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UHF RiverSonde observations of water surface velocity at Threemile Slough, California

By:
, , , ,
DOI: 10.1109/IGARSS.2005.1525890

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Abstract

A UHF RiverSonde system, operating near 350 MHz, has been in operation at Threemile Slough in central California, USA since September 2004. The water in the slough is dominated by tidal effects, with flow reversals four times a day and a peak velocity of about 0.8 m/s in each direction. Water level and water velocity are continually measured by the U. S. Geological Survey at the experiment site. The velocity is measured every 15 minutes by an ultrasonic velocity meter (UVM) which determines the water velocity from two-way acoustic propagation time-difference measurements made across the channel. The RiverSonde also measures surface velocity every 15 minutes using radar resonant backscatter techniques. Velocity and water level data are retrieved through a radio data link and a wideband internet connection. Over a period of several months, the radar-derived mean surface velocity has been very highly correlated with the UVM index velocity several meters below the surface, with a coefficient of determination R2 of 0.976 and an RMS difference of less than 10 cm/s. The wind has a small but measurable effect on the velocities measured by both instruments. In addition to the mean surface velocity across the channel, the RiverSonde system provides an estimate of the cross-channel variation of the surface velocity. ?? 2005 IEEE.

Additional Publication Details

Publication type:
Conference Paper
Publication Subtype:
Conference Paper
Title:
UHF RiverSonde observations of water surface velocity at Threemile Slough, California
ISBN:
0780390504; 9780780390508
DOI:
10.1109/IGARSS.2005.1525890
Volume
6
Year Published:
2005
Language:
English
Larger Work Title:
International Geoscience and Remote Sensing Symposium (IGARSS)
First page:
4383
Last page:
4386
Number of Pages:
4
Conference Title:
2005 IEEE International Geoscience and Remote Sensing Symposium, IGARSS 2005
Conference Location:
Seoul
Conference Date:
25 July 2005 through 29 July 2005