| Titre | Using AUV for sediment mapping - experiences from a MAREANO pilot project, Norway |
| Télécharger | Téléchargement (publication entière) |
| Auteur | Thorsnes, T; Bjarnadottír, L; Jakobsen, F; Bellec, V; Dloan, M; Lågstad, P; Olsen, K T |
| Source | Program and abstracts: 2017 GeoHab Conference, Dartmouth, Nova Scotia, Canada; par Todd, B J; Brown, C J; Lacharité, M; Gazzola, V; McCormack, E; Commission géologique du Canada, Dossier public 8295,
2017 p. 114, https://doi.org/10.4095/305935 (Accès ouvert) |
| Liens | GeoHab 2017
|
| Année | 2017 |
| Éditeur | Ressources naturelles Canada |
| Réunion | 2017 GeoHab: Marine Geological and Biological Habitat Mapping; Dartmouth, NS; CA; mai 1-4, 2017 |
| Document | dossier public |
| Lang. | anglais |
| DOI | https://doi.org/10.4095/305935 |
| Media | en ligne; numérique |
| Référence reliée | Cette publication est contenue dans Todd, B J;
Brown, C J; Lacharité, M; Gazzola, V; McCormack, E; (2017). Program and abstracts: 2017 GeoHab Conference, Dartmouth, Nova Scotia, Canada, Commission géologique du Canada, Dossier public 8295 |
| Formats | pdf |
| Lat/Long OENS | 2.5000 18.0000 70.0000 67.0000 |
| Sujets | techniques de cartographie; océanographie; milieux marins; études côtières; conservation; organismes marins; écologie marine; gestion des ressources; peuplements biologiques; etudes de l'environnement;
écosystèmes; biotopes; sédiments marins; repartition granulométrique; marges continentales; plate-forme continentale; talus continental; levés géophysiques; levés acoustiques marins; levés au sonar; sonar latéral; photographie; échantillons prélevés
au hasard; bathymétrie; topographie du fond océanique; récifs; Coraux; biologie; géologie marine; géologie des dépôts meubles/géomorphologie; géologie de l'environnement; géophysique |
| Programme | Géoscience de la gestion des océans, Géoscience en mer |
| Diffusé | 2017 09 26 |
| Résumé | (disponible en anglais seulement)
Sediment grain-size maps are an important product in their own right and a key input for habitat and biotope maps. National and regional mapping programmes are
tasked with mapping large areas, and survey efficiency, data quality, and resulting map confidence are important considerations when selecting the mapping strategy. Since 2005, c. 175,000 square kilometres of the Norwegian continental shelf and
continental slope has been mapped with respect to sediments, habitats and biodiversity, and pollution under the MAREANO programme (www.mareano.no). At present the sediment mapping is based on a combination of ship-borne multibeam bathymetry and
backscatter, visual documentation using a towed video platform, and grab sampling.
We have now tested a new approach, using an Autonomous Underwater Vehicle (AUV) as the survey platform for the collection of acoustic data (Synthetic Aperture
Sonar (SAS), EM2040 bathymetry and backscatter) and visual data (still images using a TFish colour photo system). This pilot project was conducted together the Norwegian Hydrographic Service, the Institute of Marine Research (biology observations)
and the Norwegian Defence Research Establishment (operation of ship and AUV).
The test site reported here is the Vesterdjupet area, offshore Lofoten, northern Norway. The water depth is between 170 and 300 metres, with sediments ranging from
gravel, cobbles and boulders to sandy mud. A cold-water coral reef, associated with bioclastic sediments was also present in the study area.
The presentation will give an overview of the main findings and experiences gained from this pilot
project with a focus on geological mapping and will also discuss the relevance of AUV-based mapping to large-area mapping programmes like MAREANO. |
| GEOSCAN ID | 305935 |
|
|