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Physical Sciences and Mathematics Commons™
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Full-Text Articles in Physical Sciences and Mathematics
Seamless Online Distribution Of Amundsen Multibeam Data, James Muggah, Ian Church, Jonathan Beaudoin, John E. Hughes Clarke
Seamless Online Distribution Of Amundsen Multibeam Data, James Muggah, Ian Church, Jonathan Beaudoin, John E. Hughes Clarke
Center for Coastal and Ocean Mapping
Since 2003, all underway multibeam and sub-bottom data from the Canadian Coast Guard Ship Amundsen has been posted online within approximately six months of the end of each cruise. A custom interface allowing the user to access 15' latitude by 30' longitude mapsheets was implemented in 2006, allowing the user to download the bathymetric and backscatter data at 10 metre resolution. While this interface matched the underlying data management scheme implemented at the University of New Brunswick, the zoom and pan capability was at a fixed scale with limited contextual data. In the past few years, with the introduction of …
Modeling The Effect Of Oceanic Internal Waves On The Accuracy Of Multibeam Echosounders, Travis Hamilton, Jonathan Beaudoin
Modeling The Effect Of Oceanic Internal Waves On The Accuracy Of Multibeam Echosounders, Travis Hamilton, Jonathan Beaudoin
Center for Coastal and Ocean Mapping
When ray bending corrections are applied to multibeam echosounder (MBES) data, it is assumed that the varying layers of sound speed lie along horizontally stratified planes. In many areas internal waves occur at the interface where the water’s density changes abruptly (a pycnocline), this density gradient is often associated with a strong gradient in sound speed (a velocline). The internal wave introduces uncertainty into the echo soundings through two mechanisms: (1) tilting of the velocline, and (2) vertical oscillation of the velocline’s depth. A model has been constructed in order to examine how these effects degrade the accuracy of MBES …