Physics – Geophysics
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006georl..3323616g&link_type=abstract
Geophysical Research Letters, Volume 33, Issue 23, CiteID L23616
Physics
Geophysics
5
Marine Geology And Geophysics: Seafloor Morphology, Geology, And Geophysics, Marine Geology And Geophysics: Submergence Instruments: Rov, Auv, Submersibles, Oceanography: General: Coral Reef Systems (4916), Oceanography: General: Diurnal, Seasonal, And Annual Cycles (0438), Oceanography: Physical: Currents
Scientific paper
To make progress in understanding the distribution and genesis of coral mounds in cold and dark water, maps of morphology and oceanographic conditions resolving features at the 1-10 m scale are needed. An autonomous underwater vehicle (AUV) cruising 40 m above the seafloor surveyed a 48 km2 coral mound field in 600-800 m water depth at the base of slope of Great Bahama Bank. The AUV acquired 1-3 meter resolution acoustic backscatter and bathymetry together with current vectors, salinity, and temperature. The multibeam bathymetry resolved more than 200 coral mounds reaching up to 90 m height. Mound morphology is surprisingly diverse and mound distribution follows E-W oriented off-bank ridges. Bottom currents reverse every 6 hours indicating tidal flow decoupled from the north flowing surface current. The AUV data fill the gap between low-resolution surface-based mapping and visual observations on the seafloor, revealing the dynamic environment and spatial relationships of an entire coral mound field.
Correa Thiago
Eberli Gregor P.
Grasmueck Mark
Luo Jiangang
Rathwell Glenda
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