English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

A reconstrucao paleoambiental das zonas humidas litorais portuguesas constitui um elemento fundamental para o conhecimento da historia evolutiva da zona costeira num passado geologico recente (Quaternario). Com a intencao de contribuir para o melhoramento do modelo de evolucao da varzea da Nazare (paleolaguna da Pederneira) durante o Plistocenico final e o Holocenico, procedeu-se a determinacao da geometria e volumetria das unidades constituintes do seu enchimento sedimentar, aplicando modelacao geologica tridimensional.Para esse efeito, utilizou-se a informacao disponivel, a qual permitiu definir tres unidades litoestratigraficas (fluvial basal, marinho/lagunar e fluvial recente) e aplicou-se um modelo geomorfologico concetual ao conhecimento geomorfologico/geologico da area de estudo, o qual se mostrou imprescindivel para ultrapassar a insuficiencia de dados de base e a sua distribuicao nao uniforme na area de estudo.Recorrendo a ferramentas de interpolacao espacial, foi definida a paleosuperficie de acomodacao do enchimento sedimentar plisto-holocenico, bem como as paleosuperficies que limitam as unidades constituintes daquele enchimento. Atraves de modelacao geologica tridimensional, foi possivel determinar a geometria e a volumetria total da paleolaguna da Pederneira bem como das unidades litoestratigraficas, e aferir a verosimilidade dos valores produzidos atraves do calculo da erosao media da superficie da bacia hidrografica, necessaria para a producao do volume determinado. Palavras-chave: Plisto-holocenico, Modelo geomorfologico, Modelacao geologica 3D, Reconstrucao paleoambiental, Sistemas de Informacao Geografica. Geological modeling of the Late Pleistocene-Holocene sedimentary infill of Pederneira paleolagoon The paleoenvironmental reconstruction of the Portuguese coastal wetlands is a key element for understanding the evolutionary history of the coastal zone in the recent geological past (Quaternary).Aiming to improve the evolutionary model of Nazare lowland (Pederneira paleolagoon) during the late Pleistocene and Holocene, a 3D geological modeling approach was used to define the geometry and volume of the main geological units of its sedimentary infill.With this purpose, three lithostratigraphic units were defined (basal fluvial, marine / lagoon and recent fluvial) and a simple conceptual geomorphological model was developed to overcome the scarcity of geological data and its non-uniform distribution across the study area.Using spatial interpolation tools in a GIS environment, the paleosurface that accommodate the Pleisto-Holocene sedimentary infill, as well the paleosurfaces that limit their constituent units, were defined. Through 3D geological modeling, it was possible to define the geometry and the total volume of the lithostratigraphic units, and evaluate the reasonableness of the estimated values through the comparison with watershed erosion estimates.The methodology used in the 3D modeling, produced satisfactory results, providing an effective tool in the problem of paleoenvironmental reconstruction in areas with scarce geologic information. Keywords: Pleisto-Holocene, Geomorphologic model, 3D Geologic modeling, Paleoenvironmental recon-struction, Geographic Information Systems.

Modelação geológica do enchimento sedimentar Plisto-Holocénico da paleolaguna da Pederneira