RIVER ICE INFLUENCES ON FORT PECK REACH, MISSOURI RIVER
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ground-penetrating radar was found to be unsuitable for measuring channel
bathymetry at the sites, because the salinity (conductivity) level of the river water
was sufficiently high to dissipate the radar's signal. The microwave radar used
during the January survey characterized the ice along the cross section as rela-
tively uniform in thickness. Flow velocities were measured using a two-
component electromagnetic velocity probe attached to a shaft that was extended
by incrementally adding 3.3-ft sections.
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