Chapter
Apr 26, 2012
Measuring Discharge with ADCPs: Inferences from Synthetic Velocity Profiles
Authors: Chris R. Rehmann [email protected], David S. Mueller [email protected], and Kevin A. Oberg [email protected]Author Affiliations
Publication: World Environmental and Water Resources Congress 2009: Great Rivers
Abstract
Synthetic velocity profiles are used to determine guidelines for sampling discharge with acoustic Doppler current profilers (ADCPs). The analysis allows the effects of instrument characteristics, sampling parameters, and properties of the flow to be studied systematically. For mid-section measurements, the averaging time required for a single profile measurement always exceeded the 40 s usually recommended for velocity measurements, and it increased with increasing sample interval and increasing time scale of the large eddies. Similarly, simulations of transect measurements show that discharge error decreases as the number of large eddies sampled increases. The simulations allow sampling criteria that account for the physics of the flow to be developed.
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Copyright
© 2009 American Society of Civil Engineers.
History
Published online: Apr 26, 2012
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ASCE Technical Topics:
- Acoustics
- Coastal engineering
- Coastal processes
- Coasts, oceans, ports, and waterways engineering
- Detection methods
- Doppler systems
- Eddy (fluid dynamics)
- Engineering fundamentals
- Equipment and machinery
- Errors (statistics)
- Flow (fluid dynamics)
- Fluid dynamics
- Fluid mechanics
- Fluid velocity
- Hydrologic engineering
- Mathematics
- Measurement (by type)
- Measuring instruments
- Methodology (by type)
- Ocean currents
- Parameters (statistics)
- Statistics
- Velocity profile
- Water and water resources
- Water discharge measurement
Authors
Affiliations
Department of Civil, Construction, and Environmental Engineering, Iowa State University, 374 Town Engineering Building, Ames, IA 50011. E-mail: [email protected]
U.S. Geological Survey, Office of Surface Water, 9818 Bluegrass Parkway, Louisville, KY 40299. E-mail: [email protected]
U.S. Geological Survey, Office of Surface Water, 1201 W. University Ave., Suite 100, Urbana, IL 61801-2748. E-mail: [email protected]
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