7052

• UCREFRP Catalog Number: 7052
• Author: Andrews, E. D. and J. M. Nelson
• Title: Topographic Response of a Bar in the Green River, Utah to Variation in Discharge
• USFW Year: 1989
• USFW - Doc Type: American Geophysical Union
• Copyright Material: YES

480

Topographic Response of a Bar

DISTANCE FROM CENTERLINE [M]
0.0

-1250

125.0
U.O
1.0
2.0
3.0
4.0
5.0
6.0

00
1.0
2.0
3.0
4.0
5.0 16
60
125.0 0.0 -125.0
~ 0.0
"T'" 1.0
!i: 2.0
t:J 3.0
0
4.0
5.0
6.0
0.0
1.0
2.0
3.0
4.0
5.0
6.t
0.0
1.0
2.0
3.0
4.0
5.0
6.0

Fig. 8. Predicted evolution of bar topography at 5 cross sections during a discharge of 475
m3fs for 2 day~. Dashed line sbows original topography and solid line shows rmal .
topography.

slowly in the secondary channel. The bar surface erodes slowly in the vicinity of
cross section 18. Further downstream, however, erosion of the bar surface ceases,
and a significant quantity of sediment accumulates over the apex of the bar.
Model calculations using a discharge of 475 m3/s indicate that the bar
topography is enhanced appreciably by flow near the bankfull stage. Sediment
accumulates on the bar surface and is eroded from the side channels, except in the