Name: Backscatter - Pelorus South 2020

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Description: The data were collected from 12 November 2019 to 6 July 2020 from LINZ HS66 Hydrographic Survey. This survey was conducted by two contractors:iXBlue using a Kongsberg EM2040 Mk II multibeam echo sounder from 12 November 2019 to 10 February 2020. Discovery Marine Ltd (DML) using a Teledyne RESON SeaBat T 50 R multibeam echo sounder from 15 November 2019 to 6 July 2020. In 2019, Marlborough District Council (MDC), in collaboration with LINZ, contracted iXBlue and DML to collect Multibeam Echo Sounding (MBES) data across 325 km2 of seafloor within the Western Marlborough Sounds (identified as survey HS66) that included Pelorus Sounds/ Te Hoiere (blocks: north and south Pelorus and Popoure Reach), Te Aumiti/French Pass and Admiralty Bay. The HS66 survey used two MBES systems, following the methods used in the HS51 survey of Queen Charlotte Sound/ Totaranui, to provide consistency between survey areas. The iXblue survey used a Kongsberg 2040, while the DML survey used a Reson SeaBat T50 multibeam echo sounder system to map their respective areas of the western Marlborough Sounds (HS66 survey area). To minimise changes of acoustic energy transmitted, both surveys used the same “controlled frequency (300 kHz) and pulse length”, enabling “consistent backscatter response to the seafloor and water column across all depths” (Mackay et al. 2020). During the HS66 surveys a series of sediment grabs were collected across the survey area (31 by iXblue and 16 by DML) to provided ground truthing information. A section of seafloor in Waitata Bay (termed ‘Waitata Bay reference surface’ in Mackay et al. 2020) was resurveyed at multiple times over the duration of the survey to enable calibration of the MBES survey data (iXblue and DBL reports, 2020).

Service Item Id: ac44e1f3704e4bb58da446cacd03c8a8

Copyright Text: National Institute of Water and Atmospheric Research

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