Blending single beam RoxAnn and multi-beam swathe QTC hydro-acoustic discrimination techniques for the Stonehaven area,Scotland, UK |
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| Authors: | Natalia Serpetti Mike Heath Eric Armstrong Ursula Witte |
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| Institution: | 1. Department of Ecosystem Studies, Royal Netherlands Institute for Sea Research NIOZ-Yerseke, Korringaweg 7, 4401CT Yerseke, The Netherlands;2. Faculty of Geosciences, Utrecht University, Budapestlaan 4, 3584 CD Utrecht, The Netherlands;1. Institut de Recerca de la Biodiversitat, Departament de Biologia Animal, Universitat de Barcelona, Avinguda Diagonal 643, 08028 Barcelona, Spain;2. IRTA, Aqüicultura, Cultius Aquàtics, 43540 Sant Carles de la Ràpita, Tarragona, Spain;3. c/Nou 8, 43839 Creixell, Tarragona, Spain;1. Agrocampus Ouest, UMR 985 ESE Ecologie et santé des écosystèmes, F-35042 Rennes, France;2. Ifremer, EMH, rue de l''île d''Yeu, BP 21105, 44311 Nantes Cedex 03, France;3. Ifremer, LRH-LR, Place Gaby Coll, 17137 L''Houmeau, France |
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| Abstract: | Surface properties of the seabed in a 180 km2 area of coastal waters (14–57 m depth) off northeast Scotland were mapped by hydro-acoustic discrimination using single and multi-beam echosounders linked to signal processing systems (RoxAnn for the single beam, and Questor Tangent Corporation (QTC) Multiview for the multibeam). Subsequently, two ground truthing surveys were carried out, using grab and TV sampling. The RoxAnn and QTC-Multiview outputs showed strong similarity in their classifications of seabed types. Classifications generated by QTC-Multiview were used to supervise those based on seabed roughness and hardness indices produced by the RoxAnn system and thereby develop a ‘blended’ map based on both systems. The resulting hydro-acoustic classes agreed well with a cluster analysis of data on sediment grain sizes from the grab sampling, and indicated that the area could be described by distinct regions of surface texture and surficial sediments ranging from muddy sand to boulders and rock. |
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