NOAA Commissions Research Ship Bell M. Shimada01/09/2010 |
| US Federal officials have commissioned NOAA Ship Bell M. Shimada, a research vessel that will study a wide range of marine life and ocean conditions along the West Coast. This ship will enable researchers to collect data on sea life and habitats with a higher accuracy than before. Bell M. Shimada's design allows for quieter operation and movement of the vessel through the water, giving scientists the ability to study fish and marine mammals without significantly altering their behaviour. |
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Hydrographic Survey of Riverbed Erosion |
Members of the US Geological Survey were filmed while out on the Missouri River at Williston, North Dakota, USA, performing a hydrographic survey to monitor the state of riverbed erosion. They were using a multibeam echo sounder which transmits sound energy and analyses the return signal (echo) that has bounced off the riverbed or other objects. Multibeam sonars emit sound waves from directly beneath a ship's hull to produce fan-shaped coverage of the riverbed.
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