Reconstructing past sea level through notches: Orosei Gulf

Nikos Georgiou, Paolo Stocchi, Alessio Rovere, Elisa Casella

Abstract

A tidal notch with a maximum height of 10.5 m and almost 60 km of lateral extent was carved during the Last Interglacial (127-116 ka BP) along the West-Sardinian coast, in the Orosei Gulf. We present the results of the detailed mapping of the Orosei tidal notch using the Structure from Motion Multi-View Stereo (SfM-MVS) reconstruction method. Although its geometry is laterally constant, the notch depth differs due to local factors. Results of SfM-MVS reconstructions, together with local parameters, were used as input in a geometric model that simulates the notch shape based on randomly sampled relative sea-level curves. The modeled profiles best matching with the real shape of the notch are those characterized by a bimodal geometry. Extracting information from this rocky imprint is considered crucial to better understand past changes in sea level, which are in turn significant to better gauge sea-level variations in warmer climate conditions.

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IMEKO-TC19-MetroSea-2020-35.pdf

DOI

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IMEKO TC

TC19 - Environmental Measurements

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