-0001-9718-7470
person.identifier.orcid0000-0003-2462-4179
person.identifier.ridC-4037-2018
person.identifier.ridB-5144-2008
person.identifier.ridE-9709-2013
person.identifier.scopus-author-id15048413000
person.identifier.scopus-author-id49964844000
person.identifier.scopus-author-id7801372905
person.identifier.scopus-author-id56260567900
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person.identifier.scopus-author-id6602267486
rcaap.rightsrestrictedAccesspor
rcaap.typearticlepor
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