Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

Evaluation and Modelling of the Coastal Geomorphological Changes of Deception Island Since 1970 Eruption and Its Involvement in Research Activity

Cristina Torrecillas
* ORCID logo ,
Carmen Zarzuelo
ORCID logo ,
Jorge de la Fuente
,
Bismarck Jigena-Antelo
ORCID logo ,
Gonçalo Prates
ORCID logo
Version 1 : Received: 6 November 2023 / Approved: 7 November 2023 / Online: 7 November 2023 (13:24:52 CET)

A peer-reviewed article of this Preprint also exists.

Torrecillas, C.; Zarzuelo, C.; de la Fuente, J.; Jigena-Antelo, B.; Prates, G. Evaluation and Modelling of the Coastal Geomorphological Changes of Deception Island since the 1970 Eruption and Its Involvement in Research Activity. Remote Sens. 2024, 16, 512. Torrecillas, C.; Zarzuelo, C.; de la Fuente, J.; Jigena-Antelo, B.; Prates, G. Evaluation and Modelling of the Coastal Geomorphological Changes of Deception Island since the 1970 Eruption and Its Involvement in Research Activity. Remote Sens. 2024, 16, 512.

Abstract

Deception Island is an active volcano with a submerged caldera open to the sea, giving it a horseshoe-shaped structure. Several post-caldera-collapsed volcanic events, as well as hydrodynamics within this natural bay, have modified its inner coastline, shaping new tephra deposits and altering the landscape. A hydrodynamic model is presented to predict accretion and erosion trends on the coast, which impact the mobility of researchers and tourists, whether on foot or by boat. Historical orthophoto images and spatiotemporal differences in digital elevation and bathymetric models have been used for validation purposes. The model reveals that the south-facing coast is more susceptible to erosion, while the east-west-facing coast experiences sedimentation. However, a visual study of the coastline has indicated erosion ratios in cliff areas in sedimentary zones. This is likely due to the erosive effect caused by ice floe fragments accumulating in these areas due to wave action. Only a portion of the significant total loss of surface material is received within the bay, including its own erosion, and accumulates on the bay's floor. This is partially due to the volume being composed of snow, and there is also a transfer of material to the exterior to balance the figures.

Keywords

hydrodynamic model; coastal changes; DELFT3D; erosion and sedimentation rates

Subject

Environmental and Earth Sciences, Remote Sensing

Copyright: This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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