11. The epithet " Thumb Lake " derives from the lake's bathymetry . 12. Submarine elevation ( known as bathymetry ) data is generated using ship-mounted depth soundings. 13. Starting in the early 1930s, single-beam sounders were used to make bathymetry maps. 14. As tides interact with varying bathymetry and wind mixes with surface water, internal waves are created. 15. This mapping system has the ability to record both bathymetry and sidescan data at the same time. 16. As discussed by Amos and Beaman, the bathymetry of the Zenith Plateau is very poorly mapped. 17. The new data that had been collected on the ocean basins also showed particular characteristics regarding the bathymetry . 18. "' Bathymetry "'is the study of underwater depth of lake or ocean floors. 19. It also has transducers for measuring ocean currents, sub-bottom profiling, and deep water bathymetry . 20. Map of Akaroa Harbour showing a fining of sediments with increased bathymetry toward the central axis of the harbour.