Istituto di Scienze Marine     
Rizzetto F., Tosi L. Aptitude of modern salt marshes to counteract relative sea-level rise, Venice Lagoon (Italy). In: Geology, vol. 39 (8) pp. 755 - 758. Geological Society of America, 2011.
This study points out the response of a part of the Venice lagoon tidal flats to sea-level changes in the past 70 yr. In the past century, in contrast with the general erosional trend, some salt marshes in the northern lagoon preserved their main original characteristics and showed accretion and development of the tidal creek network. The evolution of one of them, considered as an example of intertidal accretionary landform that responded rapidly to sea-level variations, was sketched by the interpretation of ultrahigh-resolution aerial photographs taken from A.D. 1938 to 2006, and the results were compared with relative sea-level rise trend and high tide frequency. The long-term investigation pointed out the most significant morphological changes that occurred over the entire period, whereas the short-term analysis showed in detail the subsequent phases of salt marsh evolution and their relations with sea-level variations. Even if in the past 70 yr the salt marsh underwent low accretion rates, it did not disappear, probably because the remobilization of sediments eroded from the marsh front and the lagoon bottom by tides and other local hydrodynamic processes and their accumulation on the marsh surface favored by vegetation were sufficient to offset sea-level rise.
DOI: 10.1130/G31736.1
Subject Salt marshes
Salt marshes

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