• Using sound waves to determine water depth
  • Measuring time difference between sending and receiving of the sound wave
  • When sound velocity is accurately known; water depth can be determined

… same as for single-beam echosounding/echolod

 

  • Biggest advantage of MULTIBEAM mapping is TIME-COST efficiency
  • Depth values and positions are corrected (CTD sound velocity profiles; motion sensor; GPS)

SEABEAM 1050: 50 kHZ; 120 degrees swath angle; 1.5 by 1.5 degrees beam angle; 108 beams

Footprint or depth measurement = 1.5 m by 1.5 m at 50 m water depth
  37 m by 37 m at 1500 m water depth