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Article Dans Une Revue PLoS ONE Année : 2024

Quantifying the topographical structure of rocky and coral seabeds

Résumé

Describing the structural complexity of seabeds is of primary importance for a number of geomorphological, hydrodynamical and ecological issues. Aiming to bring a decisive insight on the long-term development of a unified view, the present study reports on a comparative multi-site analysis of high resolution topography surveys in rough nearshore environments. The nine study sites have been selected to cover a wide variety of topographical features, including rocky and coral seabeds. The topography data has been processed to separate roughness and bathymetry-related terrain features, allowing to perform a comprehensive spectral and statistical analysis of each site. A series of roughness metrics have been tested to identify the most relevant estimators of the bottom roughness at each site. The spectral analysis highlights the systematic presence of a self-affine range of variable extension and spectral slope. The standard deviation of the seabed elevation varies from 0.04 to 0.77 m. The statistical and multi-scale analysis performed on the whole set of roughness metrics allows to identify connection between metrics and therefore to propose a reduced set of relevant roughness estimators. A more general emphasis is placed on the need to properly define a unified framework when reconstructing roughness statistics and bathymetry from fine seabed topographical data.
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hal-04604525 , version 1 (07-06-2024)

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Damien Sous, Samuel Meulé, Solène Dealbera, Héloïse Michaud, Ghislain Gassier, et al.. Quantifying the topographical structure of rocky and coral seabeds. PLoS ONE, 2024, 19 (6), pp.e0303422. ⟨10.1371/journal.pone.0303422⟩. ⟨hal-04604525⟩
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