| Abstract: | The measurement of unsteady or tidally affected flow has been a problem faced by hydrologists for many years. Dynamic discharge conditions impose an unreasonably short time constraint on conventional current-meter discharge-measurement methods, which typically last a minimum of 1 hour. Tidally affected discharge can change more than 100 percent during a 10-minute period. Over the years, the U.S. Geological Survey (USGS) has developed moving-boat discharge-measurement techniques that are much faster but less accurate than conventional methods. For a bibliography of conventional moving-boat publications, see Simpson and Oltmann (1993, page 17). The advent of the acoustic Doppler current profiler (ADCP) made possible the development of a discharge-measurement system capable of more accurately measuring unsteady or tidally affected flow. In most cases, an ADCP discharge-measurement system is dramatically faster than conventional discharge-measurement systems, and has comparable or better accuracy. In many cases, an ADCP discharge-measurement system is the only choice for use at a particular measurement site. ADCP systems are not yet ?turnkey;? they are still under development, and for proper operation, require a significant amount of operator training. Not only must the operator have a rudimentary knowledge of acoustic physics, but also a working knowledge of ADCP operation, the manufacturer‘s discharge-measurement software, and boating techniques and safety. |
| Genre: | USGS Numbered Series |
| ProdID: | 31458 |
| Citation Author: | Simpson, Michael R. |
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| Citation Language: | ENGLISH |
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| Citation Phsyical Description: | 123 p. |
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| Citation Series: | Open-File Report |
| Citation Series Code: | OFR |
| Citation Series Number: | 2001-1 |
| Citation Search Results Text: | Discharge measurements using a broad-band acoustic Doppler current profiler; 2002; OFR; 2001-1; Simpson, Michael R. |
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| Citation Year: | 2002 |
| Type: | citation/reference |
| Text: | Discharge measurements using a broad-band acoustic Doppler current profiler; 2002; OFR; 2001-1; Simpson, Michael R. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/usgs_thumb.jpg |
| URL (INDEX PAGE): | http://pubs.water.usgs.gov/ofr0101 |
| Date Other: | Fri, 1 Mar 2002 00:00 -0600 |
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