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Region 9: Columbia-Pacific Northwest

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Testing bathymetric equipment at Coldwater Lake, Mount St. Helens...

Testing bathymetric equipment at Coldwater Lake, Mount St. Helens

Adam Mosbrucker tests equipment (Acoustic Doppler Current Profiler, survey-grade RTK-GPS and a map-grade GPS) in preparation for a lake bottom survey.

Researchers generate a bathymetric contour map of Castle Lake, near...

A bathymetric contour map of Castle Lake, Mount St. Helens.

Researchers map the bottom of Castle Lake, near Mount St. Helens. For three days, researchers ran a small boat over the lake surface equipped with an acoustic Doppler current profiler (ADCP). The ADCP bounces an acoustic wave off the bottom that is reflected back to a mobile receiver in the boat. The frequencies of the send-receive pairs are used to calculate depth. More

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