Your browser doesn't support javascript.
loading
Geophysical investigations unravel the vestiges of ancient meandering channels and their dynamics in tidal landscapes.
Boaga, Jacopo; Ghinassi, Massimiliano; D'Alpaos, Andrea; Deidda, G P; Rodriguez, G; Cassiani, Giorgio.
Afiliação
  • Boaga J; Dipartimento di Geoscienze, Università di Padova, Padua, Italy.
  • Ghinassi M; Dipartimento di Geoscienze, Università di Padova, Padua, Italy.
  • D'Alpaos A; Dipartimento di Geoscienze, Università di Padova, Padua, Italy.
  • Deidda GP; Dipartimento di Ingegneria Civile, Ambientale e Architettura, Università di Cagliari, Cagliari, Italy.
  • Rodriguez G; Dipartimento di Matematica e Informatica, Università di Cagliari, Cagliari, Italy.
  • Cassiani G; Dipartimento di Geoscienze, Università di Padova, Padua, Italy. giorgio.cassiani@unipd.it.
Sci Rep ; 8(1): 1708, 2018 01 26.
Article em En | MEDLINE | ID: mdl-29374215
ABSTRACT
Whether or not one can detect relict signatures of the past imprinted in current landscapes is a question of the utmost theoretical and practical relevance for meandering tidal channels, owing to their influence on the morphodynamic evolution of tidal landscapes, a critically fragile environment, especially in face of expected climatic changes. Unravelling the sedimentary patterns of ancient channels is an expensive process that usually requires high resolution sediment coring. Here we use a novel inversion process of multi-frequency electromagnetic measurements to reveal the signature and characterize the dynamics of a salt-marsh paleo-meander in the Venice Lagoon. We show that the ancient meander migrated laterally while vertically aggrading, developing a peculiar bar geometry which is less common in analogous fluvial meanders. The observed point-bar dynamics and the associated architectural geometry are consistent with remote sensing and borehole data and contrast with current assessments of tidal meander morphodynamics mediated from classical fluvial theories. In addition, the proposed technique, rapid and non-invasive, bears important consequences for detecting buried stratal geometries and reconstructing the spatial distribution of ancient sedimentary bodies, providing quantitative data for the description of landscape evolution in time.

Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Idioma: En Ano de publicação: 2018 Tipo de documento: Article

Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Idioma: En Ano de publicação: 2018 Tipo de documento: Article