Ultrasonic velocity meter used in stream gaging

Edited by: Shane Richard M.


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Many streams and canals in Florida are affected by tides or control structures and experience very low flow velocities at times. For example, the St. Johns River in northeastern Florida is affected by tides for about 140 miles upstream from its mouth and many canals in the Miami area of southeastern Florida are controlled by manmade structures and other elements that cause a variable backwater effect and very low flow velocities. For these conditions, it becomes necessary to obtain a continuous index of mean velocity as well as stage in order to compute discharge. Point-velocity sensing systems have been used to relate point velocity to mean velocity but their usefulness commonly is limited because of the lack of an exact relation. The ultrasonic velocity meter (UVM) provides an alternative approach to measuring a velocity index that can be related to mean velocity; one that provides an integrated velocity at a prescribed elevation across a stream. Six stations in the tidal-affected lower St. Johns River basin are presently equipped with UVM's. Measuring sections are as narrow as 100 feet and as wide as 900 feet. Multiple acoustic paths are used to measure wide sections in a straight reach of river; crossing paths are used to measure sections in a bend of the river. Because of low velocity and variable backwater conditions, flow also is measured with UVM's in 11 canals in the Miami area that drain into The Everglades. At some of the canal sites transducers have been permanently mounted and a 'portable' UVM module is used to obtain instantaneous velocity readings.

Additional publication details

Publication type Conference Paper
Publication Subtype Conference Paper
Title Ultrasonic velocity meter used in stream gaging
ISBN 0872628167
Year Published 1991
Language English
Publisher Publ by ASCE
Publisher location New York, NY, United States
Larger Work Title Proceedings - National Conference on Hydraulic Engineering
First page 763
Last page 768
Conference Title Proceedings of the 1991 National Conference on Hydraulic Engineering
Conference Location Nashville, TN, USA
Conference Date 29 July 1991 through 2 August 1991