Towards a regional high-resolution bathymetry of the North West Shelf of Australia based on Sentinel-2 satellite images, 3D seismic surveys, and historical datasets
<p>High-resolution bathymetry forms critical datasets for marine geoscientists. It can be used to characterize the seafloor and its marine habitats, to understand past sedimentary records, and even to support the development of offshore engineering projects. Most methods to acquire bathymetry...
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| Autores principales: | , , , |
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| Formato: | article |
| Lenguaje: | EN |
| Publicado: |
Copernicus Publications
2021
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| Materias: | |
| Acceso en línea: | https://doaj.org/article/e359a670f04c4f6d87d41a44583a1b83 |
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| Sumario: | <p>High-resolution bathymetry forms critical datasets for marine geoscientists.
It can be used to characterize the seafloor and its marine habitats, to
understand past sedimentary records, and even to support the development of
offshore engineering projects. Most methods to acquire bathymetry data are
costly and can only be practically deployed in relatively small areas. It is
therefore critical to develop cost-effective and advanced techniques to
produce regional-scale bathymetry datasets.</p>
<p>This paper presents an integrated workflow that builds on satellites images
and 3D seismic surveys, integrated with historical depth soundings, to
generate regional high-resolution digital elevation models (DEMs). The
method was applied to the southern half of Australia's North West Shelf and
led to the creation of new high-resolution bathymetry grids, with a
resolution of 10 <span class="inline-formula">×</span> 10 m in nearshore areas and 30 <span class="inline-formula">×</span> 30 m elsewhere.</p>
<p>The vertical and spatial accuracy of the datasets have been assessed using
open-source Laser Airborne Depth Sounder (LADS) and multibeam echosounder
(MBES) surveys as a reference. The comparison of the datasets indicates that
the seismic-derived bathymetry has a vertical accuracy better than 1 m <span class="inline-formula">+</span> 2 % of the absolute water depth, while the satellite-derived bathymetry
has a depth accuracy better than 1 m <span class="inline-formula">+</span> 5 % of the absolute water depth.
This 30 <span class="inline-formula">×</span> 30 m dataset constitutes a significant improvement of the
pre-existing regional 250 <span class="inline-formula">×</span> 250 m grid and will support the onset of
research projects on coastal morphologies, marine habitats, archaeology, and
sedimentology.</p>
<p>All source datasets are publicly available, and the methods are fully
integrated into Python scripts, making them readily applicable elsewhere in
Australia and around the world. The regional digital elevation model and the
underlying datasets can be accessed at <a href="https://doi.org/10.26186/144600">https://doi.org/10.26186/144600</a> (Lebrec et al., 2021).</p> |
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