| Abstract: | Use of an ultrasonic velocity meter to determine discharge in open channels involves measuring the velocity in a line between transducers in the stream and relating that velocity to the average velocity in the stream. The standard method of calculating average velocity in the channel assumes that the velocity profile in the channel can be represented by the one-dimensional von Karman universal velocity profile. However, the velocity profile can be described by a two-dimensional equation that accounts for the horizontal velocity variations induced by the channel sides.
An equation to calculate average velocity accounts for the two-dimensional variations in velocity within a stream. The use of this new equation to calculate average velocity was compared to the standard method in theoretical trapezoidal cross sections and in the L-31N and Snapper Creek Extension Canals near Miami, Florida. These comparisons indicate that the two-dimensional variations have the most significant effect in narrow, deep channels. Also, the two-dimensional effects may be significant in some field situations and need to be considered when determining average velocity and discharge with an ultrasonic velocity meter. |
| Genre: | USGS Numbered Series |
| ProdID: | 30038 |
| Citation Author: | Swain, E. D. |
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| Citation Language: | ENGLISH |
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| Citation Phsyical Description: | v, 15 p. :ill. ;28 cm. |
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| Citation Publisher: | U.S. Geological Survey ;
Books and Open-File Reports [distributor], |
| Citation Series: | Water-Resources Investigations Report |
| Citation Series Code: | WRI |
| Citation Series Number: | 91-4200 |
| Citation Search Results Text: | Effects of horizontal velocity variations on ultrasonic velocity measurements in open channels; 1992; WRI; 91-4200; Swain, E. D. |
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| Citation Year: | 1992 |
| Type: | citation/reference |
| Text: | Effects of horizontal velocity variations on ultrasonic velocity measurements in open channels; 1992; WRI; 91-4200; Swain, E. D. |
| URL (THUMBNAIL): | http://pubs.usgs.gov/wri/1991/4200/report-thumb.jpg |
| URL (INDEX PAGE): | http://sofia.usgs.gov/publications/wri/91-4200/ |
| URL (DOCUMENT): | http://pubs.usgs.gov/wri/1991/4200/report.pdf |
| Date Other: | Sat, 1 Jan 1994 00:00 -0600 |
| Publisher: | U.S. Geological Survey ;
Books and Open-File Reports [distributor], |
