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SL20

About

About SL20

SL20 is OceanAlpha’s compact surface vessel for bathymetric survey and water-discharge measurement in rivers, lakes, canals and sheltered coastal water. Its carbon-fibre hull measures 1.05 by 0.55 by 0.38 metres, weighs 17 kilograms with battery and draws 15 centimetres. A debris-resistant waterjet propulsion system reaches 8 knots, while endurance is six hours at a 3-knot survey speed.

One operator can transport, launch and recover the vessel and supervise it by handheld radio or autonomous mission software. The remote-control link reaches 1 kilometre and telemetry reaches 2 kilometres. A 177-millimetre moon pool and custom brackets accept echo sounders, ADCPs, RTK GNSS and water-quality instruments. SL20 has completed autonomous bathymetric work at a Polish dock and on three Tibetan glacial lakes, including high-altitude sites that conventional survey boats could not readily reach.

Timeline

  • Echogram deploys SL20 for Polish dock survey

    2021-09-01 - Deployment - The survey team planned a lattice route and supervised SL20 from a mobile command station. A single-beam echo sounder and RTK GNSS supplied live depth and position data. SL20 surveyed close to and beneath piers that were inaccessible to conventional manned boats.

    Source
  • SL20 surveys three Tibetan glacial lakes

    2018-10-11 - Deployment - The expedition included OceanAlpha, the Qinghai-Tibet Plateau Institute of the Chinese Academy of Sciences and the University of Zurich. SL20 surveyed Qihu Lake, Jialong Cuo Lake and Galong Cuo Lake at altitudes up to 5,070 m. The largest individual survey covered 5 km² at Galong Cuo Lake.

    Source

Context

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