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A field experiment was conducted on May 7-8, 2002 using a CODAR RiverSonde UHF radar system at Vernalis, California on the San Joaquin River. The monostatic radar configuration on one bank of the river, with the antennas looking both upriver and downriver, provided very high-quality data. Estimates of both along-river and cross-river surface current were generated using several models, including one based on normal-mode analysis. Along-river surface velocities ranged from about 0.6 m/s at the river banks to about 1.0 m/s near the middle of the river. Average cross-river surface velocities were 0.02 m/s or less.
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Categories: Publication;
Types: Citation;
Tags: Acoustic measurements,
Acoustic propagation,
Geologic measurements,
Geology,
Rivers, All tags...
Sea measurements,
Sea surface,
UHF measurements,
Ultrasonic variables measurement,
Velocity measurement, Fewer tags
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Long-term, non-contact river velocity measurements have been made using a UHF RiverSonde system for several months at each of two locations having quite different flow characteristics. Observations were made on the Cowlitz River at Castle Rock, Washington from October 2003 to June 2004, where the unidirectional flow of the river ranged from about 1.0 to 3.5 m/s. The radar velocity was highly correlated with the stage height which was continually measured by the U. S. Geological Survey. The profile of the along-channel velocity across the water channel also compared favorably with in-situ measurements performed by the Survey. The RiverSonde was moved to Threemile Slough, in central California, in September 2004 and...
Categories: Publication;
Types: Citation;
Tags: 0.8 m/s,
1 to 3.5 m/s,
AD 2003 10 to 2004 06,
AD 2004 09,
California, All tags...
Castle Rock,
Cowlitz River,
Frequency,
Geologic measurements,
Geology,
Radar antennas,
Radar measurements,
Radar scattering,
Rivers,
Sacramento River,
San Joaquin River,
Sea measurements,
Threemile Slough,
UHF RiverSonde river velocity observation,
US Geological Survey,
Velocity measurement,
Washington,
Yagi-Uda antennas,
acoustic measurement,
along-channel velocity,
data acquisition,
flow characteristics,
hydrological equipment,
hydrological techniques,
noncontact river velocity measurements,
radar velocity,
remote sensing by radar,
tidal effects,
ultrasonic velocity meter,
unidirectional flow,
water channel,
water level,
water velocity, Fewer tags
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Two-dimensional river flow patterns have been measured using a pair of RiverSondes in two experiments in the Sacramento-San Joaquin River Delta system of central California during April and October 2007. An experiment was conducted at Walnut Grove, California in order to explore the use of dual RiverSondes to measure flow patterns at a location which is important in the study of juvenile fish migration. The data available during the first experiment were limited by low wind, so a second experiment was conducted at Threemile Slough where wind conditions and surface turbulence historically have resulted in abundant data. Both experiments included ADCP near-surface velocity measurements from either manned or unmanned...
Categories: Publication;
Types: Citation;
Tags: 2D river flow patterns,
AD 2007 04 23 to 25,
AD 2007 10 10 to 11,
ADCP near-surface velocity measurements,
Acoustic Doppler Current Profiling, All tags...
Boats,
Current measurement,
Doppler measurement,
Fluid flow measurement,
Geologic measurements,
Geology,
Rivers,
Sacramento-San Joaquin River Delta system,
Sea measurements,
Surface waves,
Threemile Slough,
UHF measurements,
UHF radar,
USA,
Velocity measurement,
Walnut Grove,
Walnut Grove experiment,
acoustic equipment,
autonomous survey vessels,
central California,
dual-RiverSonde measurements,
hydrological techniques,
juvenile fish migration,
remote sensing by radar,
root mean square differences,
surface turbulence,
tidal effects,
wind conditions, Fewer tags
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Two RiverSondes were operated simultaneously in close proximity in order to provide a two-dimensional map of river surface velocity. The initial test was carried out at Threemile Slough in central California. The two radars were installed about 135 m apart on the same bank of the channel. Each radar used a 3-yagi antenna array and determined signal directions using direction finding. The slough is approximately 200 m wide, and each radar processed data out to about 300 m, with a range resolution of 15 m and an angular resolution of 1 degree. Overlapping radial vector data from the two radars were combined to produce total current vectors at a grid spacing of 10 m, with updates every 5 minutes. The river flow in...
Categories: Publication;
Types: Citation;
Tags: 2D surface river flow pattern,
3-yagi antenna array,
Antenna measurements,
Directive antennas,
Fluid flow measurement, All tags...
Geologic measurements,
Radar antennas,
Rivers,
Sacramento River,
Sea measurements,
Sea surface,
Signal resolution,
Threemile Slough,
Velocity measurement,
antenna arrays,
central California,
direction finding,
flow reversal,
juvenile fish migration,
overlapping radial vector data,
paired RiverSondes,
radar signal processing,
remote sensing by radar,
river surface velocity, Fewer tags
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