9455

• UCREFRP Catalog Number: 9455
• Author: Lyons, J. K., M. J. Pucherelli and R. C. Clark.
• Title: Sediment Transport and Channel Characteristics of a Sand-Bed portion of the Green River Below Flaming Gorge Dam, Utah, U.S.A.
• USFW Year: 1992.
• USFW - Doc Type: R-92-08,
• Copyright Material: NO

RESULTS
Trends in Channel Width
Analysis of aerial photography acquired between 1952 and 1964 revealed little change in
average channel width for reach 1. The total channel surface area of the river segments studied
increased from about 989 hectares in 1952 to 1003 hectares in 1964, or only 1.4 percent
(table 2). Channel surface area change among the alluvial and confined sites ranged from a
slight loss of 1.5 percent to a slight gain of 2.4 percent. The average channel width for reach 1
increased by only 1.6 percent from 210 meters in 1952 to 213 meters in 1964.
Table 2. - Green River reach 1 channel
morphology comparisons between 1952
and 1964 for alluvial and confined
segments.
Site 1952 1964
161 km -193 km
(alluvial)
area (ha) 664.64 680.32
width (m) 207 211
193 km -140 km
(confined)
area 137.15 138.63
width 229 232
269 km - 279 km
(alluvial)
area 187.31 184.45
width 210 206
Total alluvial
area 851.95 864.77
width 207 210
Total reach
area 989.11 1003.39
width 210 213
Note: Site descriptions are distances
downstream from Flaming Gorge Dam. This
analysis does not cover the entirety of
reach 1.
Table 3 presents the reach 1 channel surface area and width for 1964, 1974, 1978, and 1986.
The largest changes in channel surface area and width occurred between 1964 and 1974.
Channel surface area decreased 6 percent from about 2,412 to 2,268 hectares, ranging from
-2.6 percent for the reach between 160 kilometers and 179 kilometers below Flaming Gorge
Dam (alluvial) to -12 percent for the segment between 138 kilometers and 156 kilometers below
the dam (alluvial). Average channel width for reach 1 decreased from 217 meters in 1964 to
204 meters in 1974.
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