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Image Number D561-1

Technician Glenn Gray (left) adjusts the acoustic sensor while hydraulic engineer Roger Kuhnle prepares to collect data on the model stream channel at the National Sedimentation Laboratory. This experiment uses acoustic technology to map changes in sand dunes on the bottom of the channel and measure the concentration of sediment suspended in the water.

Photo by Peggy Greb.

640 pixels wide: (d561-1.jpg)

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