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Disturbances Caused by Probes That Penetrate Through the Water Surface of an Open Channel Flow

Author(s): Naomi Sanders; Ralph Budwig; Elowyn Yager

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Abstract: Many open channel measurement applications require the use of a probe that penetrates the water surface of the flow. A probe deployed in this manner will create an adjacent region of disturbed flow. For example, an ADCP transducer that is located just below the water surface will propagate disturbances into the flow. In the present application, an ultrasonic transducer is submerged through the water surface in order to measure changes in the sediment bed. The research question being considered is whether or not the flow disturbances from the transducer modify the sediment bed's natural development. Experimental and numerical approaches are being used to investigate the flow disturbance in the water column downstream of a transducer model. PIV measurements are being conducted for a physical model of the transducer mounted in a flume. The overall pattern of the disturbance and location of maximum disturbance have been determined.

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Year: 2009

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